Analytical solutions and sensitivity analyses for sediment transport in WEPS
Analytical solutions and sensitivity analyses for sediment transport in WEPS
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DOI：
10.13031/2013.13334
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发表时间：
1999-11-01
期刊：
影响因子：
--
通讯作者：
Skidmore, EL
中科院分区：
文献类型：
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作者：
Hagen, LJ;Wagner, LE;Skidmore, EL
风蚀预测系统 (WEPS) 是一种基于流程的每日时间步长模型，可模拟天气和现场条件。当风速超过阈值时，WEPS 的侵蚀子模型会每小时模拟土壤流失和沉积。本研究的目标是：（1）以允许解析解的方式组装侵蚀过程方程； (2) 开发均匀表面的解析解； (3) 使用线性灵敏度测试评估这些解决方案中参数的响应。基于质量守恒定律，建立了跃变/蠕变放电准稳态方程的解析解。该方程模拟两个源（松散物质的夹带和土块和地壳磨损物质的夹带）和三个汇（跃迁/蠕变破坏至悬浮尺寸、跃迁/蠕变的捕获以及植物茎的拦截）。还开发了一种用于悬浮液成分水平排放的分析解决方案。该方程模拟了三个来源（松散材料的夹带、土块和地壳磨损材料的夹带以及跃移/蠕变破坏至悬浮尺寸）。模拟方程的敏感性检验表明，风蚀土壤流失对风速和表土含水量最为敏感。
The Wind Erosion Prediction System (WEPS) is a process-based, daily time-step model that simulates weather and field conditions. When wind speed exceeds the threshold, the EROSION submodel of WEPS simulates soil loss and deposition on a sub-hourly basis. The objectives of this study were to: (1) assemble the erosion process equations in a manner that allows analytic solutions; (2) develop analytic solutions for a uniform surface; and (3) evaluate the response to parameters in these solutions using linear sensitivity tests. Based on the principle of conservation of mass, an analytic solution was developed for a quasi-steady state equation of the saltation/creep discharge. This equation simulates two sources (entrainment of loose material and entrainment of material abraded from clods and crust) and three sinks (breakage of saltation/creep to suspension-size, trapping of saltation/creep, and interception by plant stalks). An analytic solution also was developed for the horizontal discharge of the suspension component. This equation simulates three sources (entrainment of loose material, entrainment of material abraded from clods and crust, and breakage of saltation/creep to suspension-size). Sensitivity tests of the simulation equations showed that soil loss by wind erosion was most sensitive to wind speed and surface-soil moisture content.