黄河河口演变(Ⅱ) kl——(二)1855年以来黄河三角洲流路变迁及海岸线变化及其他

Using the observations made in the second half of the 20th centuary, the variation of runoff and sand transport of the Yellow River is studied, and it is found that both have progressively decreased during the period between the 1950's and 1990's. The water stoppage is analysed with regard to its perniciousness, its cause of formation, and alleviation measures. Also analysed in the influence brought to the lower reaches of the Yellow River by its estuarine eposit, its extension and course change. Finally, the variation of the coast line of the yellow River Delta since 1855 is discussed quantitatively.