Impact of rainfall movement on soil crust development

被引：0

作者：

Qi-hua RAN ^{[1
]}

Zhi-nan SHI ^{[1
]}

Xu-dong FU ^{[2
]}

Guang-qian WANG ^{[1
,2
]}

Yue-ping XU ^{[1
]}

机构：

[1] Institute of Hydrology and Water Resources,Zhejiang University

[2] State Key Laboratory Of Hydroscience and Engineering,Tsinghua University

来源：

InternationalJournalofSedimentResearch | 2012年 / 27卷 / 04期

关键词：

Moving rainfall; Crust development; Steady-state; Saturated hydraulic conductivity;

D O I：

暂无

中图分类号：

S157 [水土保持];

学科分类号：

0815 ; 082802 ; 090707 ; 0910 ;

摘要：

The impact of rainfall event movement on soil crust development was investigated via laboratory experiments and physics-based hydrological-response simulation.Runoff and soil water content data were analyzed in order to study different crustal development periods under a variety of precipitation conditions.The results showed that the formation of crust significantly changed soil saturated hydraulic conductivity（K;） and runoff,while a steady state,which could be broken by an extended period of raindrop impact,was found to exist for both the crust and,subsequently,runoff characteristics.The decrease in K;was as high as 86%for downstream-moving events,and 72%for upstream-moving events,illustrating that the direction of rainfall movement has a more significant impact on crust formation than rainfall intensity and duration.As downstream-moving rainfall events may have a greater effect than those moving upstream,the development of a depositional crust before raindrop impact may play an important role in determining the final K;value.

引用

页码：439 / 450

页数：12

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