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Dynamic Analysis of Groundwater Discharge and Partial-area Contribution to Pukemanga Stream, New Zealand : Volume 4, Issue 4 (30/07/2007)

By Bidwell, V. J.

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Book Id: WPLBN0003980297
Format Type: PDF Article :
File Size: Pages 36
Reproduction Date: 2015

Title: Dynamic Analysis of Groundwater Discharge and Partial-area Contribution to Pukemanga Stream, New Zealand : Volume 4, Issue 4 (30/07/2007)  
Author: Bidwell, V. J.
Volume: Vol. 4, Issue 4
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2007
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Bidwell, V. J., Barkle, G. F., & Stenger, R. (2007). Dynamic Analysis of Groundwater Discharge and Partial-area Contribution to Pukemanga Stream, New Zealand : Volume 4, Issue 4 (30/07/2007). Retrieved from http://www.ebooklibrary.org/


Description
Description: Lincoln Environmental Research, Lincoln Ventures Ltd, Christchurch, New Zealand. The proportion and origin of groundwater contribution to streamflow from agricultural catchments is relevant to estimation of the effects of nitrate leached from the soil on the quality of surface waters. This study addresses the partitioning of streamflow contributions from near-surface runoff and from groundwater, each with different contributing land area, on a steep pastoral hillslope in a humid climate. The 3 ha headwater catchment of the perennial Pukemanga Stream, in the North Island of New Zealand, was instrumented for continuous observation of climatic data, streamflow and groundwater level. The dynamics of groundwater levels and groundwater contribution to streamflow were analysed by means of a one-parameter, eigenvalue-eigenfunction description of a 1-D aquifer model. Model results for seven years of daily data predict that 36–44% of the topographical catchment contributes groundwater to the stream. The remaining groundwater generated within the catchment contributes to streamflow outside the catchment. After correction for contributing areas, groundwater was calculated to be 58–83% of observed annual catchment streamflow or 78–93% of flow generation on a unit area basis. Concurrent hourly data for streamflow and groundwater levels at two sites indicate the dynamic behaviour of a local groundwater system. Groundwater flow dynamics that support the perennial nature of this headwater stream are consistent with the size of the groundwater body, porosity of the subsurface material, and hydraulic conductivity derived from partitioning of streamflow contributions.

Summary
Dynamic analysis of groundwater discharge and partial-area contribution to Pukemanga Stream, New Zealand

Excerpt
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