Influence of spatial variations of microtopography and infiltration on surface runoff and field scale hydrological connectivity

被引：116

作者：

Appels, Willemijn M. ^{[1
]}

Bogaart, Patrick W. ^{[2
]}

van der Zee, Sjoerd E. A. T. M. ^{[1
]}

机构：

[1] Wageningen Univ, Wageningen, Netherlands

[2] Univ Wageningen & Res Ctr, Wageningen, Netherlands

来源：

ADVANCES IN WATER RESOURCES | 2011年 / 34卷 / 02期

关键词：

Connectivity; Surface runoff; Microtopography; Infiltration; Numerical experiments; DEPRESSION-STORAGE CAPACITY; OVERLAND-FLOW; WATER CONTAMINATION; SOIL; PHOSPHORUS; GENERATION; ROUGHNESS; MODEL; APPROXIMATION; CONDUCTIVITY;

D O I：

10.1016/j.advwatres.2010.12.003

中图分类号：

TV21 [水资源调查与水利规划];

学科分类号：

081501 ;

摘要：

Surface runoff on agricultural fields arises when rainfall exceeds infiltration. Excess water ponding in and flowing through local microtopography increases the hydrological connectivity of fields. In turn, an increased level of hydrological connectivity leads to a higher surface runoff flux at the field boundaries. We investigated the functional hydrological connectivity of synthetical elevation fields with varying statistical properties. For this purpose, we developed an object-oriented ponding and redistribution model to which Philip's infiltration model was coupled. The connectivity behaviour is determined by the presence of depressions with a large area and spatial organization of microtopography in rills or channels. The presence of microdepressions suppresses the effect of the spatial variation of infiltration properties. Connectivity behaviour of a field with a varying spatial distribution of infiltration properties can be predicted by transforming the unique connectivity function that was defined for a designated microtopography. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：303 / 313

页数：11

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