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Using Geochemical Tracers to Distinguish Groundwater and Parafluvial Inflows in Rivers (the Avon Catchment, SE Australia) : Volume 12, Issue 9 (10/09/2015)

By Cartwright, I.

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Book Id: WPLBN0004023560
Format Type: PDF Article :
File Size: Pages 42
Reproduction Date: 2015

Title: Using Geochemical Tracers to Distinguish Groundwater and Parafluvial Inflows in Rivers (the Avon Catchment, SE Australia) : Volume 12, Issue 9 (10/09/2015)  
Author: Cartwright, I.
Volume: Vol. 12, Issue 9
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: copernicus

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Hofmann, H., & Cartwright, I. (2015). Using Geochemical Tracers to Distinguish Groundwater and Parafluvial Inflows in Rivers (the Avon Catchment, SE Australia) : Volume 12, Issue 9 (10/09/2015). Retrieved from http://hawaiilibrary.net/


Description
Description: School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC 3800, Australia. Understanding the location and magnitude of groundwater inflows to rivers is important for the protection of riverine ecosystems and the management of connected groundwater and surface water systems. Downstream trends in 222Rn activities and Cl concentrations in the Avon River, southeast Australia, implies that it contains alternating gaining and losing reaches. 222Rn activities of up to 3690 Bq m−3 imply that inflows are locally substantial (up to 3.1 m3 m−1 day−1). However, if it assumed that these inflows are solely from groundwater, the net groundwater inflows during low-flow periods exceed the measured increase in streamflow along the Avon River by up to 490 %. Uncertainties in the 222Rn activities of groundwater, the gas transfer coefficient, and the degree of hyporheic exchange cannot explain this discrepancy. It is proposed that a significant volume of the total calculated inflows into the Avon River represents water that exfiltrates from the river, flows through parafluvial sediments, and subsequently re-enters the river in the gaining reaches. This returning parafluvial flow has high 222Rn activities due to 222Rn emanations from the alluvial sediments. The riffle sections of the Avon River commonly have steep longitudinal gradients and may transition from losing at their upstream end to gaining at the downstream end and parafluvial flow through the sediment banks on meanders and point bars may also occur. Parafluvial flow is likely to be important in rivers with coarse-grained alluvial sediments on their floodplains and failure to quantify the input of 222Rn from parafluvial flow will result in overestimating groundwater inflows to rivers.

Summary
Using geochemical tracers to distinguish groundwater and parafluvial inflows in rivers (the Avon Catchment, SE Australia)

Excerpt
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