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Mechanisms responsible for streamflow generation on a small, salt‐affected and deeply weathered hillslope

Mechanisms responsible for streamflow generation on a small, salt‐affected and deeply weathered... This paper considers the contributions of overland flow, throughflow and deep seepage to the generation of streamflow in a salt‐affected, deeply weathered landscape. Runoff mechanisms on a small hillslope in south‐western Australia were dependent on the extent and development of variable source areas. In winter, streamflow generation was controlled by returnflow, saturation overland flow and throughflow. In summer, post‐ponding, infiltration‐excess and saturation overland flow dominated. The extent of the variable source area and the magnitude of streamflow were due to antecedent soil moisture, rainfall and slope morphology. Concave hillslope sections accumulated soil moisture due to both saturated and unsaturated lateral flow processes. Throughflow provided the mechanism and vehicle for solute movement from the groundwater discharge area to the stream. However, discharge from the deep aquifer was the primary mechanism responsible for soil salinity and maintaining the core of the variable source area. Estimates of throughflow which only take account of soil‐water movement and disregard returnflow, will underestimate the magnitude of throughflow. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Earth Surface Processes and Landforms Wiley

Mechanisms responsible for streamflow generation on a small, salt‐affected and deeply weathered hillslope

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References (29)

Publisher
Wiley
Copyright
Copyright © 1993 John Wiley & Sons, Ltd
ISSN
0197-9337
eISSN
1096-9837
DOI
10.1002/esp.3290180402
Publisher site
See Article on Publisher Site

Abstract

This paper considers the contributions of overland flow, throughflow and deep seepage to the generation of streamflow in a salt‐affected, deeply weathered landscape. Runoff mechanisms on a small hillslope in south‐western Australia were dependent on the extent and development of variable source areas. In winter, streamflow generation was controlled by returnflow, saturation overland flow and throughflow. In summer, post‐ponding, infiltration‐excess and saturation overland flow dominated. The extent of the variable source area and the magnitude of streamflow were due to antecedent soil moisture, rainfall and slope morphology. Concave hillslope sections accumulated soil moisture due to both saturated and unsaturated lateral flow processes. Throughflow provided the mechanism and vehicle for solute movement from the groundwater discharge area to the stream. However, discharge from the deep aquifer was the primary mechanism responsible for soil salinity and maintaining the core of the variable source area. Estimates of throughflow which only take account of soil‐water movement and disregard returnflow, will underestimate the magnitude of throughflow.

Journal

Earth Surface Processes and LandformsWiley

Published: Jun 1, 1993

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