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Open AccessArticle

The Application of a Modified Version of the SWAT Model at the Daily Temporal Scale and the Hydrological Response unit Spatial Scale: A Case Study Covering an Irrigation District in the Hei River Basin

by Zheng Wei 1,2,*, Baozhong Zhang 1,2,*, Yu Liu 1,2 and Di Xu 1,2
1
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
2
National Center of Efficient Irrigation Engineering and Technology Research, Beijing 100048, China
*
Authors to whom correspondence should be addressed.
Water 2018, 10(8), 1064; https://doi.org/10.3390/w10081064
Received: 1 May 2018 / Revised: 20 July 2018 / Accepted: 31 July 2018 / Published: 10 August 2018
(This article belongs to the Special Issue Innovation Issues in Water, Agriculture and Food)
As a well-built, distributed hydrological model, the Soil and Water Assessment Tool (SWAT) has rarely been evaluated at small spatial and short temporal scales. This study evaluated crop growth (specifically, the leaf area index and shoot dry matter) and daily evapotranspiration at the hydrological response unit (HRU) scale, and SWAT2009 was modified to accurately simulate crop growth processes and major hydrological processes. The parameters of the modified SWAT2009 model were calibrated using data on maize for seed from 5 HRUs and validated using data from 7 HRUs. The results show that daily evapotranspiration, shoot dry matter and leaf area index estimates from the modified SWAT2009 model were satisfactory at the HRU level, and the RMSE values associated with daily evapotranspiration, shoot dry matter, and leaf area index were reduced by 17.0%, 1.6%, and 71.2%, compared with SWAT2009. Thus, the influences of various optimal management practices on the hydrology of agricultural watersheds can be effectively assessed using the modified model. View Full-Text
Keywords: calibration; irrigation district; evapotranspiration; crop growth; validation calibration; irrigation district; evapotranspiration; crop growth; validation
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Wei, Z.; Zhang, B.; Liu, Y.; Xu, D. The Application of a Modified Version of the SWAT Model at the Daily Temporal Scale and the Hydrological Response unit Spatial Scale: A Case Study Covering an Irrigation District in the Hei River Basin. Water 2018, 10, 1064.

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