Poster Number 234
See more from this Division: Topical Sessions
See more from this Session: Innovative Methods for Investigating Flow and Transport in Karst Systems (Posters)
Abstract:
When a discharge event was recorded at a gage, radar-rainfall (RR) of the preceding 24 hours was integrated with previous RR amounts associated with other discharge events- using GIS software- to produce an evolving hyetograph image of the local region (about 450 km2). The hypothesis was that a summed sequence of causal precipitation events would highlight and identify those areas contributing to discharge at a gage point.
This procedure was used to establish boundaries between the Tanamá karst catchment and the neighboring karst of the Río Camuy to the west, recorded at gage #50014800 (mean 3.1 cms). RR hyetographs were produced from 11 discharge events that occurred on the Tanamá, but which were absent or minimal on the Camuy, and for 7 discharge events that occurred on the Camuy but not on the Tanamá. The resulting hyetographs corresponded with several known limits of the catchment boundaries, showed a clear separation between the two groundwater catchments (core areas of about 30 and 50 km2 respectively), and provided hydrogeological detail about the local influence of non-permeable layers, evapotranspiration, and rain-runoff lag times.
See more from this Division: Topical Sessions
See more from this Session: Innovative Methods for Investigating Flow and Transport in Karst Systems (Posters)