The Response Of The Area Variation Of The Wetland In Gongnaisi Valley Of Yili To Stream Infiltration Recharge

There are many rivers and abundant water resources in the Yili area of Xinjiang.The river type wetland is widely distributed.Wetland is an important part of the ecological environment in this area.However,as the intensity of economic development increases,these wetlands are facing the risk of degradation.In this paper,the formation conditions of the wetland in the valley of the Yili valley are analyzed,and the groundwater flow numerical model is set up in this area,and the changes of the wetland area under the conditions of rainfall and river runoff with different guaranteed rates are predicted.It provides reference for wetland conservation and planning in the study area.The main achievements of the paper are as follows:(1)The distribution of wetland in the study area is controlled by topography,geomorphology,hydrogeological conditions,hydrological conditions and climatic conditions.In terms of topography,wetlands are located in the periphery of the alluvial fan of the Qiapu and the Tekesi River,and alluvial fans play a role in terrain blocking.The infiltration and recharge of the Qiapu river and the Tekesi River elevated the local groundwater level and formed a hydraulic barrier that is conducive to the formation of wetlands.In terms of hydrological conditions,the annual high water level and sufficient runoff inflow ensure the supply of wetlands.In terms of climatic conditions,the wetland area is abundant in sunshine and adequate rainfall,which is suitable for the growth of wetland organisms.(2)I established the groundwater flow numerical model in the study area,and obtained the distributed hydrogeological parameters in the area through the model identification and verification.The parameters of hydrogeological parameters,such as permeability coefficient,water supply and water storage rate,are in agreement with the parameters obtained from the field tests and the parameters obtained from the previous data,which are in accordance with the hydrogeological conditions in the study area.(3)The area of wetlands will continue to decrease and decrease by about 7.974% under the condition of 75% guaranteed rainfall and river runoff for 50 consecutive years.The amount of rainfall and river runoff under the guarantee rate of 50% will continue to decrease for 50 consecutive years,but the reduced area will be smaller and reduce by about 4.831%.And the wetland area will increase by about 5.433% after 50 years under the condition of 25% guaranteed rainfall and river runoff.(4)The infiltration and recharge of the the Qiapu and the Tekesi River in the study area are important conditions for Wetland Preservation.The diversion of the Qiapu and the Tekesi River is huge.If the irrigation methods are improved,the diversion of the Qiapu and the Tekesi River are reduced,and the river supply of the valley is guaranteed,it will be beneficial to the maintenance of the wetland.