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Northwest A&F University (2021)

Multi-scale Optimal Allocation of Water Resources in Drought Periods Based on SWAT-MODFLOW

康燕楠

Titre : Multi-scale Optimal Allocation of Water Resources in Drought Periods Based on SWAT-MODFLOW

Auteur : 康燕楠

Grade : Master 2021

Université : Northwest A&F University

Résumé partiel
In large-scale irrigation areas in arid and semi-arid areas in Northwest my country,surface water sources cannot meet the needs of agricultural development,production and life.Groundwater has become the main water source to meet the needs of production activities in the irrigation areas,resulting in significant reduction of groundwater and long-term failure to restore and replenish.When droughts continue to occur,the amount of natural replenishment from precipitation is reduced,and the contradiction between water supply and demand becomes more prominent,making agricultural water use often unsatisfied,which has a huge impact on agricultural production,often resulting in reduced or even no harvest of grain,which seriously affects the local economy.Social development.For this reason,reasonable allocation of the limited water resources in the region is one of the effective ways to solve the above problems and maximize the benefits of water resources.The Jinghuiqu Irrigation District in Shaanxi Province is a typical canal and well combined irrigation area.In the early stage of meteorological drought,water diversion from the Jing River can be used to deal with drought,and the continuous occurrence of drought can use groundwater as an emergency drought-resistant water source to alleviate the adverse effects of drought.Therefore,in this study,the Jinghuiqu irrigation area and the upper reaches of Zhangjiashan of the Jing River were selected as the study area,and the surface water SWAT and groundwater model MODFLOW were constructed.Finally,a multi-objective coupling simulation optimization model was constructed based on FloPy-Pymoo,and the limited surface water Reasonable allocation of groundwater that can be used for drought and emergency response can not only effectively alleviate the contradiction between water supply and demand during drought periods,reduce the adverse economic and social impact of drought,but also provide technical support for the sustainable,efficient and safe use of water resources in irrigation areas.The research has reached the following conclusions :(1)The intra-annual and inter-annual changes of rainfall,temperature,and evaporation in Jinghuiqu Irrigation District pointed out that the precipitation in the irrigation area is showing a downward trend,while the temperature and evaporation show an upward trend.60%of precipitation and 53%of evaporation are concentrated in the flood season 6-9 Months,and the temperature is above 19℃.The inter-annual variation of Jinghe River surface water and groundwater in the irrigation area pointed out that the annual runoff of the upper Jinghe River Basin,the amount of water diversion from agricultural irrigation at the head of the canal,and the amount of groundwater that can be extracted show a downward trend.There will be continued shortages,causing the groundwater level in some areas to continue to drop.The SPI index is used to reflect the drought situation,indicating that the irrigation area is under the threat of drought for a long time,and the impact is increasing year by year.

Mots clés : SWAT ;multi-objective optimization ;NSGA-Ⅲ ;FloPy;Pymoo ;coupled model ;

Présentation (CNKI)

Page publiée le 13 novembre 2021