Topography
The terrain of Yantai is a low hilly area with gentle rolling hills and criss-crossing ravines. Mountains account for 36.62% of the total area, hills account for 39.7%, plains account for 20.78%, and depressions account for 2.90%. The low mountainous area is located in the middle of the Yantai Mountains in the city. It is mainly composed of Daze Mountain, Aishan, Luoshan, Yashan, Cishan, Kunyu Mountain, Zhaohu Mountain, etc. The mountains are mostly composed of granite, with an altitude of more than 500 meters. The peak is Kunyu Mountain, with an altitude of 922.8 meters. Hilly areas are distributed around low mountainous areas and their extensions, with an altitude of 100-300 meters. They are gently undulating and winding. The slopes are gentle, the ravines are shallow and wide, and alluvial deposits are developed in the ravines. The soil layer is thicker. Because Yantai has abundant precipitation, humid air, and a mild climate, the low hills and mountains are lush and picturesque all year round. In spring, the mountains are green and the fragrance of flowers is astonishing; in summer, they are lush and full of life; in autumn, the red leaves in the fruit trees are colorful; in the middle of winter, they are covered in silver and exquisite.
Hydrological conditions
Within the city, the river network is relatively developed, with many small and medium-sized rivers, and 121 rivers with a length of more than 5 kilometers. Among them, the Wulong River has a drainage area of ??more than 300 square kilometers. There are 7 rivers: , Dagu River, Dagu Jia River, Wang River, Pearl River, Huangshui River and Xin'an River at the boundary of Huanghai Sea. The main rivers use the "Jiaodong Roof" formed by the Kunyu Mountains, Yashan Mountains, Aishan Mountains, Luoshan Mountains and Daze Mountains that stretch east and west as the watershed, and flow into the sea from the north to the south. The Wulong River and Dagu River flow into the Yellow Sea to the south; the Dagujia River and Xin'an River flow into the Yellow Sea to the north; the Huangshui River, Jiehe River and Wanghe River flow into the Bohai Sea. Its characteristics are that the river bed has a large relative drop, the source is short and the flow is rapid, and it rises and falls violently. It is a monsoon rain source type river. The small plain formed by alluvial deposits has thick and fertile sandy soil and is rich in apples, cherries, pears and grapes.
Climate characteristics
The annual average precipitation is 651.9 mm, the annual average temperature is 11.8°C, the annual average relative humidity is 68%, the annual average sunshine hours are 2698.4 hours, and the total solar radiation is The average value is 5224.4 MJ/m2, the annual average wind speed is 3-4 meters/second in inland areas and 4-6 meters/second in coastal areas. The city's average frost-free period is 210 days.
Yantai has a temperate monsoon climate and is one of the few cities in China facing the sea in the north (others include Haikou, Keelung, Taiwan, and Penglai, a subsidiary of Yantai). Therefore, the air is relatively dry in summer and relatively mild in winter. Year-round With an average temperature of about 12°C, it is a famous summer vacation and leisure resort in northern my country.
Characteristics of seawater
Coastal surface water temperature changes are more obvious and larger than those in the open sea, with the annual average water temperature ranging from 11 to 14°C. The annual average salinity of seawater surface is about 28-31‰. The tides along the coast from Laizhou to Longkou are irregular semidiurnal tides, and the tides from Longkou to Muping and Haiyang City are regular semidiurnal tides.