摘要
运用泥沙收支平衡（Sediment budget）的概念确定长江中游宜昌-武汉河段的泥沙输移比，并运用数理统计方法，研究了1955～1997年间河道泥沙输移比对水沙变化的响应。从总体上看，河道泥沙输移比有较显著的增大趋势。输移比的变化可分为4个阶段：1955～1962年为快速增大；1963～1975年亦为增大，但增速减慢；1976～1979年为迅速减小；1980—1997年为较快增大。在分析了若干水沙指标对河道泥沙输移比的影响的基础上，建立了宜昌-汉口河段泥沙输移比与宜昌站的来水量和来沙量以及3口分水比和分沙比、宜昌站洪峰流量之间的多元回归方程。1980-1997年间的方程表明，宜昌站来水量越多、3口分流比越小，宜昌-汉口河段泥沙输移比越大；宜昌站来沙量越少，3口分沙比越大，泥沙输移比越大；宜昌站洪水流量越大，泥沙输移比越小。
Sediment delivery in a fluvial system can be divided into two coupled processes, the delivery on hillslopes and in river channels. The channel sediment delivery ratio （SDR） of the Yichang - Wuhan reach in the middle Yangtze River has been determined using the concept of sediment budget at channel - reach scale, based on which the variation in SDR from 1956 - 1997 has been studied in response to the variation in sediment load and flow inputs. The SDR showed a increasing overall trend, but its variation can be divided into d stages ： （ 1 ） increased rapidly from 1955 to 1962; （2） still increased from 1963 to 1975, but the rate of increase became slower; （3） rapidly decreased from 1976 to 1979; and （4） increased rapidly from 1980 to 1997. Some indices describing flow and sediment load characteristics have been related to the SDR, and then a multiple regression equation has been established between SDR and these influencing factors. The equation based on data from the period from 1980 to 1997 indicates that SDR increases with the increase in the river flow at Yichang station and the decrease in the water diversion ratio from the 3 outfalls; it increases with the decrease in sediment load at Yichang station and the increase in the sediment diversion ratio from the 3 outfalls; it decreases with the increase in annual flood discharge at Yichang station.
出处
《山地学报》
CSCD
北大核心
2008年第1期15-21,共7页
Mountain Research
基金
国家重点基础研究规划项目(2003CB415202)~~
关键词
河道泥沙输移比
泥沙收支平衡
水沙变化
长江
channel sediment delivery ratio, sediment budget at channel scale, flow and sediment load changes,Yangtze River
作者简介
许炯心（1948-），男，四川人，研究员，主要研究方向：河流地貌、侵蚀产沙。
