论文部分内容阅读
人类活动对水文泥沙的影响是很大的。长江上游地区,人口剧增,破坏频繁,恶化了丰枯比,大量的泥沙输入长江干流,加大江水浑浊度,延长浑浊时间,沿江的水文站竟检测不出来。八十年代宜昌站的泥沙量完全同五十年代初等量,5.2亿吨。由此得出了“30多年来,长江上游的沙量没有变化,往后也不会出现本质变化”的凝固结论。本文仅就人类活动影响三峡工程增沙值作点初探,得到目前宜昌站平均沙量为6.59亿吨,50年后则为6.85亿吨。
The impact of human activities on hydrological sediment is great. In the upper reaches of the Yangtze River, the population is increasing sharply and destroying frequently, deteriorating the abundance and dryness ratio, inputting a large amount of sediment into the mainstream of the Yangtze River, increasing the turbidity of the river water and prolonging the turbidity time, and the hydrological stations along the river can not be detected. The amount of sediment in Yichang Station in the 1980s was exactly the same amount as the early 1950s, with 520 million tons. From this, we can conclude the “solidification conclusion that the sediment concentration in the upper reaches of the Yangtze River has not changed in the past 30 years and will not change in the future.” This paper only discusses the impact of human activities on the increase of sediment yield in the Three Gorges Project. The average sediment yield of Yichang Station now stands at 659 million tons and 685 million tons after 50 years.