Dynamic Change in the Water-Level Fluctuation Zone of the Danjiangkou Reservoir and Its Influence on Water Quality

Jie Yin, Hai Liu and Xiaoling Chen
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Jie Yin: Faculty of Resources and Environment Science, Hubei University, Wuhan 430062, China
Hai Liu: Faculty of Resources and Environment Science, Hubei University, Wuhan 430062, China
Xiaoling Chen: State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China

Sustainability, 2018, vol. 10, issue 4, 1-17

Abstract: The water-level fluctuation zone (WLFZ) of the Danjiangkou Reservoir is the last barrier to ensure the water quality of the middle route of the South-North Water Diversion (SNWD) Project and has therefore received widespread attention. Based on the 17-year serial dynamics of the Danjiangkou Reservoir WLFZ extracted from satellite images from 2000 to 2016, this study analyzed the annual and inter-monthly changes in inundation area as well as the non-flooded area within the WLFZ. The first comprehensive map of the temporal and spatial nitrogen ( N ) and phosphorus ( P ) release characteristics of the Danjiangkou Reservoir WLFZ is presented. The results showed that the inundation area underwent a significant increasing trend during this period, and the WLFZ was more frequently affected by off-season alternative drying-wetting than before the water diversion. The total amounts of N and P released into the water from the WLFZ soil layer are considerable (7.6 tons of P and 301.2 tons of N per year) and increasing. Optimizing land use in the WLFZ is an important means to ensure water quality in the Danjiangkou Reservoir and the sustainability of the SNWD Project.

Keywords: water-level fluctuation zone; dynamic process; Danjiangkou Reservoir; remote sensing; water quality (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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