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首页> 外文会议>Asian conference on remote sensing;ACRS >Mapping Land Subsidence of Krishna - Godavari Basin using Persistent Scatterer Interferometry Technique
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Mapping Land Subsidence of Krishna - Godavari Basin using Persistent Scatterer Interferometry Technique

机译：持久散射干涉法绘制克里希纳-戈达瓦里盆地地面沉降图。

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摘要

SAR Interferometry (InSAR) is a technique by which a wide area can be mapped for surface deformation. The conventional InSAR technique has limitations due to baseline restriction, atmospheric phase delay and temporal decorrelation. Persistent Scatterer Interferometry (PS1) technique is an advanced InSAR technique, and it mitigates the atmospheric phase delay effect and geometric decorrelation to a large extent by utilizing a stack of interferograms and gives time series deformation with high accuracy. Extraction of oil and natural gas from underground deposits leads to land subsidence. The East coast of Andhra Pradesh (AP) state in Krishna-Godavari basin is most likely to be affected by this phenomena because of extraction of oil and natural gas from its underground reservoirs for the last two decades. In this paper, an attempt is made to know how the urban cities in this region are affected due to land subsidence using PSI technique. For this, two coastal test areas are selected and ALOS-1 PALSAR datasets from 2007 to 2011 comprising of 11 and 13 scenes are processed using PSI technique. Although the area predominantly agriculture, small villages, towns and cities provide adequate Persistent Scatterers (PS). From the results, land deformation rates of different cities in test area are observed. The subsidence rate of Palakollu town is -20 mm/year and Kakinada city is around -14 mm/year. Narsapur town is showing 4mm/year upliftment because it has more prospect of groundwater recharge from river Godavari.
机译：SAR干涉测量法（InSAR）是一种技术，通过它可以绘制大面积的表面变形。由于基线限制，大气相位延迟和时间去相关，传统的InSAR技术具有局限性。持久散射干涉仪（PS1）技术是一种先进的InSAR技术，它利用一堆干涉图在很大程度上减轻了大气相位延迟效应和几何相关性，并提供了高精度的时间序列变形。从地下沉积物中提取石油和天然气会导致地面沉降。克里希纳-戈达瓦里盆地的安得拉邦东海岸（AP）最有可能受到这种现象的影响，因为最近二十年来从其地下储层中提取了石油和天然气。本文尝试使用PSI技术了解该地区的城市由于地面沉降而受到的影响。为此，选择了两个沿海测试区域，并使用PSI技术处理了2007年至2011年的ALOS-1 PALSAR数据集，其中包括11个场景和13个场景。尽管该地区以农业为主，但小村庄，城镇和城镇提供了足够的持久性散射体（PS）。从结果可以观察到试验地区不同城市的土地变形率。 Palakollu镇的沉降速度为-20毫米/年，而Kakinada市的沉降速度约为-14毫米/年。 Narsapur镇正在显示每年4毫米的隆起，因为它具有从Godavari河回灌的地下水的更多前景。

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