Development of a simple lateral preferential flow model with steady state application in hillslope soils
Development of a simple lateral preferential flow model with steady state application in hillslope soils
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DOI：
10.1029/2004wr003877
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发表时间：
2005-12
影响因子：
5.4
通讯作者：
D. Tsutsumi;R. Sidle;K. Kosugi
中科院分区：
文献类型：
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作者：
D. Tsutsumi;R. Sidle;K. Kosugi
建立了描述带土管坡面三维横向优先流的通用模型。将母体流和管状流视为独立的流动系统，分别采用控制方程(Richards方程和Manning方程)进行计算，同时考虑了这两个流动系统之间的相互作用。该模型同时考虑了部分填满和完全填满的管道水流、进入管道的渗流以及从管道进入周围土壤基质的回流。对早期实验室实验中概述的条件进行了模拟，包括管道内不同的内部粗糙度配置。对于土壤管道内不同的粗糙度单元，模拟了稳态条件下的地下水位和优先流，以前的模型没有模拟过这样的条件。还模拟了六种不同的管路布置：无管(均匀基质流)、单直管、两组不连续管、分支管和不开口管。分支管道的流量最大，即使是未开通的管道，与无管道模拟相比，总流量也有所增加。这些仿真验证了该模型在稳态条件下的通用性，尽管该模型也可以应用于暂态条件。
A general model describing three‐dimensional lateral preferential water flow in a hillslope with soil pipes was developed. Matrix flow and pipe flow were regarded as separate flow systems and computed using the governing equations (Richards' and Manning's equations, respectively), while simultaneously considering the interaction between these two flow systems. The model accommodates both partially filled and full pipe flow, seepage into the pipe, and backflow from the pipe into the surrounding soil matrix. Simulations were conducted for conditions outlined in an earlier bench‐scale experiment, including differing internal roughness configurations within the pipe. Both groundwater levels and preferential flow under steady state conditions were simulated for different roughness elements within the soil pipe; previous models have not simulated such conditions. Six different pipe arrangements were also simulated: no pipe (uniform matrix flow), single straight pipe, two sets of discontinuous pipes, branched pipes, and unopened pipe. Branched pipes had the highest discharge, and even the unopened pipe contributed to an enhanced total discharge compared to the no pipe simulation. These simulations demonstrated the versatility of the model under the steady state conditions, although the model can also be applied to transient conditions.