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Remote Sensing for Land & Resources    2020, Vol. 32 Issue (2) : 186-195     DOI: 10.6046/gtzyyg.2020.02.24
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Quantitative analysis of uneven subsidence by Moran’s I and cross wavelet
Yike SUN1,2,3, Huili GONG1,2,3(), Beibei CHEN1,2,3, Chaofan ZHOU1,2,3,4, Wenfeng CHEN5, Xiaojing ZHANG1,2,3
1. Key Lab of 3D Information Acquisition and Application, Ministry of Education, Beijing 100048, China
2. The State Key Laboratory Breeding Base of Process of Urban Environment and Digital Simulation, Beijing 100048, China
3. School of Resources Environment and Tourism, Capital Normal University, Beijing 100048, China
4. Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing 100048, China
5. Qinghai-Tibet Plateau Research Institute, Chinese Academy of Sciences, Beijing 100101, China
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Abstract  

To address the problem that quantitative analysis of uneven subsidence is rare, the authors used the Permanent Scatterer Interferometry (PSI) to monitor land subsidence in the Beijing plain. According to the different shallow surface spatial utilizations, the authors selected 5 typical areas in the subsidence funnel region. Based on spatial autocorrelation analysis and wavelet analysis, the authors quantified the degree of spatial and annual time series uneven subsidence in each area, and studied the influence of different shallow surface spatial utilization and groundwater level variation on spatial and annual time series uneven subsidence. The results are as follows: ①Annual time series subsidence’s Moran index degrees of 5 areas are the same as those of the accumulated subsidence: I5>I3>I1>I2>I4. According to the utilization of shallow surface space, the degree of uneven subsidence of 1, 2, 5 areas are positively correlated with the complexity of space utilization, and the factors affecting the uneven subsidence degree of area 3, 4 are complicated. ②It is found that the variation and duration of groundwater level fluctuation are the main factors affecting the uneven degree of time series subsidence.

Keywords uneven subsidence      Moran’s I      shallow surface space utilization      groundwater      cross wavelet     
:  TP79  
Corresponding Authors: Huili GONG     E-mail: gonghl_1956@126.com
Issue Date: 18 June 2020
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Yike SUN
Huili GONG
Beibei CHEN
Chaofan ZHOU
Wenfeng CHEN
Xiaojing ZHANG
Cite this article:   
Yike SUN,Huili GONG,Beibei CHEN, et al. Quantitative analysis of uneven subsidence by Moran’s I and cross wavelet[J]. Remote Sensing for Land & Resources, 2020, 32(2): 186-195.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020.02.24     OR     https://www.gtzyyg.com/EN/Y2020/V32/I2/186
Fig.1  Overview of the Beijing Plain
Fig.2  Flow chart of PSI
Z得分 P 置信度/%
Z>1.65 P<0.10 90
Z>1.96 P<0.05 95
Z>2.58 P<0.01 99
Tab.1  Relationship between uncorrected P value, Z score and confidence
Fig.3  Annual settlement rate of the Beijing plain from 2011 to 2015
Fig.4  Spatial distribution of cumulative settlement by InSAR in the Beijing plain from 2011 to 2015
Fig.5  Verification diagram of Radar interferometry level
Fig.6  Location of five typical areas
Fig.7  Moran’s I based on cumulative settlement and annual time series subsidence in 5 regions from 2011 to 2015
Fig.8  Evolution of Moran’s I of land subsidence in 5 typical areas from 2011 to 2015
Fig.9  Temporal subsidence changes in 5 typical areas from 2011 to 2015
Fig.10  Space utilization situation of tyical areas
典型区 高铁数
量/条
地铁数
量/条
铁路数
量/条
高层建筑
1 2 1 2 较少
2 3 2 3 最多
3 3 3 3 较多,机场
4 3 1 0 最少
5 1 0 1
Tab.2  Specific information on shallow surface space utilization of typical areas
典型区 地质条件 可压缩层厚度 地下水位
1 多层结构土体 <50 13~20
2 多层结构土体 40~70 13~20
3 以多层结构土体为主 50~70 -11~17
4 以多层结构土体为主 50~80 -17~18
5 以单层结构粘性土为主 60~90 12~27
Tab.3  Geological background in typical area(m)
Fig.11  land subsidence variation and groundwater level variation by cross wavelet method in area 1
Fig.12  Land subsidence variation and groundwater level variation by cross wavelet method in area 2
Fig.13  Land subsidence variation and groundwater level variation by cross wavelet method in area 3
Fig.14  Land subsidence variation and groundwater level variation by cross wavelet method in area 4
Fig.15  Land subsidence variation and groundwater level variation by cross wavelet method in area 5
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