TITLE:
DEM-Based GIS Algorithms and 3D Geospatial Mapping for Creation of Hydrogeological Models Data in Foussana Basin (Central Tunisia)
AUTHORS:
Sami Khemiri, Ismail Chenini, Salwa Saidi, Brahim Baamar, Abdallah Ben Mammou, Fouad Zargouni
KEYWORDS:
DEM; GIS; Surface Water; Groundwater; Modeling
JOURNAL NAME:
Journal of Water Resource and Protection,
Vol.5 No.8,
August
14,
2013
ABSTRACT:
There are many factors which affect the hydrological, geomorphologic
and hydrogeological condition of the area. In order to better comprehend all
processes, a Digital Elevation Model (DEM) was developed based on Geographical Information
System. This latter appears as an essential tool to facilitate the decision
support and can provide very important geological information. In fact, the use
of the DEM is growing dramatically with the use of the GIS and the improvement
of information extracted from elevation data such as mapping of floods, forest
areas, erosion, and lineaments. The spatial distribution of topographic
attributes can often be used as an indirect measure of the spatial variability
of these processes and allows them to be mapped using relatively simple
techniques. The main purpose of this study is to model the natural surface of
the earth as the most accurate and the most precise. For this end we have tried
in this work to develop various types of Digital Elevation Models DEM of the
Foussana rift in Central Tunisia and to demonstrate the role of these models in
geological, hydrogeological and hydrological study. The 3D model is also
coupled in this study with piezometric and hydrochemistry study, so a new
information’s plan was mapped by multiple GIS techniques like Spatial analysis and interpolation; in order 1) to comprehend the hydrodynamic of the
aquifer, 2) to quantify surface and subsurface water resources and 3) to generate water
management scenarios in the study area. To this end, several groundwater
samples were collected and analyzed from wells and piezometers. Examining the
corresponding physical and chemical parameters showed an increase in the
concentrations of hydraulic conductivity in the center of the study area and it
coincided with zones with high nutrient concentration. Recommendations are
proposed in this zone.