Using Multi-year Hydrograph to Comparison the Hydrogeological Regimes of Karstic Springs in Kuhe-safid Anticline, Khuzestan, Iran

Monitoring and analysis of spring hydrograph is the best method to study of karstic reservoirs. The results can provide a significant insight to understand and management of these valuable resources. The main aim of this study is determine the characteristics of karstic aquifers from two spring, Barmejamal and Poto, located in south-east of Khuzestan province, using multi-year hydrograph analysis. The stage-discharge data from several consecutive years has been analyzed to determine the recession coefficients, the fraction of quick flow and base flow, and to identification the hydrogeological charactristics of the aquifers that feeding the springs. The results show that karst aquifers were formed in the Kuhe-safid anticline can exhibit different hydraulic behaviors. The analysis of recession coefficients reveals that the discharge of Barmejamal spring is controlling by two type of flow such as conduit flow and diffuse-matrix flow while the second is dominant. Whereas, for Poto spring the conduit flow with a threshold. In addition the hydrograph analysis show that the wet and droughts periods can considerably increase and decrease the Barmejamal spring aquifer storage, respectively. However, due to quick depletion, the wet periods will not increase the groundwater reserve of Poto spring aquifer. Consequently, in comparison to the Poto spring, the barmejamal spring is more reliable for water supply in dry and drought periods, because of highest amount and time of discharge. Furthermore, the results of this investigation reveal a scarce behavior for Poto spring discharge.