Analytical solutions with different boundary conditions for assessment of drawdown curve and pumping rate in a fluvial island
Abstract
For understanding a hydrogeological properties of fluvial island aquifer, there are two analytical methods using one straight recharge boundary and two straight parallel recharge boundary for understanding boundary condition of fluvial island aquifer and estimating pumping rate for water curtain cultivation which was seldom to be measured and so was difficult to estimate. The former condition, which considered finite imaginary well, had been applied to pumping test near riverside aquifer. One the other hand, the latter condition, which considered infinite imaginary wells, was rarely applied, even though methods were theoretically suggested. Study area was located at fluvial island in Yangpyeong, Korea. Groundwater level of the study area was usually influenced by water-level of river. In addition, groundwater use to prevent crops in greenhouse from cold-weather damage in nighttime, so called water curtain cultivation, has created daily fluctuation in groundwater level in winter. Decrease in groundwater level was observed from 4-5 p.m. to next morning 8-9 a.m. and average drawdown was about 0.2 m.In two straight parallel recharge boundaries, the number of imaginary wells were important in drawdown parameter estimation and a shape of fitting drawdown curve. The imaginary wells made by parallel recharge boundary, which was far from the observation wells, couldn't affect groundwater level of observation well. Also, one recharge boundary condition had lower RMSE values compared with RMSE of two parallel recharge boundaries. The established analytical model was used to estimate the amount of pumping rate.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFMNG41A1722P
- Keywords:
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- 9820 Techniques applicable in three or more fields;
- GENERAL OR MISCELLANEOUSDE: 3238 Prediction;
- MATHEMATICAL GEOPHYSICSDE: 4410 Bifurcations and attractors;
- NONLINEAR GEOPHYSICSDE: 4430 Complex systems;
- NONLINEAR GEOPHYSICS