Residence time of bedform-driven hyporheic exchange

被引：124

作者：

Cardenas, M. Bayani ^{[1
]}

Wilson, John L. ^{[2
]}

Haggerty, Roy ^{[3
]}

机构：

[1] Univ Texas Austin, Dept Geol Sci, Austin, TX 78712 USA

[2] New Mexico Inst Min & Technol, Socorro, NM 87801 USA

[3] Oregon State Univ, Dept Geosci, Corvallis, OR 97331 USA

来源：

ADVANCES IN WATER RESOURCES | 2008年 / 31卷 / 10期

基金：

美国国家科学基金会;

关键词：

Power-law residence time distribution; Hyporheic zone; Bedform; Sediment-water interface; Interfacial exchange zone;

D O I：

10.1016/j.advwatres.2008.07.006

中图分类号：

TV21 [水资源调查与水利规划];

学科分类号：

081501 ;

摘要：

Biogeochemical and ecological transformations in hyporheic zones are dependent on the timing of hyporheic exchange. We show through linked modeling of open channel turbulent flow, groundwater flow, and solute transport that the residence time distributions of solutes advected by hyporheic flow induced by current-bedform interaction follow power-laws. This tailing behavior of solutes exiting the sediments is explained by the presence of multiple path lengths coupled with very large variability in Darcy flow velocity, both occurring without heterogeneity in sediment permeability. Hyporheic exchange through bedforms will result in short-time fractal scaling of stream water chemistry. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1382 / 1386

页数：5

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