期刊
ECOLOGICAL INDICATORS
卷 69, 期 -, 页码 422-433出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecolind.2016.05.006
关键词
Water scarcity; Spatial unit non-overlapping; Hyper-resolution; Yarlung Tsangpo-Brahmaputra River
资金
- National Science and Technology Pillar Program of China [2012BAK12B03, 2012BAJ25B09]
- National Natural Science Foundation of China [41161002, 41261038]
- Governor Special Fund for Outstanding Talents of Science, Technology and Education of Guizhou Province, China [[2011]46]
- Science and Technology Foundation of Guizhou Province, China [[2015]2118]
- Scientific Research Starting Fund for Doctor of Guizhou Normal University
Water scarcity is a serious global problem, and accurate estimations are urgently needed. The Water stress index (WSI) is one of the most commonly used methods for global or large scale water scarcity evaluation, but this method lacks of consideration of water demand and water supply positions non-overlapped spatial distribution, tends to overestimate water stress when applied to a moderate resolution grid (e.g., 1 km). In this study, we used a non-overlapping water supply-and-demand unit approach to improve the calculation scheme and constructed a spatial unit non-overlapping WSI model (Sun-WSI model). We then applied the new model to the Yarlung Tsangpo-Brahmaputra River (TBR) and estimated monthly water stress from 2006 to 2012 with a 1 km spatial resolution. The results showed that the determination coefficient (R-2) between the normalized Drought Index (DI) and water stress was mainly in the range of 0.2-0.7, accounting for 77.4% of the study area. The spatial pattern of water stress estimated by the Sun-WSI model was consistent with the DI. Further analysis showed that both overall and grid water stress estimated by the Sun-WSI model were close to the results from existing studies; however the Sun-WSI model had a higher spatial resolution. With a 1 km resolution, the Sun-WSI model performed better than the conventional WSI with respect to both overall results and spatial details. This suggests that the Sun-WSI model is suitable for evaluating regional or moderate-resolution grid water scarcity. (C) 2016 Elsevier Ltd. All rights reserved.
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