Variation characteristics of the Yellow River Delta

The changing characteristics of the Yellow River Delta are: the bigger the delta, the faster the water flow.

The plain coast of the Yellow River Delta starts at the mouth of Zhangzhang Wei Xin and ends at the mouth of East longitude branch. From the mouth of Zhangwei Xinhe River to the mouth of Shunjiang River on the east side of Taoer River, it is a part of the plain coast of the ancient Yellow River Delta. There are many twists and turns along the coast, with a rate of 3.8. It was mainly formed by sedimentation of the Yellow River before 1 128 (the second year of Song Jianyan). It was rarely affected by the tail swing of the Yellow River for more than 850 years and was remoulded by tides and waves for a long time.

Broad flat tidal flats and dendritic tidal gullies are formed along the coast. Tidal flat consists of cohesive silt and coarse silt. The average slope to the sea is less than110000. The width of tidal flat gradually increases from west to east, about 6 kilometers outside the mouth of Zhang Weixin River and 22 kilometers inside the mouth of Taoerhe River. It is the largest tidal flat along the Bohai Sea, with the largest scale and the densest distribution.

Climatic characteristics of the Yellow River Delta;

The Yellow River Delta is located in the mid-latitude, warm temperate zone, with its back land facing the sea, influenced by Eurasia and the Pacific Ocean, and belongs to the warm temperate semi-humid continental monsoon climate zone. The basic climate features are: Leng Xia is hot in winter, with four distinct seasons. Spring is dry and windy, early spring is changeable, late spring is often cold, and late spring is rapid, which often causes spring drought; Summer is hot and rainy, hot and humid, and sometimes it is attacked by typhoons.

In autumn, the temperature drops, the rain drops sharply, and the sky is crisp; In winter, the weather is dry and cold, cold wind blows frequently, and rain and snow are scarce. The main wind directions are north wind and northwest wind. The temperature difference between the four seasons in the Yellow River Delta is obvious. The annual average temperature is11.7 ~12.6℃, the extreme maximum temperature is 4 1.9℃, and the extreme minimum temperature is 23.3℃. The annual average sunshine hours are 2590 ~ 2830 hours; The frost-free period is 2 1 1 day; The average annual precipitation is 530-630mm, of which 70% is distributed in summer. The average evapotranspiration is 750 to 2400 mm.