摘要
本文系统的分析研究了长江上游地面侵蚀和河流泥沙两个系统。认为长江上游地面侵蚀的发展主要受人类在农业耕作、林业开采、草原开发、修路、基建等方面不合理的社会经济活动的影响,导致长江上游水土流失面积不断扩大。同时作者还分析和预测了在禁止各种新的破坏情况下,预计到2000年按现有的治理速度,上游地区侵蚀量将由15.68亿t降到10.22亿t。分析表明:长江上游地区输移比远小于1,且受流域面积、地质地貌、地面物质组成及人为活动等多种因素的影响。通过分区预测地面侵蚀对河流泥沙的影响,认为今后在上游通过治理,使地面侵蚀量虽有较大减少,但河流泥沙的变化仍然较小,到2000年宜昌站平均悬移质输沙量将在4.88～5.02亿t之间变化。
The surface erosion and fluvial silt in upper reaches of Changjiang River were analyzed systematically. It was considered that the development of surface erosion in upper Changjiang was affected by unreasonable social economic activities such as the agricultural cultivation, forest and prairie exploitation,roads building,and capital construction and so on which enlarges the area of soil and water loss in upper Changjiang River. The author also analyzed and forecasted that the erosion amount would reduce to 1.022 billion tons from present 1.568 billion tons in the end of this century based on recent steps. By regional forecasting the effect of surface erosion on fluvial silt, it was believed that the surface erosion could be reduced largely by harness the upper Changjiang River,but the fluvial silt may be not changed a lot. The silt amount of water carry will range from 0.488 to 0.502 billion tons at Yichang hydrometric station in 2000.
出处
《水土保持通报》
CSCD
北大核心
1991年第1期9-17,共9页
Bulletin of Soil and Water Conservation
关键词
地面侵蚀
河流泥沙
长江上游
upper reaches of changjiang river
surface erosion fluvial slit amount of water carry silt
