南部非洲降雨引起的地面变形

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Terra Nova Pub Date : 2023-04-04 DOI:10.1111/ter.12650

O. Dauteuil, M. Jolivet, Louis Gaudaré, Anne-Morwenn Pastier

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引用次数: 1

摘要

我们基于GPS和GRACE时间序列以及对水文荷载弹性弯曲响应的模拟，对南部非洲大规模季节性降雨引起的地面变形进行了分析。这项包括赞比亚南部、安哥拉南部、纳米比亚北部和博茨瓦纳北部在内的大规模研究显示，热带到半干旱条件之间存在纬度降水梯度。GRACE数据显示，水量的年度变化向南急剧减少。位于赞比亚、纳米比亚和博茨瓦纳的三个永久站的GPS时间序列显示季节性同步垂直位移，振幅从4向南减小到2 cm，偏移2-3 距离主降雨季节还有几个月。结合降雨、蒸散、蓄水、洪水迁移和河流输出的弯曲模拟产生了高达6的地面弯曲 cm，时间与GPS时间序列一致。它突出了位于卡拉哈里沙漠的地表含水层的水文缓冲作用。

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Rainfall‐induced ground deformation in southern Africa

We present an analysis of ground deformation induced by large‐scale seasonal rainfall in Southern Africa, based on GPS and GRACE time series and on simulations of elastic flexural response to hydrological loading. This large‐scale study including South Zambia, South Angola, North Namibia and North Botswana displays a latitudinal precipitation gradient between tropical to semi‐arid conditions. GRACE data display annual variations in water mass decreasing drastically southwards. GPS time series of three permanent stations located in Zambia, Namibia and Botswana show seasonal synchronous vertical displacements with amplitude decreasing southwards from 4 to 2 cm, with a shift of 2–3 months from the main rainfall season. Flexure simulations integrating rainfall, evapotranspiration, water storage, flood migration and river output produce a ground flexure up to 6 cm with timing in agreement with the GPS time series. It highlights the hydrological buffering of surface aquifer located in the Kalahari sands.

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来源期刊

Terra Nova 地学-地球科学综合

CiteScore

4.80

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.