Quantification of resilience of water resources in carbonate aquifers to drought conditions
Figure 2: Illustration of the relevant components of the vadose zone which the transfer function determines (left) and of the transfer function and the various distribution functions in the frequency domain (right).
The transfer function describes the vadose zone as a "black box". The transfer function consists of information about the input (precipitation) and output (groundwater recharge), from whose Power Spectral Density (PSD) the transfer function is determined in the frequency domain. With the transfer function, precipitation signals can be converted into groundwater recharge. The mean flow velocities as well as the stored water volume can also be determined.
Since the transfer functions in the GRaCCE project are applied in carbonate aquifers, the different seepage velocities along the fractures and interaction with the matrix have to be considered. This is done by a tripartition of the frequency ranges with different distribution functions. The normal distribution, the "white noise signal", represents the fast groundwater recharge along fractures, whereas the gamma distribution represents the interaction of the fractures with the matrix and the exponential distribution represents the slow flow component in the matrix.
University of Göttingen
Lead: Prof. Dr. Irina Engelhardt
Other national partners
Helmholtz Centre for Environmental Research - UFZ
VisDat geodatentechnologie GmbH
Ben-Gurion University of the Negev, IL
Hydrological Service Israel, IL
MEKOROT Co Ltd., IL
Hydro-Engineering Consultancy, PS
Palestinian Water Authority, PS
Palestinian Hydrology Group for Water and Environmental Resources Development, PS
Al al-Bayt Universität, JO
The project is sponsored by the German Federal Ministry of Education and Research (BMBF) as part of the Middle East Regional Water Technology Cooperation Program (MOST).
Project duration: 2021-2024