论文部分内容阅读
黄河下游从孟津至河口全长790公里,它具有悠久的历史,最久的有3,000多年,最短的也有102年。在这漫长的岁月里,河道的形成及其生命都是很复杂的,它不但受到水流、泥沙、河床的自然因素的影响,而且受到有史以来人类活动的作用,所以它的河道形态已经不是天然的情况。黄河下游的上段河道宽浅,而下段则窄深,这也是人为作用的结果,所以它的河道形态跟一般的河流不同。本文系根据过去已有
The lower reaches of the Yellow River from Mengjin to the estuary a total length of 790 km, it has a long history, the longest 3,000 years, the shortest there are 102 years. During these long years, the formation of the river channel and its life are very complicated. It is not only affected by the natural factors of water flow, sediment and riverbed, but also has been subjected to human activities ever since, so its channel shape is no longer Natural situation. The upper reaches of the lower Yellow River are shallow and shallow, while the lower reaches are narrow and deep. This is also the result of human activities, so the shape of the river is different from that of a typical river. This article is based on the past