Modeling of the flood regimes in coupled stream-aquifer systems

Korkmaz, Serdar
In this study, hydrogeological modeling of the Somme river basin situated in the north of France was made with special emphasis on the stream-aquifer interaction. The coupled model developed at Ecole des Mines de Paris was used. Geographic Information Systems (GIS) tools were incorporated during all the stages of modeling process for both preparation of input data and visualization of the results of simulations. Initially, the process began with Digital Elevation Model (DEM) analysis. Afterwards, the surface and aquifer grids were generated by using nested grid generators and refinement was made on the stream network and subcatchment boundaries in order to increase the accuracy of numerical solution. In order to run the surface model, meteorological forcing, land use and soil type data were acquired. Surface model was used to partition the precipitation into evapotranspiration, infiltration and surface runoff components. A steady-state piezometric head distribution was computed by the groundwater model to serve as an initial condition to the coupled model. The flow in the unsaturated zone was simulated by using Nash cascade model. The unsteady groundwater and surface flow simulations were performed by taking into consideration the stream-aquifer interaction on a daily time step. The calibration and validation were realized by using the streamflow and piezometric head measurements distributed around the basin. The strong groundwater influence on the hydrology of the basin is well represented by the model. Comparisons of predicted flooded areas in year 2001 were made with other models and a satellite derived image. In the end, several sensitivity analyses were performed for several parameters concerning the groundwater flow.


Application of the coupled model to the Somme river basin
KORKMAZ, SERDAR; Ledoux, Emmanuel; Onder, Halil (2009-03-15)
Hydrological modeling of the Somme river basin situated in the north of France was made with special emphasis on the stream-aquifer interaction. Due to immense groundwater storage in the chalk aquifer, a damaging flood took place in the basin in spring 2001. To best represent the phenomena occurring in the basin, the coupled model also known as MODCOU was selected to be applied to this particular basin. The whole model structure consists of several components, namely, surface model, groundwater model, unsat...
Performance of a precast concrete beam-to-beam connection subject to reversed cyclic loading
Korkmaz, HH; Tankut, T (Elsevier BV, 2005-08-01)
This study was performed as one phase of an extensive research program focusing on the seismic behaviour of precast connections carried out in Middle East Technical University. The primary objective of the research program was to observe and investigate the seismic behaviour of the connection detail proposed by the collaborating company and the specimens with improved details, in order to develop a 11 moment resisting precast concrete beam-to-beam connection". In this study, six beam-beam connection subasse...
Investigation of relationship between aggregate shape parameters and concrete strength using imaging techniques
Özen, Murat; Güler, Murat; Department of Civil Engineering (2007)
In this study, relationships between aggregate shape parameters and compressive strength of concrete were investigated using digital image processing and analysis methods. The study was conducted based on three mix design parameters, gradation type, aggregate type and maximum aggregate size, at two levels. A total of 40 cubic concrete specimens were prepared at a constant water-cement ratio. After the compressive strength tests were performed, each specimen was cut into 4 equal pieces in order to obtain the...
Upgrading of slab-column connections using fiber reinforced polymers
Binici, Barış (Elsevier BV, 2005-01-01)
The results of an experimental program on upgrading of reinforced concrete slab-column connections subjected to monotonic shear and unbalanced moment transfer are presented in this study. Externally installed carbon fiber reinforced polymer (CFRP) stirrups acting as shear reinforcement around the slab-column connection area were used with two patterns of CFRP arrangements. It was found that the proposed method resulted in punching shear capacity increases up to 60% relative to the specimen without any stren...
Modelling the fresh properties of self compacting concrete utilizing statistical design of experiment techniques
Eroğlu, Levent; Yaman, İsmail Özgür; Department of Civil Engineering (2007)
Self compacting concrete (SCC) is first developed in Japan in the late 1980s in order to overcome the consolidation problems associated with the presence of congested reinforcement. It is also termed as a high performance concrete, as it can flow under its own weight and completely fill the formworks. As the fresh properties of SCC are quite important, mix design of a SCC is performed by considering various workability related fresh properties. Therefore, a well designed SCC should satisfy all requirements ...
Citation Formats
S. Korkmaz, “Modeling of the flood regimes in coupled stream-aquifer systems,” Ph.D. - Doctoral Program, Middle East Technical University, 2007.