Up-scaling surface runoff from plot to catchment scale
Up-scaling surface runoff from plot to catchment scale
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DOI：
10.2166/nh.2012.057
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发表时间：
2012-01-01
影响因子：
2.7
通讯作者：
Weingartner, R.
中科院分区：
文献类型：
--
作者：
Alaoui, A.;Spiess, P.;Weingartner, R.
本研究的主要目的是利用基于现场喷洒试验的数字高程模型(TauDEMS)，在小区尺度上识别和描述水流过程，并通过地形分析在流域尺度上放大这些过程。为了在小区尺度上校准基于TauDEM的方法，在两个小区尺度上进行了现场喷洒试验(16m(2)分成16个1m(2)的不同坡度的小区)。森林土壤和草原土壤在质地和结构孔隙度上的显著差异似乎控制着径流过程。草地土壤的地下径流主要依赖于田间坡度，而深层渗漏主要存在于森林土壤中。此外，水流方向图还表明，两个因素起着重要作用：一方面，易受地表径流影响的区域的空间顺序；另一方面，渠道的曲折程度和长度，这些因素提高了目标出口的累积水量。当基于喷洒试验时，基于TauDEM的方法提供了更多关于集水区尺度上的水流动态的定量信息。此外，还需要更多的调查来验证更大范围内的流动计算。
The main aims of this study were to identify and characterize the flow processes at the plot scale, and to up-scale these processes at the catchment scale by Terrain Analysis, using Digital Elevation Models (TauDEMs) based on in-situ sprinkling experiments. To calibrate the TauDEM-based method at the plot scale, in-situ sprinkling experiments were carried out on two plot scales (16 m(2) divided into 16 plots of 1 m(2) on various slopes). The marked differences in the textural and structural porosities between forest and grassland soil appear to control runoff processes. While grassland soils were characterized by a variable subsurface flow depending mainly on field slope, deep percolation was mainly found in forest soils. In addition, the map of flow directions also shows that two factors play an important role: on the one hand, the spatial sequence of the areas with a predisposition to surface runoff, and on the other, the tortuosity and length of channels that enhance the cumulative water volume in the target outlets. When based on sprinkling experiments, the TauDEM-based method provides more quantitative information on the dynamic of flow at the catchment scale. Furthermore, additional investigations are needed to validate the calculations of flow at a larger scale.