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Lanzhou University (2014)

Artifical Recharge for Groundwater Reservoir in Semi Arid Region : Towards Improving Water Resources Exploitation Management

郑跃军;

Titre : Artifical Recharge for Groundwater Reservoir in Semi Arid Region : Towards Improving Water Resources Exploitation Management

Auteur : 郑跃军;

Grade : Doctoral Dissertation 2014

Université : Lanzhou University

Résumé
The most part of Northwest China is located in arid and semi-arid region, in whichthe regional precipitation is less and concentrated, and the most important naturalfactors of water resources shortage is much evaporation. Therefore, using precipitationrunoff effectively while reducing evaporation consumption have scientific and practicalsignificance to alleviate the social development demand for water resources and tomaintain the stability of ecological system.This article chooses Wulabo basin of Urumqi River Basin as the study area.Starting from the cyclic evolution of water resources, and based on the thought ofcombined use of surface water and groundwater and on the prerequisite of meetingwater resources supply-demand balance, the water resources development andutilization mode of underground reservoir substituting shallow surface reservoir in plainis studied by using the system science method and the groundwater simulationtechnology.Based on the analysis of long time series runoff characteristics and regionalhydrogeology conditions, the hydrological cyclic rules of study area is summarized andthe problems existing in process of development and utilization of water resources isclarified. On the basis of analysis topography, soil type, groundwater depth, aquifermedia and permeability, the best area of artificial recharge of groundwater is determinedby using expert evaluation method and the GIS technology, and groundwater numericalsimulation model is established. Based on the scheme of artificially controlling rechargearea and recharge process, the change of underground water system in the three kinds ofartificial control infiltration modes is simulated, and the optimal scheme of artificialrecharge is determined by comparing the characteristics of regional evaporation, springoverflow quantity, groundwater storage changes and others under the three conditions.The main conclusions of the study are shown as follow. In the existing waterresources development and utilization mode, making the artificial water channel andplain reservoir as the main body is the important reason for causing the reduction ofregional groundwater recharge and the degeneration of ecological environment. In thestudy area, from June to September, the surplus water, which is an important resource toincrease groundwater recharge, is about1.3×108m3/a. Priority supply section andalternative supply section are located in the valley. Their lengths are respectively6.4km,7.2km, and the river width is about1km. Their supply areas are respectively5.0km2, 5.5km2, and total area is about10.5km2. Under the present water resourcesdevelopment and utilization mode, an average annual reduction of groundwater storagewill be0.08×108m3/a. In three artificial control supply schemes, the Daxigou reservoiras a storage reservoir, which is recharged by selected supply sections in different periods,is the optimal scheme. The groundwater storage capacity increased at an annual rate ofabout0.67×108m3/a. The average annual amount of spring overflow reduces about0.02×108m3/a. An annual reduction of the groundwater evaporation is about0.01×108m3/a.This study can provide reference for the water resources development andutilization in the arid and semi-arid region of Northwest China

Mots clés : Wulabo; groundwater reservoir; shallow surface reservoir; arid and semi-aridregion;

Présentation (CNKI)

Page publiée le 19 novembre 2017