A Generalized Subsurface Flow Parameterization Considering Subgrid Spatial Variability of Recharge and Topography
A Generalized Subsurface Flow Parameterization Considering Subgrid Spatial Variability of Recharge and Topography
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考虑补给和地形次网格空间变化的广义地下流参数化
DOI：
10.1175/2008jhm936.1
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发表时间：
2008
影响因子：
3.8
通讯作者：
L. Leung
中科院分区：
文献类型：
--
作者：
Maoyi Huang;Xu Liang;L. Leung
地下流是重要的水文过程，是水收支的重要组成部分。通过对土壤湿度的直接影响，它可以影响地表的水和能量通量，影响区域气候和水循环。在本研究中，提出了一种新的地下流动公式，该公式结合了地形和补给的空间变异性。通过理论推导和实例研究表明，幂律参数化和指数参数化以及Woods等人提出的参数化都是新公式的特殊情况。使用新公式计算的地下流量与在宾夕法尼亚州Tulpehocken Creek和爱荷华州Walnut Creek的观测值进行了很好的比较。敏感性研究表明，当地形空间变异性或补给空间变异性增加时，上述两个地点和新西兰麦麦山坡的地下流量增加。这可能是由于……
Abstract Subsurface flow is an important hydrologic process and a key component of the water budget. Through its direct impacts on soil moisture, it can affect water and energy fluxes at the land surface and influence the regional climate and water cycle. In this study, a new subsurface flow formulation is developed that incorporates the spatial variability of both topography and recharge. It is shown through theoretical derivation and case studies that the power-law and exponential subsurface flow parameterizations and the parameterization proposed by Woods et al. are all special cases of the new formulation. The subsurface flows calculated using the new formulation compare well with values derived from observations at Tulpehocken Creek, Pennsylvania, and Walnut Creek, Iowa. Sensitivity studies show that when the spatial variability of topography or recharge, or both is increased, the subsurface flows increase at the two aforementioned sites and at the Maimai hillslope, New Zealand. This is likely due to...