Generation of cross-sections

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As Part of Work Package 2, the eE+E are involved in Surface Water modelling as well as a Geographic Information System- (GIS) based analysis of the entire Olifants River Basin. We took the opportunity, while in South Africa to present our findings at the annual Status Workshop, to do some fieldwork on the way to Phalaborwa as well as on the way back to Johannesburg after the workshop. We packed our days full with activities and this proved to be very useful and insightful to us in the long-run.

For the 1D Hydrodynamic Modelling that we involved in, cross-section generation is very important for the hydrological aspects of the model itself. The eE+E team designed a simplistic, cross-section generation technique, involving a measuring tape and an excel template and, using our practical GIS2go fieldwork tablet, designed and compiled by ‚Disy Informationssysteme‘, we designed a fieldwork itinerary for three days, generating cross-sections on important rivers every time road bridges crossed the river. This made access to important rivers easy as well as giving us the opportunities to do fieldwork without having to acquire permits or permissions from local authorities.

These useful point sources, as well as the cross-sections that we will be able to derive through GIS tools from the Digital Surface Models (DSM) ‚Die Gewässerexperten‘ are creating for us, we are getting closer and closer to creating a more precise conceptual model of the hydrodynamic properties of the Lower Olifants river basin. This work will all be integrated into the 1D Hydrodynamic Model and used for calibration throughout next year.

The team also used the opportunity to see as much of the basin and its attributes as possible. Since we work in a ‚remote‘ sense (at our desks in Bochum, Germany over 10 000km away from the basin), we drove through areas of interest for our research and were able to do a lot of ‚ground-truthing‘ – relevant to the creation and perpetuation of our hydrological and analytical map generation.

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