松花江流域侵蚀产沙演变特征分析

利用松花江流域116个站点的降水资料和14个典型流域水文站的径流泥沙资料,在分析降水、径流和输沙时间变化特征的基础上,研究了该区侵蚀产沙演变特征及其主要影响因素.研究结果表明,1961-1990年松花江流域降水和径流无显著增长趋势,但输沙量增长显著,每10 a平均增长幅度为34.7%,丘陵漫岗区输沙量增长幅度较山区更为显著.流域输沙量自1979年开始显著增加,降水量变化不是输沙量快速增长的主要原因,人类活动导致的下垫面变化可能是输沙量增加的重要原因.

Evolution of Sediment Yield in the Songhua River Basin

Severe soil erosion has threatened land resources in Northeastern China,however,a few researches were conducted on sediment yield in the region. To study the characteristics of the evolution of sediment yield in the Songhua River basin,the characteristics of temporal variation of precipitation were analyzed by using daily precipitation records from 116 stations and the characteristics of temporal variation of runoff and sediment load were analyzed based on daily runoff and sediment yield data from 14 typical hydrological stations. Results showed that from 1961 to 1990,there was no obvious increasing trend of precipitation or runoff in the studied watersheds,but the increasing trend of sediment load was obvious,with an average trend of 34.7% in each 10 years,and the trend was more obvious in hilly region than mountainous region. Sediment yield has increased sharply since 1979 and human activities,rather than precipitation,may play an important role in the increase of sediment yield.