Estimation of ecological water demands and water replenishment regulation for Momoge Wetland
Hongxu MENG , Guoqing WANG , Changlin ZOU , Yanfeng WU , Zhijun LI
Water Resources and Hydropower Engineering ›› 2025, Vol. 56 ›› Issue (9) : 167 -179.
[Objective] Currently, research on the overall scale of the Momoge Wetland remains limited, especially the lack of consideration of the variations in ecological water demand across different periods within a year. To address this, an estimation framework for the wetland ecological water demand indicator system, consisting of five indicators, is developed for Momoge Wetland. [Methods] Based on the established ecological water demand indicator system, the ecological function method was employed to estimate the ecological water demand of Momoge Wetland across three levels and for three time periods. Moreover, the Grey Model(GM) was utilized to predict the wetland area under various hydrological scenarios of water abundance and water scarcity, thereby determining the water replenishment schemes in response to wetland changes of Momoge Wetland. [Results] The result showed that the maximum, suitable, and minimum ecological water demands of Momoge Wetland were 24.14×108 m3, 16.65×108 m3, and 10.88×108 m3, respectively. The water demands for the overwintering period, breeding period, and flood season were 1.92×108 m3, 5.39×108 m3, and 8.73×108 m3, respectively. Based on the predicted wetland area under different scenarios of water abundance and scarcity, the required water replenishment volumes for Momoge Wetland under the four scenarios — dry-dry-dry, dry-dry-normal, dry-normal-dry, and normal-normal-normal — were 0.70×108 m3, 0.49×108 m3, 0.68×108 m3, and 0.36×108 m3, respectively. [Conclusion] In years of water scarcity, existing water replenishment projects fail to meet the water storage requirements of the Momoge Wetland, highlighting the urgent need to implement multi-source water replenishment method to enhance water replenishment efficiency. The calculation result of this study can inform annual and within-year water replenishment schemes and multi-source water regulation for the Momoge Wetland, thereby improving the efficiency of regional water resource utilization and ensuring the stability of the wetland ecosystem.
ecological water demand / ecological water replenishment / water demand classification / indicator system / Momoge Wetland / influencing factors
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