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    Land subsidence assessment under excessive groundwater pumping using ESA Sentinel-1 satellite data: a case study of Konya Basin, Turkey
    (Springer, 2021) Yesilmaden, Hande Mahide; Inan, Cagri Alperen; Kurtulus, Bedri; Canoglu, Mustafa Can; Avsar, Ozgur; Razack, Moumtaz
    Land subsidence analysis using satellite imagery is a consequential subject. Earth scientists have begun utilizing satellite imagery as an alternative to in-situ measurements and conceptual models. Synthetic aperture radar (SAR) images, moreover, utilize the reformer approach more than traditional satellite imagery with the use of high-resolution radar images. As a natural hazard, land subsidence is mostly attributed to excessive groundwater extraction, which is also the main reason for choosing the Konya Plain in Turkey as the study area for the present work. Since the Konya region is an agricultural and industrial land, groundwater extraction has been a challenging circumstance for the last few years. Change in groundwater level is also correlated with land subsidence rates through hydrogeological conceptualization. In this study, SAR images of the Sentinel 1 satellite are utilized for land subsidence rate calculation with the European Space Agency's SNAP software. Differential SAR interferometry (DInSAR) technique was used, which makes possible to detect deformation on the ground surface of the same portion of the Earth's surface using SAR images. The different acquisitions with DInSAR method allow to create differential interferograms that provide information ground motion with accuracy in cm. Three periods were utilized as 2016-2017, 2017-2018 and 2018-2019 the mean land subsidence rates were calculated for each period as 2.2, 1.4 and 1.7 cm/year, respectively. In the sum of the 3-year period, the maximum subsidence value went up to 16 cm.
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    Öğe
    SOIL-AQUIFER INTERACTIONS AND VADOSE ZONE MODELING: AN EXAMPLE FROM MARAIS POITEVIN (WESTERN FRANCE)
    (Carpathian Assoc Environment And Earth Sciences, 2019) Canoglu, Mustafa Can; Kurtulus, Bedri; Razack, Moumtaz
    Water flux in unsaturated zone is one of the most important phenomenon for determining the recharge characteristics of an aquifer. In-situ measurement and simulation models have been developed in recent years to characterize the recharge process in unsaturated zone. Recently, a mechanistic model named as AgriFlux have been adopted to specify the water fluxes in unsaturated zone. In this study, water flows in the unsaturated zone is investigated in order to understand a global interaction of soil-aquifer exchange system and to simulate the water flux leaching from unsaturated zone of soil and capacitance using AgriFlux model. Input parameters of the model were characterized by in-situ measurement and laboratory works. In-situ measurement were done by auger hole and Porchet test at 36 locations. Within laboratory tests, mineralogy of soil samples is characterized by X ray diffraction (XRD) and grain size distribution is determined on the undisturbed soil sampled from study area. The modelling results reveal that a percolated total water flow leaching through the unsaturated zone. The results were also compared with the observed ground water level fluctuations in the aquifer. Consequently, water flow quantification of a soil - aquifer system in Poitevin Marshland signpost the recharge characteristics of Bri Aquifer.