DOI: 10.5194/hess-18-3623-2014
Scopus记录号: 2-s2.0-84907045076
论文题名: Evaluating digital terrain indices for soil wetness mapping-a Swedish case study
作者: Ågren A ; M ; , Lidberg W ; , Strömgren M ; , Ogilvie J ; , Arp P ; A
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 9 起始页码: 3623
结束页码: 3634
语种: 英语
Scopus关键词: Digital terrain
; Soil wetness
; Swedishs
; bearing capacity
; digital elevation model
; digital terrain model
; landform
; reliability analysis
; soil moisture
; streamflow
; topographic mapping
英文摘要: Trafficking wet soils within and near stream and lake buffers can cause soil disturbances, i.e. rutting and compaction. This-in turn-can lead to increased surface flow, thereby facilitating the leaking of unwanted substances into downstream environments. Wet soils in mires, near streams and lakes have particularly low bearing capacity and are therefore more susceptible to rutting. It is therefore important to model and map the extent of these areas and associated wetness variations. This can now be done with adequate reliability using a high-resolution digital elevation model (DEM). In this article, we report on several digital terrain indices to predict soil wetness by wet-area locations. We varied the resolution of these indices to test what scale produces the best possible wet-areas mapping conformance. We found that topographic wetness index (TWI) and the newly developed cartographic depth-to-water index (DTW) were the best soil wetness predictors. While the TWI derivations were sensitive to scale, the DTW derivations were not and were therefore numerically robust. Since the DTW derivations vary by the area threshold for setting stream flow initiation, we found that the optimal threshold values for permanently wet areas varied by landform within the Krycklan watershed, e.g. 1-2 ha for till-derived landforms versus 8-16 ha for a coarse-textured alluvial floodplain. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78137
Appears in Collections: 气候变化事实与影响
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作者单位: Dept. of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeä, Sweden; Dept. of Soil and Environment, Swedish University of Agricultural Sciences, P.O. Box 7014, Uppsala, Sweden; Forest Watershed Research Centre, Faculty of Forestry and Environmental Management, 28 Dineen Drive, Fredericton, NB, Canada
Recommended Citation:
Ågren A,M,, Lidberg W,et al. Evaluating digital terrain indices for soil wetness mapping-a Swedish case study[J]. Hydrology and Earth System Sciences,2014-01-01,18(9)