摘要
过度抽汲地下水引发的地面沉降是全球广泛关注的地质环境问题。对其进行数值模拟是实现地面沉降灾害科学管理的最有效手段。水流模型是地面沉降模型的必要组成部分,对其刻画得准确与否将影响沉降模拟的准确度。本文首先综述了低渗透性粘性土体中的低速非线性Darcy渗流规律,而后从地面沉降发生的地质背景分析出发,论证了低速非线性Darcy渗流对地面沉降模拟的作用,并讨论了当前地面沉降模拟中水流模型刻画的不足之处。最后提出了如何在地面沉降模拟中考虑低速非Darcy渗流的4个关键性科学问题,对该问题的探讨有助于提高地面沉降模拟的准确性。
Land subsidence due to excessive groundwater exploitation is an attention-getting environmental hazard all over the world. Establishing a numerical model is a most effective approach to the reasonable management of geohazard. Groundwater flow model, an essential part of land subsidence model, has a very important impact on the accuracy of subsidence simulation result. This paper firstly reviewed the existence of low-velocity non-Darcy flow in the clayish aquitards or interbeds. Subsequently on the basis of the analyst of geo-environmental background to subsidence, the necessity of non-Darcy flow to subsidence simulation was elucidated. Meantime, a concernful defect of groundwater flow simulation in related current literatures was emphasized. Finally, 4 key scientific questions were advanced for how to take low-velocity non-Darcy flow in the land subsidence numerical simulation.
出处
《水文》
CSCD
北大核心
2012年第4期8-12,96,共6页
Journal of China Hydrology
基金
中国地质调查局项目"华北平原地面沉降调查与监测综合研究"(1212010540906)
关键词
地面沉降
水流模型
低速非Darcy流
land subsidence
groundwater flow model
low-velocity non-Darcy flow
