Geo-structural study, Iraq

Name of project:
Geostructural study from SPOT imagery on Sulaymaniyah-Sharazur basin
Country: Area of study:
Iraq Sulaymaniyah Governatorate, Iraqi Kurdistan
Customer:
SGI Studio Galli Ingegneria SpA (Padova, Italy)
Project objectives:
The study concerned the introductory phase of a complex hydrogeological investigation aimed at water supply. During this preliminary step the identification of structural features, affecting groundwater circulation in fractured bedrock was carried out, in order to map the areas characterized by the higher fracture density and other favourable aspects related to groundwater presence and to address subsequent in-depth analyses carried out with different methodologies
Composition of the working group:
GEOMAP
Personnel involved:
1 geologist photointerpreter, 1 GIS expert
Number man/months:
4
Project steps:
The adopted method is the one known as Fracture Analysis, based on the interpretation of remotely sensed images for the extraction of information on geo-structural features.
The imagery used for the interpretation was SPOT panchromatic with a ground resolution of 5 metres, pre-processed in order to obtain a geometrically correct document to be used for the production of maps both at the 1:100,000 scale for the whole study area and at 1:50,000 scale for a smaller area for which a greater detail was needed.
The interpretation was carried out by capturing (digitizing) the geo-structural features directly on the images in a GIS environment and classifying them on the base of a specific legend. The product of this first phase, represented by the entirety of the structural elements, is the Total Field of Linears, where the features are classified according to their importance and type, mainly determined by their relative length (Short linears, Linears, Long linears e Regional lineaments), ranging from a few hundreds of metres to several kilometers.
A subsequent processing consisted in the creation of Azimuth Distribution Diagrams, where the trends of orientation of structural features are aggregated according to azimuth sectors. These diagrams were realized using the Total Field of Linears or subsetting data on the basis of specific areas or stratigraphic/structural units.
A final elaboration was the Density of Linears, aimed at the identification of the most suitable areas for groundwater search, that is the nodes where structural elements cross. For this purpose, these points were classified (and represented) according to the number of crossing elements and their importance. This led to the production of a Map of Nodal Points, where the most interesting areas are those highlighted by the maximum concentration of nodes
Start (year/month): End (year/month): Value of the project:
09/2009 12/2009