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The Assessment of Green Water Based on the SWAT Model: A Case Study in the Hai River Basin, China

1
School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
2
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
3
Uni Research Climate, Bjerknes Centre for Climate Research, Jahnebakken 5, 5007 Bergen, Norway
*
Authors to whom correspondence should be addressed.
Water 2018, 10(6), 798; https://doi.org/10.3390/w10060798
Received: 12 April 2018 / Revised: 20 May 2018 / Accepted: 14 June 2018 / Published: 16 June 2018
(This article belongs to the Section Hydrology)
Green water accounts for two-thirds of precipitation, and the proportion could be even higher in dry years. Conflicts between water supply and demand have gradually become severe in the Hai River Basin (HRB) due to the socio-economic development. Thus, the exploitation and the utilization of green water have attracted increasing attention. By gathering the related hydrological, meteorological, and geographic data, the spatiotemporal distribution of green water in HRB and the impacts of land use types on green water are analyzed based on the SWAT (Soil and Water Assessment Tool) model in this study. Furthermore, three new indices are proposed for evaluation, including the maximum possible storage of green water (MSGW), the consumed green water (CGW), and the utilizable green water (UGW). The results show that (1) the MSGW is relatively low in plain areas and its spatial distribution is significantly associated with the soil type; (2) according to the evaluation results of CGW and UGW in HRB, a further improvement of utilization efficiency of green water could be achieved; (3) in general, the utilization efficiency of precipitation in farmlands is higher than other land use types, which means that the planting of appropriate plants could be helpful to enhance the utilization efficiency of green water. Our results summarize the spatiotemporal distribution of green water resource and provide a reference for water resources management in other water-short agricultural areas. View Full-Text
Keywords: maximum possible storage of green water; consumed green water; utilizable green water; water-deficient maximum possible storage of green water; consumed green water; utilizable green water; water-deficient
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Zhu, K.; Xie, Z.; Zhao, Y.; Lu, F.; Song, X.; Li, L.; Song, X. The Assessment of Green Water Based on the SWAT Model: A Case Study in the Hai River Basin, China. Water 2018, 10, 798.

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