Environmental geological survey and vulnerability assessment of key areas around Bohai Bay is a large-scale land and resources survey project deployed by China Geological Survey, which started from 2004 to 2007. The main undertaking units are Tianjin Institute of Geology and Mineral Resources, Liaoning Institute of Geology and Mineral Resources, Hebei Geological Survey Institute, Hebei Geological Environment Comprehensive Monitoring Station, Tianjin Geological Survey Institute, Shandong Geological Survey Institute, Shandong Geological Environment Comprehensive Monitoring Station, Physical Geological Data Center of Ministry of Land and Resources, and Institute of Resources and Geography of China Academy of Sciences.
The operation area covers Tangshan, Tianjin Binhai New Area, Yantai and other major cities around the Bohai Sea, as well as important ports such as Dalian Port, Caofeidian Port, Tianjin Port and Yantai Port. Project investment1:50,000 special environmental geological survey 2344km2,1:50,000 special hydrogeological survey 3824.4 1km2,1:50,000 TM remote sensing interpretation 6500km2, INSAR land subsidence monitoring 2270km2, Quaternary drilling 580m and engineering geological drilling/kloc.
There are total reports 1 copy, special reports 165438, and atlas 1 copy, and a database of environmental geological survey and vulnerability assessment in key areas around Bohai Sea 1 copy has been established. The technical personnel of the undertaking unit published about 10 papers in professional magazines around the project work content.
(1) Water supply safety of key cities around Bohai Sea and its countermeasures
The degree of water supply security in Tangshan, Tianjin Binhai New Area and Yantai was investigated and demonstrated. The hydrogeological conditions, groundwater dynamics, groundwater resources, groundwater development and utilization status and groundwater resources development and utilization potential of three key cities were identified. This paper demonstrates the water supply structure, water demand planning and water resources guarantee degree of key cities, and puts forward some technical countermeasures and suggestions for urban water supply such as rational development and utilization of groundwater, construction of urban emergency water sources and underground reservoirs. This is a demonstration t/a; There are 3 large-scale emergency water sources and 4 small and medium-sized emergency water sources, with an emergency output of 236,000 t/a; There are two underground reservoirs, which can increase the groundwater exploitation by 83 million ~ 65438+99 million t/a.
(2) The main environmental geological problems and countermeasures of the main ports around Bohai Sea.
An environmental geological survey of1∶ 50,000 was conducted in Dalian Port, Caofeidian Port, Tianjin Port and Yantai Port. Environmental geological conditions of key ports, degree of water supply guarantee, geological disasters such as collapse, landslide, coastal erosion and land subsidence, distribution and threat of active faults, current situation and harm of storm surge, etc. Has been discovered. The port engineering geological suitability evaluation, water supply guarantee degree demonstration, geological disaster risk evaluation and storm surge risk evaluation were carried out.
(3) Countermeasures for coastal zone development around Bohai Sea
After years of monitoring and research on the changes of modern geological environment in the coastal zone around Bohai Sea, the GPS measurement of land deformation in the coastal zone was carried out, and the automation construction of Qinhuangdao sea level monitoring station was completed. Evolution of shallow stratigraphic structure and sedimentary environment in coastal lowland and intertidal zone, interannual and multi-year variation characteristics of coastline, surface sediments and their geochemical characteristics in western Bohai Bay, composition and distribution characteristics of benthos in intertidal zone and shallow sea area of Tianjin, topography, stratigraphic structure and particle size distribution of seabed sediments, etc. The active faults in this sea area are investigated, and the suitability of land reclamation in intertidal zone is evaluated, which provides important technical basis for land reclamation, coastal zone development and coastal zone protection. On the basis of comprehensive investigation, this paper analyzes the evolution trend of modern geological processes in Tianjin Binhai New Area, and holds that the depression of Binhai New Area has been formed, the basin-forming trend of Binhai New Area will be further intensified, and the ecological environment will be further deteriorated.
Carry out the application research of Quaternary research in land subsidence and engineering construction, and determine the corresponding relationship between Quaternary sedimentary environment and foundation bearing capacity in Tianjin coastal area.
(4) Countermeasures for monitoring and early warning of geological disasters around Bohai Sea.
Based on the monitoring and early warning demonstration study of three typical sections, Dalian Daweijia, Qinhuangdao Zaoyuan and Shandong Laizhou Bay, three automatic monitoring sections of seawater intrusion in Dalian Daweijia, Qinhuangdao Zaoyuan and Shandong Laizhou Bay were established, and 18 self-recording water level gauge was installed. Through the demonstration study of monitoring and early warning of three typical sections, the mechanism of seawater intrusion is found out, and the indicators and methods suitable for local seawater intrusion monitoring are established for the first time. The numerical prediction model of seawater intrusion is established, and the real-time monitoring, real-time transmission, real-time analysis and real-time interaction of the numerical model are realized. The monitoring and early warning model of seawater intrusion is put forward, which has important demonstration significance for seawater intrusion prevention and monitoring and early warning.
Qinhuangdao sea level automatic monitoring and real-time data transmission system has been established and has been incorporated into the national storm surge early warning system.
(5) Investigation and evaluation of coastal environmental geology in Tianjin Binhai New Area.
Complete the construction of land subsidence stratification standard in Tanggu, and create the deepest record of whole hole coring for loose sediments in North China (1266m). A major breakthrough has been made in drilling coring technology and technology in loose formation, and the integrity of the whole hole core is good, with the heart rate of sand layer reaching 90. 14% and that of cohesive soil reaching 92.58%. The standard group of land subsidence stratification with the largest controlled depth in Asia (12 18m) was established, and three important water-bearing sand layers were found in Minghuazhen Formation. A comprehensive study on the basic geology, engineering geology and land subsidence mechanism of this hole has been preliminarily carried out, which has laid a solid foundation for scientific research and land subsidence prevention in Tianjin Binhai New Area.
Second, the scope of application and application examples
The achievements of the project include the demonstration of water resources security in important cities, the environmental geological survey of important ports, and the monitoring of modern geological environment in coastal areas. It can provide geoscience information for the planning, construction and sustainable development of key areas in Bohai Economic Zone, and at the same time promote the research of Quaternary basic theory in coastal areas.
The results of the project actively serve the relevant departments of local governments, and play an important role in supporting the preparation of land resources development and utilization planning, groundwater resources development and utilization planning, coastal geological environment protection and disaster prevention planning, and provide important technical support for the prevention and control of land subsidence in Tianjin and the planning and construction of Tianjin Binhai New Area.
Third, promote the transformation mode.
Media promotion, conference exchange, project cooperation, consulting services, etc.
Technical support unit: Tianjin Geological Survey Center of China Geological Survey.
Contact: Ma Zhen
Mailing address: No.4, No.8 Road, Gu, Hedong District, Tianjin.
Postal code: 300 170
Tel: 022-84112961.
E-mail: tjmazhen @126.com.