University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Doctoral Thesis:
Rasha Mohamed Badr Eldin Mohamed
(2011):
Estimation of Groundwater Recharge Using Field Measurements and Numerical Models.
Doctoral Thesis - Institut für Hydraulik und landeskulturelle Wasserwirtschaft (IHLW),
BOKU-Universität für Bodenkultur,
pp 140.
UB BOKU
obvsg
- Abstract:
- Quantification of groundwater recharge is an important in regions with large demands for ground water supplies, where such resources are the key to economic development. Groundwater is an important resource for drinking water in Austria and therefore quantity and quality need to be protected. The main objective of this study was to assess groundwater recharge rates for a forested site located in the North Tyrolean limestone Alps in Achenkirch, Austria. In 1997 the Hydrographic Survey in Austria started a soil water monitoring station equipped with FDR-sensors to measure soil water content and with tensiometers for matric potential measurement in four depths (5 cm, 15 cm, 25 cm and 50 cm). The SWAP (Soil Water Atmosphere Plant) model was used to estimate groundwater recharge and others water balance components. The input parameters of the model were climatic data, crop parameters and soil data. The necessary soil hydraulic parameters were obtained from field monitoring data from 1997-2009 for water content and matric potential, field measurements and laboratory measurements. The comparisons of simulated and measured soil water contents was analysed using the Willmott index (EFIA) and the root mean square error (RMSE) in order to evaluate the quality of prediction of the model. Results show that the water contents simulated by SWAP model is in a good agreement with measured ones. The total groundwater recharge during the study period ranged from 571 mm in year 2003 to 987 mm in year 1999 with an annually average of 785 mm / year. The study revealed that there is a linear correlation between precipitation and ground water recharge. Under CNRM-ALADIN climatic change model for the period 1951-2100, SWAP model used to predict water balance components. The site and soil-specific parameters were set and kept constant during the climatic scenario studies. According to the future simulation scenarios results, in conjunction with decreasing in precipitation, groundwater recharge will be decreased which leads to take the necessary precautions to maintain the sustainable use of this groundwater resource.
- Betreuer: Klik Andreas
- 1. Berater: Loiskandl Willibald
- 2. Berater: Holzmann Hubert