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Characteristics and trends of land subsidence in Tanggu, Tianjin, China

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Abstract.

Land subsidence in the Tanggu area is directly related to withdrawal of shallow groundwater within a depth of 300 m. The main strata responsible for the subsidence are at a depth of between 136 and 300 m. The contribution to subsidence made by the clayey soils is different from that of the sandy soils, as the former is related to the seasonal dropping of the water table while the latter is associated with annual changes. In addition, while there is a clear correlation between the accumulative groundwater extraction and the accumulative subsidence, this linear relationship is not obvious between annual extraction and annual subsidence. A case study in Tanggu, Tianjin, is presented in order to demonstrate a proposed computational model to predict land subsidence – the Optimization Model for Land Subsidence (OMLS).

Résumé.

La subsidence affectant la région de Tanggu résulte directement de l’exploitation d’eaux souterraines jusqu’à 300 m de profondeur. Les formations géologiques en cause se situent entre 136 et 300 m de profondeur. La contribution des formations argileuses au phénomène de subsidence est différente de celle des sols sableux, les premières répondant aux abaissements saisonniers de la surface piézométrique, les dernières jouant un rôle en rapport avec les fluctuations pluri-annuelles. De plus, alors qu’il y a une relation linéaire claire, sur une longue période, entre le volume total d’eau pompée et le tassement total mesuré, cette corrélation n’est pas évidente lorsque l’on compare le pompage annuel et le tassement annuel. Une étude de cas à Tanggu, Tianjin est présentée, utilisant le modèle de prévision de subsidence OMLS (Optimization Model for Land Subsidence).

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Hu, .R., Wang, .S., Lee, .C. et al. Characteristics and trends of land subsidence in Tanggu, Tianjin, China. Bull Eng Geol Environ 61, 213–225 (2002). https://doi.org/10.1007/s100640100132

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  • DOI: https://doi.org/10.1007/s100640100132

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