Table 6-2 Investment Statistics of Land and Resources Survey 1999-2009 Geological Environment Survey
(1) Hydrogeological survey
1. A new round of national groundwater resources evaluation
From 2000 to 2002, on the basis of investigation and evaluation in various provinces (autonomous regions and municipalities), a new round of national investigation and evaluation of groundwater resources was completed, and the overall situation and exploitation potential of groundwater resources in China since 1984 were found out, which provided scientific basis for the planning and management of water resources in China.
The evaluation results show that the average annual groundwater resources in China are 923.5 billion m3, including 883.7 billion m3 of fresh water, 27.7 billion m3 of brackish water and 0/2/0/100 million m3 of brackish water. China has an average of 352.7 billion cubic meters of underground fresh water resources for many years. In the national groundwater resources, according to the area statistics, 63% of groundwater resources can be directly drunk, 12% is not suitable for drinking but can be used as industrial and agricultural water supply sources, and about 8% of groundwater resources can not be directly used, and can only be used after special treatment. The groundwater quality in southern China is excellent, and most of it can be directly drunk. The water quality in the northern mountainous area and piedmont plain is better, the central plain is worse and the coastal area is the worst. There are endemic areas related to drinking water quality in different provinces (autonomous regions and municipalities), especially in some areas of northern hilly areas where there are high fluorine water, high arsenic water, low iodine water and high iron manganese water.
2. Hydrogeological investigation of major plains and basins in the north.
Focusing on the main plains and basins in northern China, the investigation and evaluation of groundwater resources and its environmental problems were carried out. It mainly includes Tarim Basin, Qaidam Basin, Junggar Basin, Hexi Corridor, Yinchuan Plain and Ordos Basin in the northwest, Sanjiang Plain, Songnen Plain and Xiliaohe Plain in the northeast, North China Plain and Six great basin in Shanxi. Through the hydrogeological survey of1∶ 250,000, the spatial distribution and structure of groundwater systems in main plains and basins are further clarified, and the recharge, diameter and discharge conditions of groundwater and their changing process are found out. The equilibrium method and numerical simulation method are used to evaluate groundwater resources, which provides basic data for regional economic and social development planning. The dynamic investigation and evaluation of groundwater were carried out in Songnen Plain, North China Plain, Ordos Basin, Yinchuan Plain, Hexi Corridor and Junggar Basin, and the dynamic characteristics of groundwater level, quantity and quality were comprehensively grasped, which provided decision-making basis for scientific management of aquifers and rational development and utilization of groundwater.
(1) Ordos basin. A three-dimensional geological structure model of the whole basin is established, and the spatial distribution law of Cretaceous water-bearing media is preliminarily found out, and the paleogeographic characteristics of Cretaceous lithofacies and its relationship with groundwater occurrence conditions are preliminarily found out. The application of isotope technology in groundwater exploration in Ordos has made important progress. An in-situ test site for phreatic water infiltration and evaporation was established in a typical section north of Baiyushan Mountain in Cretaceous artesian basin, and key data were obtained. The rational utilization of groundwater resources and its countermeasures are put forward. Find out the total amount of groundwater resources in the whole basin, the present situation of development and utilization and the development potential (Table 6-3). In the 18 area with relatively rich groundwater resources, there are 16 1 areas with centralized groundwater water supply sources, accounting for 38% of the total exploitable groundwater resources in the whole basin.
Table 6-3 Table of Groundwater Resources and Development Potential in Ordos Basin
Source: Xi Geological Survey Center.
(2) North China Plain. Through the research and analysis of borehole data, the lower limit of Quaternary in North China Plain is unified to 2.58Ma, which is recognized by the world. According to the lithology of sediments, the Quaternary water-bearing rock series is divided into three aquifer groups from top to bottom, and a three-dimensional geological model of groundwater in North China is initially established. According to the monitoring data of groundwater level and isotopic data, it is shown that shallow water was replenished by local precipitation and irrigation infiltration, deep groundwater in the central plain was replenished by the last glacial period, and groundwater in Tianjin coastal plain was presumably replenished by the last glacial period. The development and change characteristics of regional groundwater drop funnel are basically found out. At the same time, the shallow groundwater level in the North China Plain has dropped, and there are different sizes of groundwater level drop funnels in the urban areas where groundwater exploitation is concentrated. The more serious funnels are Shijiazhuang Funnel and Ningbailong Funnel. The deep groundwater level has dropped greatly, which makes most of the deep groundwater level in North China Plain lower than sea level. The more serious funnels are Jizhouheng Funnel, Cangzhou Funnel and Dezhou Funnel. The variation characteristics of groundwater quality in North China Plain are basically found out, and the general trend is from chloride groundwater to sulfate groundwater, and then to bicarbonate groundwater. According to the situation of groundwater resources in North China Plain (Table 6-4), the sustainable utilization strategy of water resources in North China Plain is put forward, and the groundwater function zoning in North China Plain is carried out.
(3) Qaidam Basin. Completed1:250,000 hydrogeological environmental geological survey of 65,000 Km2,1:250,000 remote sensing interpretation120,000 Km2, hydrogeological drilling 16 15.46m .. Based on more than 700 drilling data, the geological structure model of Qaidam Basin was initially established. The recharge and development of groundwater resources in this area have been preliminarily identified, and the environmental problems related to groundwater have been basically identified. According to the ecological and environmental functions of groundwater, the groundwater in the whole region is divided into three functional areas: groundwater recharge-runoff area in the Gobi area in front of the mountain, groundwater development and utilization area in the gravel area, groundwater discharge area in the fine soil area in the lake plain and underground-surface brine mineral resources area in the center of the basin.
(4) Hexi Corridor. Completed1∶ 250,000 hydrogeological supplementary survey of 38,300 Km2 and remote sensing interpretation area of 45,000 km2; There are 5 hydrogeological exploration holes with total footage1096.39 m. The hydrogeological exploration data of Hexi Corridor in recent 50 years are systematically sorted out, and the Quaternary geology, groundwater recharge and drainage conditions, groundwater dynamic law and water quality and quantity characteristics are systematically summarized and analyzed. The natural resources and the total amount of groundwater exploitation are evaluated, and the allowable amount of groundwater exploitation in the corridor plain area is determined. The hydrogeological model of Shule River basin is established.
Table 6-4 Table of Groundwater Exploitation Degree of Main Plains (Basins) in North China
Note: ① refers to the exploitation amount of pore water; ② Including brackish water.
Source: Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences.
3. Hydrogeology and Environmental Geology Investigation in Karst Mountainous Areas in Southwest China.
Karst rocky mountain areas in southwest China include Yunnan, Guizhou, Guangxi, Hunan, Sichuan, Chongqing, Hubei and Guangdong, with a karst area of 780,000 square kilometers. The focus of the work is to carry out a1∶ 50,000 comprehensive survey of hydrogeology, environment and geology, grasp the situation of karst drought, flood and rocky desertification, put forward the development project scheme of karst water in the basin, select typical karst water sources to carry out the demonstration of groundwater development and comprehensive management of ecological environment, and provide basic geological data and countermeasures for solving drought and water shortage in southern karst areas and promoting comprehensive management of rocky desertification. Completed1:250,000 hydrogeology survey, 89654.38+0.000 Km2,1:50,000 hydrogeology comprehensive survey, 1.23 million Km2 and 255,000 m hydrogeology drilling.
Through investigation, the water resources and their development and utilization potential in karst areas in southwest China are found out. The natural groundwater resource is1762.82 million m3/a, the allowable exploitation of karst water is 615.7 million m3/a, and the groundwater resource potential is 517.38 million m3/a. There are 2,863 underground rivers in the area, and the exploited underground rivers are1380. Underground rivers have great potential for development and utilization. The distribution and development trend of karst rocky desertification are found out. Rocky desertification area 1 13500 Km2, accounting for 22.7% of the karst area, with an average annual growth rate of 1.86%. Karst rocky desertification is deteriorating. Taking different types of karst areas as units, the hydrogeological and environmental geological survey of1∶ 50,000 was carried out, the karst drought, flood and geological disasters were mastered, and the karst water development project scheme and comprehensive geological environment improvement zoning were formulated. According to the development conditions of different types of areas, according to local conditions, various methods, such as plugging holes and storing water, intercepting underground rivers, backwater from large springs, drilling wells, large wells and inclined shafts, were adopted to carry out demonstration of karst groundwater development and utilization and comprehensive management of ecological environment, and obvious social and economic benefits were achieved.
4. Groundwater exploration in areas with serious water shortage and endemic diseases.
There are some serious or seasonal water shortage areas in southwest red beds, loess plateau, northwest inland basins and alpine plateaus in China, as well as some drinking water epidemic areas related to inferior groundwater. The focus of the work is to carry out exploration and demonstration of drinking groundwater for people and livestock in different types of water-deficient areas and epidemic areas, find out the distribution law of groundwater, establish demonstration projects for groundwater development and utilization according to local conditions, and summarize the modes of groundwater enrichment and exploration and development, so as to provide technical support for groundwater exploration and development and utilization in similar areas. It mainly includes high-arsenic and high-fluorine groundwater areas such as the northwest of Hexi Corridor, inland basins such as Tarim, Loess Plateau, Inner Mongolia Plateau, Taihang Mountain area of Hebei, western mountainous area of Liaoning, Sichuan-Chongqing-Yunnan red bed area, Songnen Plain, Hetao Plain, Datong Basin and Yinchuan Plain, and Kaschin-Beck disease area of Sichuan. From 1999 to 2009, the hydrogeological survey of1:50,000 Km2 was completed, the remote sensing of1:50,000 Km2 was completed, and the hydrogeological drilling of1.58 million km2 was completed.
Through groundwater exploration, the distribution and present situation of serious water shortage area and inferior water area (high arsenic and high fluorine groundwater) are grasped macroscopically. According to the five types of water shortage: loess plateau, piedmont plain of inland basin, mountain plateau, red bed basin and inferior water area, typical areas are selected to carry out groundwater exploration and demonstration. Summing up experience and zoning; Radiation-driven, step-by-step solution "working mode and" investigation-demonstration-zoning "working method. In the bedrock mountainous area, the modes of bedrock fissure water enrichment, such as imbricate step, chessboard and concealed weathering crust, are found and summarized. In the inland arid basin and other areas where underground salt water and fresh water are alternately distributed, the formation and burial modes of fresh water bodies such as "river dilution type" and "ancient channel type" are summarized. In the hilly region of southwest red beds, a new understanding of "resource utilization of fractured water in weak aquifer of red beds weathering crust" was put forward, and a new mining technology of "small-caliber shallow well" and a supporting drilling technology of "micro-rig" were developed, and a new model of "one household, one well" and "decentralized water supply" was creatively established. In the distribution area of high arsenic and high fluorine groundwater, the geological environment types of high arsenic groundwater are summarized, including Cenozoic fault basin type, Quaternary alluvial plain type, Cenozoic coastal plain type and bedrock structure type.
5. Investigation of groundwater pollution in the eastern important economic zones.
The project of "A New Round of National Groundwater Resources Assessment" completed in 2002 shows that the situation of groundwater pollution in China is not optimistic. The quality of groundwater in two-thirds of cities has generally declined, and more than 300 cities have water shortages due to groundwater pollution [13]. In order to find out the situation of groundwater pollution in China and evaluate the degree and changing trend of groundwater pollution in various regions, China Geological Survey conducted a national groundwater pollution survey in 2006. The first stage is mainly deployed in the eastern important economic zones, including the Pearl River Delta, Yangtze River Delta, Huaihe River Basin Plain, North China Plain and Northeast Plain, and is scheduled to be completed on 20 10.
(1) Pearl River Delta. The investigation shows that regional groundwater acidification is serious and has become the biggest regional groundwater environmental problem. Nitrogen pollution is prominent and has been distributed in some areas; There are many heavy metals exceeding the standard, especially around the city and in the distribution areas of industrial and mining enterprises, and the lead and arsenic exceeding the standard rate is high; Although there are not many points where trace organic pollution exceeds the standard, there are many detection points. The investigation found that the pollution of typical points was serious, organic and inorganic pollution coexisted, and showed the characteristics of detecting and exceeding the standard of many trace organic pollutants.
(2) Yangtze River Delta. Basically find out the types of pollution sources and the present situation of groundwater pollution in the Yangtze River Delta. The anti-pollution performance of groundwater in the Yangtze River Delta (south of the Yangtze River) is classified and evaluated. The anti-pollution performance of regional groundwater is generally good, while the areas with poor and extremely poor anti-pollution performance are mainly distributed in the areas along the Yangtze River north of Zhangjiagang-Changshu-Taicang Yantietang, the karst mountainous areas southwest of Hangzhou and northwest of Yuhang, and the Qiantang estuary of Haiyan. The inorganic pollution of groundwater is mainly "three nitrogen", and the rate of NO3- exceeding the standard ranks first. The distribution of pollution sources around "cancer villages" and the main pollutants in water and soil environment have been preliminarily mastered; Ground penetrating radar successfully detected the leakage and pollution of gas stations in southern Jiangsu.
(3) North China Plain. According to the investigation results of groundwater pollution, the regional groundwater pollution is aggravated: the pollution indicators are mainly nitrogen (NO3-, NO2-, NH4+), heavy metals (Pb, As, CD, Cr6+, Hg) and trace organic pollutants; Most of them are point pollution, which is widely distributed and concentrated in the periphery of the city and the heavy chemical industry development zone and the affected area; Pollution is mainly caused by shallow groundwater, and pollutants are also detected at many points in deep groundwater; Organic pollution and inorganic pollution often coexist, showing multi-index characteristics of compound pollution, and the overall situation of groundwater environment is worrying.
(2) Environmental geological survey
1. National Survey and Evaluation of Mine Geological Environment
Completed the national survey and evaluation of mine geological environment in provinces (autonomous regions and municipalities), and systematically investigated all mine geological environment problems in China for the first time. * * * 1 13 149 mine survey shows that the mine area is 58 19000 hm2, which basically finds out the present situation of mine environment in China and determines the main mine environment in China. This paper systematically summarizes the types, characteristics and hazards of environmental geological problems caused by different regional environmental geological backgrounds and different mineral development in China, analyzes the leading factors of mine environmental geological problems in China, and establishes the national comprehensive evaluation index system of mine geological environment, which provides important basic data for government departments to implement mine geological environment management in the future. This paper selects typical areas, such as Tangshan coal mining area in eastern Hebei, Hunan Province and Jiaodong Peninsula. Through field investigation and remote sensing investigation, the dynamic investigation of mine geological environment is carried out, and the general idea, technical method and evaluation index of dynamic evaluation of mine geological environment are put forward.
2. Investigation and evaluation of environmental geology of major cities in China.
China is in the stage of accelerating urbanization. In order to find out the main environmental geological problems in the process of urbanization, the environmental geological investigation and evaluation of more than 300 cities in 3 1 province (autonomous regions and municipalities) were carried out. The focus of the work is to collect data, strengthen the secondary development and comprehensive research of data, carry out1∶ 50,000 environmental geological survey in key urban areas, and find out the types, distribution, causes and harm degree of geological environment background and environmental geological problems in major cities. From 2005 to 2009, the environmental geological survey of 65,438+096 cities above the prefecture level in 65,438+096 provinces (autonomous regions and municipalities) such as Jiangxi, Zhejiang, Sichuan, Yunnan, Heilongjiang, Gansu, Hainan, Henan, Hunan, Jilin, Guizhou, Fujian, Shanxi, Guangxi and Anhui was completed. 4999698686986
In order to provide comprehensive and detailed geological environment data for urban construction and sustainable economic and social development, China Geological Survey selected six cities, including Beijing, Shanghai, Tianjin, Guangzhou, Hangzhou and Nanjing, in 2003, and successively carried out three-dimensional geological surveys of cities. Through three-dimensional underground geological structure, engineering geological investigation and geological disaster investigation, historical geological data are integrated to establish a three-dimensional visual urban geological information management and service system. At present, the work of six pilot projects has been basically completed, and the results have played an important role in the fields of emergency water source exploration, landfill site selection, new city planning, urban subway construction, characteristic agricultural zoning, geothermal and shallow geothermal energy development and utilization.
3. Investigation and evaluation of geological environment in important economic zones
Important economic zones are the engines of China's economic development, with dense population and concentrated engineering construction. In order to support the development of important economic zones, since 2000, the geological environment investigation and evaluation of the southeast coast and important economic zones, Bohai Bay area, Yangtze River Delta area, Pearl River Delta area, economic zone on the west side of the Taiwan Strait, Beibu Gulf Economic Zone and urban agglomerations in the middle reaches of the Yangtze River have been started successively, and it is planned to be completed on 20 10. Through the environmental geological survey of1∶ 250,000 and the environmental geological survey of key areas of1∶ 50,000, we can understand the geological disasters such as crustal stability, coastal erosion and deposition, land subsidence and other major environmental geological problems in key ports and cities, and provide geological basis for formulating social, economic and urban development plans in this area.
(1) Southeast coast and important economic zones. We have basically found out the characteristics of coastal geological environment and the laws of coastal changes in southeast coastal areas such as the Pearl River Delta, Fujian coastal plain, Hainan Island, Guangxi Beibu Gulf and Suzhou-Wuxi-Changzhou area. It is found that there were eight large-scale coastal changes in the southeast coastal areas during the Quaternary period, and the coastal erosion and deposition were characterized by universality, temporal and spatial differences, diversity of forms, changeable types and intensified erosion trend. Understand the distribution, causes and dynamic changes of seawater intrusion in southeast coastal areas. Seawater intrusion area in the southeast coast 168Km2. The pollution status, characteristics and causes of groundwater pollutants, soil heavy metals and organic pesticides were found out. According to the investigation of land subsidence and ground fissures, the distribution area of soft soil in the Pearl River Delta is 7969Km2, and the area with land subsidence exceeding 200mm has reached more than 20,000 Km2. The potential of groundwater resources in southeast coastal areas is evaluated, and 24 standby water sources are delineated.
(2) Bohai Bay area. Three monitoring profiles of seawater intrusion were established in Dalian Daweijia, Qinhuangdao Zaoyuan and Shandong Laizhou Bay, and 25 monitoring profiles of geological environment were established in the muddy and muddy coastal zone of Bohai Bay. The GPS observation piers of ground deformation in Dalian-Qinhuangdao coastal zone and Dezhou-Yantai coastal zone were established, and the geological environment monitoring system in the coastal zone around Bohai Sea was formed. The exploration of emergency water source in Tianjin Binhai New Area was carried out, three emergency groundwater sites were investigated and evaluated, and the new mode of groundwater development in Tianjin Binhai New Area was discussed. Comprehensive investigation and evaluation of coastal environmental geology in Tianjin Binhai New Area, Caofeidian New Area and other key areas were carried out to provide services for the government and provide groundwater resources and geological environment protection for major project planning and construction areas.
4. Environmental geological survey of large watersheds and areas with fragile ecological environment
Around the planning of harnessing and development of large rivers and ecologically fragile areas, environmental geological surveys of large rivers and basins and ecologically fragile areas will be carried out to provide geological basis for flood control, engineering construction, harnessing and development and ecological environment protection. It mainly includes the middle reaches of the Yellow River, the source and upper reaches of the Yangtze River, the middle reaches of the Yangtze River, the Nujiang River basin and the desertification areas in eastern Inner Mongolia.
(1) Major flood-stricken areas in the middle reaches of the Yangtze River. The environmental geological survey found out the geological background conditions of the flood-stricken area, and deeply studied the main environmental geological problems related to flood formation, reflecting the characteristics of Quaternary geology, geomorphology, neotectonic movement and tectonic subsidence rate, river and lake sediment deposition, dike foundation stability, environmental geological zoning and so on. This paper demonstrates and evaluates the advantages and disadvantages of human engineering activities on flood formation, and puts forward ideas and suggestions for flood control and water control from the perspective of geoscience.
(2) Desertification in the north. This paper systematically collects, sorts out and comprehensively analyzes all kinds of information about desertification in the working area, and comprehensively discusses the research history, research status and main problems of desertification in northern China. In this paper, the types, distribution range, classification and harm degree of desertification in northern China are discussed in detail, and the geological background and human influence of different types of desertification are preliminarily analyzed. The distribution of groundwater resources in the desertification distribution area was preliminarily identified, and the countermeasures of desertification control in northern China were put forward.
5. Investigation and evaluation of crustal stability in major national engineering areas
In recent years, the state has planned and built a series of major construction projects such as the Qinghai-Tibet Railway and the Yunnan-Tibet Railway. These projects are distributed in different geological structural units and are affected and threatened by various geological disasters, active faults and seismic activities to varying degrees. Focusing on the safety of major projects and the crustal stability of major projects in the Qinghai-Tibet Plateau and its surrounding areas, a series of special investigations have been carried out in Quaternary geology and active fault investigation, crustal stability evaluation, geological disasters and major engineering geological problems. The main projects involved are: Qinghai-Tibet Railway, Yunnan-Tibet Railway, West-East Gas Transmission Project, West Route of South-to-North Water Transfer Project, and Water Diversion Project of Three Gorges, etc., providing planning, route selection, design, construction and operation management for these projects.
(3) Geological disaster investigation
1. Investigation and division of geological disasters in mountainous counties (cities) of China.
The geological environment in mountainous and hilly areas of China is fragile and prone to sudden geological disasters. 1999 to 2008, the investigation and zoning of geological disasters in 1640 mountainous and hilly counties were completed, with an investigation area of 6.5 million Km2. The survey was conducted in counties (cities). Through1:110,000 geological disaster surveys, the geological disaster-prone areas are delineated in the surveyed counties (cities), the monitoring and prevention network of geological disasters is established, the disaster prevention plan for major geological disasters is formulated, the county-level geological disaster information system is established, and the county-level geological disaster prevention plan is formulated. * * * More than 65,438+10,000 geological disasters and hidden dangers were identified through investigation. In view of the important hidden danger points found, the monitoring and early warning system of group monitoring and prevention with the responsibility system of county, township and village is established, the disaster prevention plan is compiled for the important hidden danger points, and the countermeasures and suggestions for the prevention and control of geological disasters in counties (cities) are put forward. The main types and distribution laws of geological disasters in mountainous and hilly areas of China have been basically identified, and the prone areas of geological disasters have been divided, which provides an important basis for local governments to make rational use of land and actively prevent geological disasters in the process of social development and economic construction.
2. Detailed investigation of geological disasters in key areas
In the areas prone to geological disasters in China, the Loess Plateau, Qinba Mountain Area, Sichuan-Yunnan Mountain Area, Hunan-Hubei-Guangxi Mountain Area and Xinjiang Ili Valley were selected to carry out detailed geological disaster investigation, with the focus of1∶ 50,000. Taking the county (city) administrative division as the basic unit, through remote sensing interpretation, ground investigation and mapping, we can find out the distribution of geological disasters and their hidden dangers, the formation and development characteristics of geological environmental conditions, and evaluate their harm degree, delineate the prone areas and dangerous areas of geological disasters, establish the geological disaster information system, and establish and improve the monitoring network combining group and specialty. By the end of 20 10, the investigation task of 127 counties (cities) was completed, covering an area of 394,000 Km2.
3 sudden geological disaster monitoring and early warning demonstration
In order to promote the monitoring and early warning of geological disasters in China, different types of sudden geological disasters are selected to carry out monitoring and early warning demonstrations, and the dynamic changes of hidden dangers of major geological disasters are tracked for a long time, and the early warning ability of geological disasters is obviously improved. It mainly includes: monitoring and early warning demonstration of geological disasters in Lanzhou, Baota District of Yan 'an, Ya 'an, Huaying Mountain, Beijing, Southeast Fujian, Ailaoshan and Jiangxi.
4. Investigation and monitoring of land subsidence in key areas
Significant progress has been made in the investigation and monitoring of land subsidence in the Yangtze River Delta, North China Plain and Wei Fen Basin, and the monitoring level has been continuously improved, providing a basic basis for the prevention and control of regional land subsidence. The investigation and monitoring of land subsidence in the Yangtze River Delta covers the land subsidence monitoring network in the Yangtze River Delta (south of the Yangtze River), integrates various monitoring technologies, and has complementary advantages, basically realizing the three-dimensional monitoring of land subsidence point, area and dynamic changes; The spatial distribution and variation characteristics of land subsidence in the Yangtze River Delta (south of the Yangtze River) are preliminarily identified. The economic losses caused by land subsidence and ground fissures are evaluated. A three-dimensional groundwater flow model of pore confined water in the Yangtze River Delta (south of the Yangtze River) is established, and the critical groundwater levels in different geological structure areas are determined with land subsidence as the constraint factor. The causes of regional land subsidence in the Yangtze River Delta have been basically identified. The geological structure of loose sediments is an important internal cause of regional land subsidence, groundwater exploitation is the main influencing factor of land subsidence, and large-scale urban construction is an important influencing factor of land subsidence in the central city of Shanghai. The coupling model of groundwater flow and land subsidence between Shanghai and Jiangsu, Suzhou, Wuxi and Changzhou is established for the first time, which truly depicts the changes of various geological parameters in the process of land subsidence, improves the early warning and forecasting level of land subsidence, and makes China's land subsidence research in the leading position in the world. The study of regional land subsidence risk management zoning provides effective technical support for the government to implement regional land subsidence prevention and control management and disaster reduction and prevention.