The impact of urban groundwater upon surface water - eTheses ...

5.5.2 Riverbed Sediment Core Data and Sieve Analyses........................................................................... 129
5.6 Estimates of groundwater flow through the riverbed................................................................................ 134
5.6.1 Darcy Flow Estimates ....................................................................................................................... 134
5.6.2 Radial Flow Estimates ...................................................................................................................... 136
5.6.3 Estimates of Flow from Measurements of Temperature Gradient .................................................... 137
5.7 Groundwater and Surface Water Interactions........................................................................................... 140
5.8 The Hydrogeological Setting of Profile 8................................................................................................. 143
5.9 Concluding Discussion ............................................................................................................................. 147
CHAPTER 6. THE MODELLING OF GROUNDWATER FLOW TO THE TAME ....................... 151
6.1 General Modelling Objectives .................................................................................................................. 151
6.2 Modelling Tools........................................................................................................................................ 152
6.2.1 Analytical Model, Steady State Solution .......................................................................................... 153
6.2.2 Analytical Model, Transient Solution ............................................................................................... 154
6.2.3 MODFLOW...................................................................................................................................... 155
6.2.4 FAT3D.............................................................................................................................................. 155
6.2.5 UNSAT ............................................................................................................................................. 156
6.3 Investigation of groundwater flow paths across the river flood plain....................................................... 156
6.3.1 Regional conceptual model of groundwater flow through the flood plain........................................ 157
6.3.2 Groundwater flow to a river meander - MODFLOW model ............................................................ 158
6.3.2.1 Boundaries and grid layout ............................................................................................................ 160
6.3.2.2 Model Parameters .......................................................................................................................... 160
6.3.2.3 Model Calibration. ......................................................................................................................... 162
6.3.2.4 Sensitivity of parameters................................................................................................................ 163
6.3.3 Results and discussion ...................................................................................................................... 164
6.4 Investigation of groundwater flow paths at the near channel scale in the vertical plane. ......................... 166
6.4.1 Conceptual model of groundwater flow to the river channel............................................................ 166
6.4.2 Application of the MODFLOW flood plain model to assess underflow........................................... 166
6.4.3 Groundwater flow to the river channel - FAT3D cross sectional model........................................... 167
6.4.3.1 Boundaries and grid layout ............................................................................................................ 167