摘要
在三峡水库来水来沙条件中，重点产沙区输出的沙量在很大程度上影响着长江上游来沙量的多寡，处于相当重要的地位。重点产沙区主要在金沙江下游和嘉陵江上游，两区年平均输沙量21800万t，多年平均径流量540亿m3，分别占三峡进库站寸滩来沙量和来水量的47．2％和15．4％。占三峡出库站宜昌来沙量和来水量的41．4％和12．3％。但除去某些典型年份外，非重点产沙区面积广大而输沙量往往占三峡水库米沙量的一半以上。所以，非重点产沙区输沙量在三峡水库来沙条件中的地位也不可轻视。
The volume of sediments from key sediment-producing zones has been affecting sedimentdischarge into upstream Yangtze Ruver, which is of great importance in the sediment yield into the ThreeGorges reservoir. The key sediment-producing zones are located at downstream of the Jinsha River andupstream of the Jialin River with mean annual sediment runoff of 21. 8×107t and mean annual runoff rateof 540×108, amounting to 47. 2% and 15. 4% of yields of water flow and sediment prenectively at theupstream sediment station of the Reservoir, and 41. 4% and 12. 3% at the downstream one, YichangSediment Station. The sediment yield from non - key sedimentproducing zones would be more than half ofthose into the Three Gorges reservoir due to an extensive area of the non - key zones other than sometypical years. Therefore the sediment runoff from the non - key zones into the Thrce Gorges reservoircould not be ignored.
出处
《中国三峡建设》
1995年第5期24-25,47,共3页
China Three Gorges Construction
关键词
输沙量
径流量
三峡水库
重点产沙区
Sediment runoff Runoff rate Three Gorges reservoir Key sediment-producing zone
