Yantai is a hilly area with gentle hills and ravines. Mountains account for 36.62% of the total area, hills 39.7%, plains 20.78% and depressions 2.90%. The low mountainous area is located in the middle of Yantai Mountain in the city, and it is mainly composed of Daze Mountain, Ai Shan, Luoshan, Yashan Mountain, Cishan Mountain, Kunyu Mountain and Zhaohushan Mountain. The mountain is mostly composed of granite, with an altitude of more than 500 meters. The highest peak is Kunyu Mountain, with an altitude of 922.8 meters. The hilly area is distributed around the low mountainous area and its extension, with an altitude of 65,438+000-300m. The terrain is gentle and undulating, the slope is gentle, the valley is shallow and wide, and the alluvial deposits in the valley are developed and the soil layer is deep. Due to the abundant precipitation, humid air and mild climate in Yantai, the low hills are lush and picturesque all year round. In spring, the mountains and rivers are beautiful and the flowers are overflowing; Summer is lush and full of vitality; In autumn, the fruit forest is full of red leaves and colorful; In the dead of winter, it was wrapped in silver.
Hydrological conditions
The inland river network of the city is relatively developed, and there are many small and medium-sized rivers. There are 1 and 2 1 rivers with a length of more than 5 kilometers, among which there are 7 rivers with a basin area of more than 300 square kilometers, namely, Wulong River, Dagu River, Dagujia River, Wanghe River, Mingzhu River, Huang Shuihe River and Xin 'anjiang River. The main rivers are divided by the "Jiaodong Roof" formed by Kunyu Mountain, Yashan Mountain, Ai Shan Mountain, Luoshan Mountain and Daze Mountain, and flow into the sea from north to south. The Wulong River and Dagu River flow southward into the Yellow Sea. Dagujia River and Xin 'anjiang River flow northward into the Yellow Sea; Huang Shuihe, He Jie and Wanghe rivers flow into the Bohai Sea. It is characterized by large river bed gradient, short source and rapid flow, and it belongs to the source river of monsoon rainfall. The alluvial plain is thick and fertile, rich in apples, cherries, pears and grapes.
Climatic characteristics
The annual average precipitation is 65 1.9 mm, the annual average temperature1.8℃, the annual average relative humidity is 68%, the annual average sunshine hours are 2698.4 hours, the annual average total solar radiation is 5224.4 MJ/m2, and the annual average wind speed is 3-4m/s in inland areas and 4-4m/s in coastal areas.
Yantai has a temperate monsoon climate, and it is one of the few cities in China that faces the sea in the north (others are Haikou, Keelung in Taiwan Province Province and Penglai under Yantai), so the air is relatively dry in summer and humid in winter. With an average annual temperature of about 12℃, it is a famous summer resort and leisure resort in northern China.
Seawater characteristics
The change of surface water temperature along the coast is more obvious and greater than that in the open sea, and the annual average water temperature is between 1 1 ~ 14℃. The annual average surface salinity of seawater is about 28 ~ 3 1 ‰. The coast from Laizhou to Longkou is irregular and the coast from Longkou to Muping and Haiyang is regular.