Response mechanism of terrestrial water storage to cumulative precipitation in Yunnan based on GPS vertical displacement

doi:10.13474/j.cnki.11-2246.2022.0011

Abstract

Abstract: Based on the global positioning system (GPS) vertical deformation data from CMONOC, the terrestrial water load deformation of six basins in Yunnan are calculated by principal component analysis, the correlation analysis and cross-wavelet analysis with precipitation show that the change of terrestrial water storage(TWS) has a lag of 1.5~2.25 months in the semi-annual cycle and 3~6 months in the annual cycle relative to rainfall in each basin. There is a significant negative correlation between TWS and cumulative precipitation due to the superposition of lags on different period. The days of cumulative precipitation in the six basins are different, ranging from 47 to 109 days. Based on the result, a response mechanism of terrestrial water storage to cumulative precipitation in Yunnan is proposed.

Key words: vertical deformation, terrestrial water load deformation, cumulative precipitation, principal component analysis, cross-wavelet analysis

CLC Number:

P228

XIAO Jiahao, ZHANG Shuangxi, WEI Yu, CAI Jianfeng, HONG Min. Response mechanism of terrestrial water storage to cumulative precipitation in Yunnan based on GPS vertical displacement[J]. Bulletin of Surveying and Mapping, 2022, 0(1): 61-65.

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