黄河三角洲深层地下水漏斗引发的地面沉降特征

Characteristics of Land Subsidence Induced by Deep Groundwater Funnel in the Yellow River Delta

利用GIS集成分析深层地下水、钻孔和水准观测等资料,揭示了黄河三角洲地区尤其南部广饶井灌区形成的大面积深层地下水水位降落漏斗时空演化规律及抽水引发的地面沉降特征.东营和广饶地面沉降漏斗与深层地下水降落漏斗分布相一致,中心沉降量和速率分别为155.1mm、28.2mm/a和356.0mm、64.7mm/a.在深层地下水下降速率为2m/a的情况下,运用土力学模型分层计算黄河三角洲沉降量,第二、三压缩层年最终压缩量分别为36—63mm和98—138mm,已成为黄河三角洲地面沉降主要贡献层.

Deep groundwater, boreholes and leveling observation data were integrated and analysed by GIS, the spatial-temporal evolution of a large area of deep water depression funnels in the Yellow River Delta region （ especially the well irrigation area in the south of Guangrao） and the characterization of land subsidence induced by groundwater pumping were revealed. The cumulative amount and rate of land subsidence funnel center in Dongying District and Guangrao Country corresponding to deep groundwater funnels is 155. lmm,28.2mm/a and 356.0ram, 64. 7mm/a,respectively. At the deep groundwater level drawdown rate of 2m/a, subsidence of different stratified stratums was calculated by soil mechanics model. The compression amount of the second and third compressed layer is about 36--63mm and 98--138mm in one year, respectively. The second and the third compressed layer have bebome the main contribution layers of land subsidence in the Yellow River Delta.