DOI: 10.5194/hess-19-1857-2015
Scopus记录号: 2-s2.0-84928387675
论文题名: Gravitational and capillary soil moisture dynamics for distributed hydrologic models
作者: Castillo A ; , Castelli F ; , Entekhabi D
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 4 起始页码: 1857
结束页码: 1869
语种: 英语
Scopus关键词: Catchments
; Climate models
; Dynamics
; Moisture
; Runoff
; Soil mechanics
; Soil moisture
; Computational demands
; Distributed hydrologic model
; Distributed modeling
; Dual-pore structure
; Hydrologic modeling
; Linear parameterizations
; Local scale process
; Soil moisture dynamics
; Soils
; capillarity
; catchment
; hydrological modeling
; moisture content
; parameterization
; pixel
; soil moisture
; soil water
英文摘要: Distributed and continuous catchment models are used to simulate water and energy balance and fluxes across varied topography and landscape. The landscape is discretized into computational plan elements at resolutions of 101-103 m, and soil moisture is the hydrologic state variable. At the local scale, the vertical soil moisture dynamics link hydrologic fluxes and provide continuity in time. In catchment models these local-scale processes are modeled using 1-D soil columns that are discretized into layers that are usually 10g'3-10g'1 m in thickness. This creates a mismatch between the horizontal and vertical scales. For applications across large domains and in ensemble mode, this treatment can be a limiting factor due to its high computational demand. This study compares continuous multi-year simulations of soil moisture at the local scale using (i) a 1-pixel version of a distributed catchment hydrologic model and (ii) a benchmark detailed soil water physics solver. The distributed model uses a single soil layer with a novel dual-pore structure and employs linear parameterization of infiltration and some other fluxes. The detailed solver uses multiple soil layers and employs nonlinear soil physics relations to model flow in unsaturated soils. Using two sites with different climates (semiarid and sub-humid), it is shown that the efficient parameterization in the distributed model captures the essential dynamics of the detailed solver. © Author(s) 2015. CC Attribution 3.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78546
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Civil and Environmental Engineering, University of Florence, Florence, Italy; Center for Environmental Sensing and Modeling, Singapore-MIT Alliance for Research and Technology, Singapore, Singapore
Recommended Citation:
Castillo A,, Castelli F,, Entekhabi D. Gravitational and capillary soil moisture dynamics for distributed hydrologic models[J]. Hydrology and Earth System Sciences,2015-01-01,19(4)