摘要
根据1917年测绘资料和1996年干流治理勘测数据分析了近80 a来小清河河道演变特征,以小清河流域代表站点资料分析了近50 a径流时空分布特征,并揭示了径流变化对河道演变的影响机理。河口平面形态的变化反映了汛期冲刷作用的影响,对应于流域径流年内分配的规律。纵剖面演变则表现为随河流流向河床明显下切,反映了冲刷作用越向下游方向越强烈,与上中游径流量随时间增加的趋势一致。下游自20世纪70年代末流量的持续衰减是造成河口段冲淤接近平衡的主要原因。
Based on the mapping data of 1917 and survey data of 1996, this paper analyzed the channel evolution characteristics, and analyzed the runoff temporal and spatial distribution characteristics in recent 50 years using the typical station data of the Hsiao-Ching River, The influence mechanism of runoff variation on channel evolution was revealed. The estuarine plane morphology variation reflects the effect of flood scouring and the distribution rule of runoff inter-annual of the catchment. The Longitudinal profile evolution is shown as riverbed cutting obviously along the flow- ing direction, which reflects the more intense scouring along the river direction and according with the trend of runoff increasing with time of the up- per and middle reaches. The relative balance between silting and scouring in estuary is due to the continuous flow decreasing of the lower reaches since the late 1970s.
出处
《人民黄河》
CAS
北大核心
2013年第12期77-79,82,共4页
Yellow River
基金
水利部公益性行业科研专项(200801026)
中国科学院对外合作重点项目(GJHZ1016)
关键词
径流
时空分布
河道演变
小清河
runoff
channel evolution
temporal and spatial distribution
Hsiao-Ching River
