干旱灌区地下水基本特征与水文地质问题——以甘肃景泰灌区为例

本文以甘肃景泰灌区为例,讨论了干旱灌区地下水所具有的基本特征。这些特征主要表现为灌溉入渗成为地下水的主要补给出源,强烈的蒸发作用又是地下水排泄的重要形式,因而导致了灌区土壤次生盐渍化和水质恶化两个水文地质问题。

THE BASIC FEATURES OF THE SUBTERRANEAN AND THE HYDROGEOLOGIC PROBLEMS IN THE ARID IRRIGATION AREAS

The paper uses Jingtai irrigation areas (Gan Su province) as an example discussing the basic features of subterranean in arid irrigation areas. These features indicate that the infiltration of irrigated water becomes a main rep- lenishment source for the subterranean; while the strong evaporation becomes one of the important forms for the subterranean to drain. These lead to two problems: a. the secondary salinization of the soil in irrigation area; b. the deterioration of the water quality.