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Université du Xinjiang (2019)

Combined Utilization Research of Surface Water and Groundwater in Oasis Irrigation District of Southern Margin of Tarim Basin

刘毅;

Titre : Combined Utilization Research of Surface Water and Groundwater in Oasis Irrigation District of Southern Margin of Tarim Basin

Auteur : 刘毅;

Grade : Doctoral Dissertation 2019

Université : Université du Xinjiang

Résumé partiel
How to achieve optimal allocation and efficient use of oasis water resources has always been a key scientific issue in oasis science.More than 90%of the current Xinjiang oasis is used in agricultural irrigation districts.The optimal allocation of oasis water resources is largely reflected in the optimal utilization of water resources in irrigation districts.In the past few decades,due to population growth and economic development pressure,the area of Oasis agricultural irrigation district has continued to expand.The amount of surface water and groundwater resources used in the Oasis Irrigation District is also increasing.How to rationally realize the optimal utilization of water resources in Oasis irrigation area is the key and difficult point of Oasis water resources management.In the mountain-oasis-desert ecosystem,water resources are derived from the surface runoff of melting ice and snow in mountainous areas and are dissipated in oasis agricultural irrigation and desert.When the surface runoff cannot meet the water demand in the irrigation area,groundwater becomes an important supplement.Therefore,the core point of the optimal utilization of water resources in the oasis irrigation area is the joint utilization of groundwater and surface water.This is especially the case in the current expansion of the oasis area,changes in planting structures,and increasingly stringent water constraints(especially groundwater).How to realize the optimal utilization of surface water-groundwater is a key scientific problem facing Xinjiang,especially the southern Xinjiang oasis,and a realistic problem that needs to be solved locally.This paper selects the oasis in the southern margin of the Tarim Basin,which is characterized by poor social economy and oasis water resources management.As an important distribution area of Xinjiang oasis,in the past 30 years,its oasisization process has intensified and the farmland area has been increasing.In the past 10 years,due to the good light and heat resources in southern Xinjiang,the agricultural planting structure in the region has been transformed from traditional wheat,cotton and corn to economic forest fruit.The expansion of farmland area and the change of planting structure have made optimal use of water resources.An urgent need is put forward.Based on the Cele National Field Observation and Research Station located in the central Hetian area of the southern margin of the Tarim Basin,the Cele Oasis is selected as a typical research area.Firstly,the change of the oasis landscape pattern in the past few decades of Cele Oasis is analyzed.Identify the current planting structure,area and layout of the Cele Oasis.Combined with the countermeasures and monitoring analysis of the water consumption characteristics of red jujube and walnut in the main economic crops of Cele Oasis,the water demand of the oasis under the existing planting structure was clarified.Secondly,based on the characteristics of the long-term runoff of the Cele River,the safety threshold of the groundwater resources of the Cele Oasis is analyzed.On the basis of establishing a hydrological model to simulate the groundwater safety threshold,the maximum amount of groundwater exploitation available for the groundwater resources of the Cele Oasis under multiple scenarios is determined.Thirdly,the optimization of water resources in the irrigation area is transformed into the optimal allocation simulation of the groundwater resources that can be mined in Cele Oasis.Irrigation water wells are used to mine groundwater to irrigate farmland irrigation areas.By analyzing the number and distribution characteristics of the existing wells in Cele Oasis,the objective equation with the lowest mining cost is established,and the optimization model is constructed and the optimal well location quantity and spatial layout based on the status quo are analyzed

Mots clés : Oasis; Crop water consumption; Planting structure; Well layout in irrigation area; Optimal configuration;

Présentation (CNKI)

Page publiée le 2 mai 2020