do you know?There are also triangles underwater

Source: Science Popularization China

The Yangtze River Delta and the Pearl River Delta are no stranger to the geographical concept of the Delta. But do you know, in addition to land, there are bougainry underwater.

Delta refers to the accumulation system formed by the river flowing into the lake or the ocean. When the river flows into the sea, the water flows gradually dispersed due to factors such as the widening of the river or the trend. The accumulation rate is greater than the erosion rate of marine power. In addition, the river contains a large amount of fine clay existed in the state of collagen. As soon as these clay encounters seawater, the condensate will be formed under the action of salt. This is also the case of the formation of underwater Delta. Taking the underwater underwater Delta as an example, it is mainly made of sedimentation at the entrance of the rivers and rivers.

The area of ​​the underwater Delta is not smaller than the on -land Delta. As the continuation of the on -land Delta, there are some Greater River Delta. The area of ​​its underwater delta often exceeds the land triangle.

The underwater triangle is below the low tide, including the front triangle and the front slope of the Delta. The most intersection of the Delta is the front triangle. It belongs to the front edge of the Delta's front edge. It has a gentle slope and a flat terrain, consisting of clay and fine powder sand.

Triangle Qianpo is mainly composed of thicker powder sand and sand, so it has good sortability. The sediments near the mouth are the thickest, the closer to the sea, and the sediment gradually becomes thinner. The main geomorphic forms include the bass of the fork estuary, the tide of the sandy ridge and the gallic bay.

Different regions are also different due to the different terrain, hydrological conditions, etc. For example, the underwater Delta under the Yangtze River is located on the low tide to the water depth of 55 meters. It consists of three parts: shallow water platform, anterior edge slope belt, and front triangle. The Yellow River Delta Yellow River entrance to Haikou was not obvious. It was integrated into the underwater plains. This is because there are 1/100 slope underwater slope here. There is a strong trend in front of the underwater slope. The underwater Delta forms conditions.

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