Water Resources System Resilience Assessment Of Jinghuiqu Irrigation District Based On WEAP-MODFLOW

Jinghuiqu Irrigation District is an important grain base in my country,which provides an important guarantee for my country’s grain security.But at the same time,it is also the most sensitive area to the impact of climate change and is more affected by natural disasters.From the perspective of disaster science and natural disaster risk formation mechanism,the occurrence of any disaster is the result of the joint action of hazard factors,disaster-pregnant environment and disaster-bearing body.The extent of the disaster-bearing body is not only related to the intensity of the hazard factor,but also largely depends on the resilience of the disaster-bearing body.The resilience of the irrigation area’s water resources system is closely linked to the evaluation of the irrigation area’s ability to resist drought.Therefore,analyzing and quantifying the resilience of water resources systems in irrigation districts can lay the foundation for irrigation district water conservancy facilities planning,irrigation district drought planning and drought risk management.This study introduced the concept of resilience of water resources system based on the WEAP-MODFLOW coupling model to quantitatively calculate the resilience of the water resources system in the Jinghuiqu irrigation area of Shaanxi Province against drought,and proposed a new method to evaluate the drought resistance of the irrigation area.In defining the water resources of the irrigation area.On the basis of the concept and connotation of system resilience,considering the ability of the irrigation area’s water resources system to recover from drought conditions,the previous quantification of resilience was insufficient in the evaluation of resilience.Taking the Jinghuiqu Irrigation District in Shaanxi Province as an example,based on WEAP-MODFLOW,the irrigation district water resources system model was constructed,combined with the resilience quantification method,the resilience of each irrigation area was quantitatively calculated,and the resilience improvement strategy of each subregion was carried out considering multiple scenarios.The main findings are as follows:(1)The connotation of the resilience of the water resources system in the irrigation area is extended.According to the concept of physical resilience,combined with the characteristics of the water resources system of the irrigation area,the anti-disturbance and resilience of the water resources system are also considered.This study defines the resilience of the irrigation area’s water resources system as the ability to restore the structure,function,and characteristics of the water resources system itself to a stable state through system self-regulation when agricultural production and related water resources systems in the irrigation area are subject to external disturbances.(2)Constructed a WEAP-MODFLOW coupling model for Jinghuiqu irrigation area.The coupling model constructed based on WEAP-MODFLOW can realize the joint simulation of canal and well combined with surface water and groundwater in the irrigation area,and analyze the influencing factors and improvement strategies of the water resources system resilience of the irrigation area through different scenarios and management schemes established under the drought background.Based on the results of simulation calculations,indicators representing the supply and demand status of the irrigation area’s water resources system are proposed.Combined with the quantitative method of the irrigation area’s water resources system resilience,a framework for evaluating the resilience of the irrigation area’s water resources system is established.Through the evaluation system of resilience of water resources system,effective resilience improvement strategies can be identified,which provides data support for water resources allocation in irrigation areas.(3)Analyzed effective strategies to improve the resilience of water resources system in Jinghuiqu Irrigation District.The resilience of the water resources system in the irrigation area is affected by a number of factors.The areas with the highest water supply priority and the larger proportion of cultivated land generally have higher resilience.The water supply method is also one of the main factors affecting the resilience of the water resources system in the irrigation area.With the addition of groundwater supply methods,the overall resilience of the irrigation area’s water resources system has been significantly improved,and the resilience improvement rate for regions with lower original resilience values is greater.Among them,there is little difference in resilience improvement results under the water supply modes of surface water priority and groundwater priority;the water supply scheme of alternating surface water and groundwater priority irrigation has the strongest ability to improve the overall resilience of the irrigation area,and the regional resilience improvement rate is up to 30%,respectively for the surface Water priority water supply method and groundwater priority water supply method 1.92 times and 1.67 times.(4)The effectiveness of the strategy to improve the resilience of the water resources system in Jinghuiqu Irrigation District was discussed.The effectiveness of the resilience improvement strategy is related to the region.Comparing the impact of different water resources system resilience improvement strategies on the resilience of the irrigation area’s water resources system,there are differences.Under the priority water supply method of surface water and groundwater,the C22 region has the largest resilience improvement capacity,which is improved.The rates are 16% and 18%,respectively.Under the priority irrigation water supply mode of surface water and groundwater,the C23 region has the largest resilience improvement capacity,with an improvement rate of 29%.