Predicting the effects of clearing on groundwater discharge to the Daly River
Details:
Title
Predicting the effects of clearing on groundwater discharge to the Daly River,
Creator
Knapton, Anthony,
Northern Territory. Department of Natural Resources, Environment And The Arts,
CSIRO. Land and Water Division,
Charles Darwin University,
The Daly River is a perennial stream. Dry season base flows in the Daly River are sourced from spring inflows, largely from the Oolloo Dolostone aquifer. Springs are critical to the river health and changes in the volume of water entering the river will affect water quality and impact upon water dependent ecosystems. In this study the impacts of changes due to clearing and extraction for irrigation on sprign flows have been predicted using analytical and numerical models of groundwater flow. The emphasis of this work was to understand the processes occurring and hence guide the development of land and water practices that will prevent adverse impacts on the ecosystems sustained by springs flows into the Daly River.,
Made available via the Publications (Legal Deposit) Act 2004 (NT).,
Table of contents
Executive Summary -- 1. Introduction -- 1.1. Background -- 1.2. Objectives -- 1.3. Modelling Steps -- 1.4. Location -- 1.5. Climate -- 1.6. Geomorphology -- 1.6.1. Topography -- 1.7. Clearing history -- 2. Hydrogeological setting and conceptual model -- 2.1. Hydrogeology -- 2.1.1. Cretaceous Rocks -- 2.1.2. Oolloo Dolostone -- 2.1.3. Jinduckin Formation -- 2.2. Observation date -- 2.2.1. Rainfall and potential recharge -- 2.2.2. River gauging data -- 2.2.3. Terrain elevation -- 2.3. Conceptual model -- 3. Model design -- 3.1. Model specifications -- 3.1.1. Spatial discretisation -- 3.1.2. Temporal discretisation -- 3.1.3. Error and convergence criteria -- 3.2. Boundary conditions -- 3.3. Hydraulic parameters -- 3.3.1. Recharge distribution -- 4. Results -- 4.1. Groundwater level hydrographs -- 4.2. Comparing groundwater levels to surface elevations -- 4.3. Groundwater discharge hydrographs -- 5. Discussion -- 5.1. Chloride mass balance to estimate component due to diffuse and direct recharge mechanisms -- 5.2. Comparison of modelling results with recharge estimates based on choride mass balance -- 5.3. Assessment of water logging in the Douglas/Daly agricultural area -- 6. Conclusions -- 7. Recommendations -- 8. References -- Appendix A Chloride Histories at gauging stations along Daly river.,
Language
English,
Subject
Groundwater,
Clearing of land -- Australia,
Australia,
Groundwater -- Research,
Research,
Clearing of land,
Publisher name
Department of Natural Resources, Environment and the Arts,
Place of publication
Alice Springs (N.T.),
Series
16/2006,
Report WRD16/2006,
Format
viii, 43 leaves : colour illustrations and maps ; 30cm.,
File type
application/pdf.,
ISBN
0724548823,
Copyright owner
Check within Publication or with content Publisher.,