期刊
JOURNAL OF ARID ENVIRONMENTS
卷 57, 期 2, 页码 211-223出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/S0140-1963(03)00095-8
关键词
Namibia; arid regions; ephemeral floodplain; hydrochemistry; salinization
Ground-water quality in drinking water sources within ephemeral flood plains in the Namib Desert and north central Namibia displays seasonal and spatial variations. The monthly variation in total dissolved solids (TDS) in individual sources ranges between 5% and 65% in north central Namibia and between 0.5% and 85% in the Namib Desert. A higher monthly TDS variation, close to 500%, is recorded in slightly deeper as well as over-pumped freshwater sources in both study sites. The lowest TDS values are recorded after the rains for north central Namibia sources and only after flood events for sources in the lower rainfall Namib Desert. Ground-water salinization in both sites is generally characterized by a shift from 'fresh' to 'very saline' ground-water, and a chemical evolution from Na and Ca-HCO3 waters towards Na-Cl ones. The dominant processes that determine these hydrochemical shifts are refreshing by recharge waters, concentration by evaporation, dissolution of saline sediments (mainly evaporites), and mixing with older and more saline ground-water. (C) 2003 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据