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The characteristics and evolution of surface deformation induced by agricultural irrigation in the Junggar Basin from the perspective of InSAR

  • role： First author第一作者
  • Affiliation：

    School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

    Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education, School of Geoscience and Infophysics,Central South University, Changsha 410083, China

    Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha 410083, China

  • Email：wanghaiyan@csu.edu.cn
  • Introduction：王海艳，1993年生，女，硕士研究生，研究方向为农业区地表形变监测。E-mail：wanghaiyan@csu.edu.cn
WANG Haiyan123,  
  • role： Corresponding author通信作者
  • Affiliation：

    School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

    Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education, School of Geoscience and Infophysics,Central South University, Changsha 410083, China

    Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha 410083, China

  • Email：fredgps@csu.edu.cn
  • Introduction：冯光财，1981年生，男，副教授，研究方向为InSAR在地震、滑坡、城市沉降等灾害方面的监测与反演。E-mail：fredgps@csu.edu.cn
FENG Guangcai123*,  
  • Affiliation：

    School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

    Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education, School of Geoscience and Infophysics,Central South University, Changsha 410083, China

    Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha 410083, China

MIAO Lu123,  
  • Affiliation：

    School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

    Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education, School of Geoscience and Infophysics,Central South University, Changsha 410083, China

    Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha 410083, China

TAN Ji123,  
  • Affiliation：

    School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

    Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education, School of Geoscience and Infophysics,Central South University, Changsha 410083, China

    Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha 410083, China

XIONG Zhiqiang123

résumé

Land subsidence disasters in excessively exploited cultivation areas are caused by groundwater-dependent irrigation, which has a strong influence on the rapid decline of water table, especially in arid and semiarid regions. Many depression cones appeared in the agricultural districts in Junggar Basin, due to groundwater overexploitation, over developed crop production, and large water consumption. However, the land subsidence information in this basin is limited.Interferometric Synthetic Aperture Radar (InSAR) technology, which has emerged in recent years, has been widely used in monitoring agricultural irrigation settlement, benefiting from its high precision, high resolution and wide temporal and spatial coverage. Small Baseline Subset (SBAS) algorithm selects high-quality image pairs obtained via D-InSAR after setting the threshold of time base and space baseline. In order to investigate the characteristics and evolution of the surface deformation induced by groundwater-dependent irrigation, we obtained the deformation information on the southern margin of the Junggar Basin and northern foothills of the Tianshan Mountains using ENVISAT/ASAR data (descending and ascending tracks) covering Hutubi County from 2003 to 2010. Data were processed utilizing time series InSAR technology based on GAMMA software and SBAS-InSAR technology.Results from two different tracks are consistent, which show two subsidence funnels were formed in the field area after 2007. In the study area, the traditional irrigation method and clockwise irrigation system may cause average subsidence rates of 50 and 30 mm/y, respectively. The subsidence rate of the traditional irrigation method shows a linear trend over time, while that of the clockwise irrigation system is closely related to the season. In winter, the ground uplift in the area with clockwise irrigation is approximately 40 mm, which is significantly larger than that of the field area with the traditional irrigation method. In summer, the land subsidence rate caused by the clockwise irrigation system was 200 mm/y.Therefore, groundwater overexploitation in agricultural irrigation is the major factor of land subsidence. Moreover, surface deformation during non-irrigation period is caused by groundwater recharge. Long-term extraction of groundwater for agricultural irrigation induces not only ground displacement but also serious soil salinization, which are unfavorable for crop growth and soil self-repair. Therefore, changing irrigation methods and improving the utilization of water resources are crucial. Spatial and temporal variation characteristics of land subsidence can provide a theoretical reference for the sustainable development of water resources and agriculture.

mots-clés

remote sensing;agricultural irrigation;surface deformation;InSAR;groundwater;Junggar Basin

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