Academic Journal
Gravitational and capillary soil moisture dynamics for distributed hydrologic models
| العنوان: | Gravitational and capillary soil moisture dynamics for distributed hydrologic models |
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| المؤلفون: | A. Castillo, F. Castelli, D. Entekhabi |
| المصدر: | Hydrology and Earth System Sciences, Vol 19, Iss 4, Pp 1857-1869 (2015) |
| بيانات النشر: | Copernicus Publications, 2015. |
| سنة النشر: | 2015 |
| المجموعة: | LCC:Technology LCC:Environmental technology. Sanitary engineering LCC:Geography. Anthropology. Recreation LCC:Environmental sciences |
| مصطلحات موضوعية: | Technology, Environmental technology. Sanitary engineering, TD1-1066, Geography. Anthropology. Recreation, Environmental sciences, GE1-350 |
| الوصف: | 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 10−3–10−1 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. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1027-5606 1607-7938 |
| Relation: | http://www.hydrol-earth-syst-sci.net/19/1857/2015/hess-19-1857-2015.pdf; https://doaj.org/toc/1027-5606; https://doaj.org/toc/1607-7938 |
| DOI: | 10.5194/hess-19-1857-2015 |
| URL الوصول: | https://doaj.org/article/5771d69f664f4b1487c19a41f4758533 |
| رقم الانضمام: | edsdoj.5771d69f664f4b1487c19a41f4758533 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 10275606 16077938 |
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| DOI: | 10.5194/hess-19-1857-2015 |