Journal
ENVIRONMENTAL MODELLING & SOFTWARE
Volume 109, Issue -, Pages 329-341Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envsoft.2018.08.024
Keywords
Land surface processes; Soil water; Modeling; Richards equation
Categories
Funding
- NASA [NNX17AE66G, NNH13ZDA001N]
- USDA [2017-67003-26485]
- NSF INFEWS [1639327]
- USDA Natural Resources Conservation Service - Conservation Effects Assessment Project (NRCS-CEAP)
- NASA [NNX17AE66G, 1002471] Funding Source: Federal RePORTER
- Directorate For Geosciences
- Division Of Earth Sciences [1639327] Funding Source: National Science Foundation
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A Richards-equation-based soil moisture module was developed and integrated within the Soil and Water Assessment Tool (SWAT). Four years of daily soil moisture measurements from 10 monitoring stations at three depths (i.e., 5, 10, and 50 cm) in the Choptank River watershed, Maryland, were used to test the module performance. Results show that, as compared with the original SWAT soil moisture module, the Richards-equation-based soil moisture module improved R-2 from 0.12 to 0.45 and reduced soil moisture simulation bias (mean [simulation] -mean[measurement]) from -0.10 to -0.02 (m(3) m(-3)), averaged across the 10 stations at soil surface layer (i e., 5 cm depth). Noticeable improvements were also observed for deeper soil layers, and for both dry and wet periods. Notably, the soil moisture coupling strength between different soil layers was substantially improved with the new module. The enhanced SWAT model is expected to better inform soil water and irrigation management.
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