论文部分内容阅读
从黄河谈起黄河以灾害频繁闻名于世,其所以为害,是因为它水中挟带的泥沙多。中游最多时,一立方米的水中,有500公斤泥沙;支流中最多时,达到一立方米水中有1,000公斤泥沙。俗语说:“跳进黄河洗不清”就是形容它这个特点的。这样多的泥沙从那里来?又被水流带到哪里去了呢?雨点滴落在流域的土地上,表土被雨滴溅起,成层地被水流带走,汇流到低洼之处,流速加大,流速越大冲刷泥土的能力就越强,这样
From the Yellow River, the Yellow River is famous for its frequent disasters, and its damage is due to the large amount of sediment in the water. In the midstream, there is 500 kilograms of sediment in one cubic metre of water and 1,000 kilograms of sediment in one cubic metre of water. As the saying goes: “jumping into the Yellow River is not clear” is to describe its characteristics. Where is so much sediment coming from? Where is the water carried? The rain falls on the land of the river basin. The topsoil is splashed by the raindrops. The layered ground is carried away by the currents, converging to the low-lying areas. Larger, the greater the flow rate, the stronger the ability to scour dirt, so