TRANSITION ZONE WIDTH IN GROUND-WATER ON OCEAN ATOLLS

被引:15
|
作者
VOLKER, RE
MARINO, MA
ROLSTON, DE
机构
[1] UNIV CALIF DAVIS,DEPT CIVIL ENGN,DAVIS,CA 95616
[2] UNIV CALIF DAVIS,DEPT LAND AIR & WATER RESOURCES,DAVIS,CA 95616
来源
JOURNAL OF HYDRAULIC ENGINEERING-ASCE | 1985年 / 111卷 / 04期
关键词
Aquifers - Hydrogeology - Laminar boundary layer - Oceanography;
D O I
10.1061/(ASCE)0733-9429(1985)111:4(659)
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
An analytical solution for the thickness of the transition zone between fresh and seawater in aquifers on ocean islands is presented. The interface is treated as a mixing layer similar to a laminar boundary layer between fluids moving at different velocities. The method requires assumptions of homogeneous isotropic dispersion, uniform hydraulic conductivity and steady flow; all water withdrawal is assumed to occur at the water table. The slope of the sharp interface is used in the solution for the mixing layer and the sharp interface is determined using Dupuit‐Forchheimer assumptions of horizontal flow. The method presented efficiently estimates the transition zone thickness, thus providing information not available from sharp interface models. The method is illustrated by application to the freshwater lens on an island of the Tarawa Atoll in the Pacific Ocean, and is used to show the effects of different pumping arrangements on the width of the mixing layer. Copyright © 1985 ASCE.
引用
收藏
页码:659 / 676
页数:18
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