Groundwater recharge in tropical wet regions via GIS based methods and cosmic ray neutron sensing Studies on the unsustainable use of groundwater resources are still considered incipient since it is frequently a poorly understood and managed devalued and inadequately protected natural resource. Groundwater Recharge (GWR) is one of the most challenging elements to estimate since it can rarely be measured directly and cannot easily be derived from existing data. To overcome these limitations many hydro(geo)logists have combined different approaches to estimate large scale GWR namely: remote sensing products such as IMERG product; Water Budget Equation also in combination with hydrological models and; Geographic Information System (GIS) using estimation formulas. For intermediary scale GWR estimation there exist: Non invasive Cosmic Ray Neutron Sensing (CRNS); wireless networks from local soil probes; and soil hydrological models such as HYDRUS. Accordingly this PhD thesis aims on the one hand to demonstrate a GIS based model coupling for estimating the GWR distribution on a large scale in tropical wet basins. On the ...