无定河流域黄土区的侵蚀速率

The Erosional Rates of the Loess Region in the Wudinghe River Catchment

本文根据对无定河阶地高差沿程分布的二次相关分析和对黄土沟壑的隔时遥感测量,表明干流自Q_2~2以来平均下切速率为0.37Cm/yr;Q_4~3以来的下切速率为53Cm/yr。黄土沟壑的平均溯源侵蚀速率为1.5m/yr;流域面上的下蚀速率为0.17-2Cm/yr。

Based on the fieldwork andquadratic analysis about therelative hight of the terracesof the Wudinghe river and thechannel length from the terracelocation to the head of theriver and the time-lapse remo-te sensing measuring, this pa-per shows that the rate ofthe headward erosion is about1.5m. per year in the Ioessgullies.The downward erosionrate was 0.37cm./yr.in Q_2~2,and has been being 0.53cm/yr.since Q_4~3 and about 0.2cm/yr.since 700yr.B. P. in mainchannel and 0.18-2cm./yr. inloess hilly-gullied rigion.