vulnerability assessment of marab karstic aquifers pollution using riske model and analysis of time series

vulnerability and contamination risk assessment is of great importance in karst aquifer management. because of vastness of karst in zagros, natural conditions and human activity within the region of aquifer, pollution emission has become one of the most important challenges in front of zagros aquifers. the purpose of this study is to assess marab aquifer vulnerability, using riske model and, defining 5 parameters of rock (r), infiltration (i), soil (s), karst development (k), epikarst (e) to evaluate the vulnerability of karst surfaces. the internal network development of marab karst aquifer was evaluated using single-variable autocorrelation statistical methods. ultimately, analyzing the results of these two methods, we assessed the vulnerability of the aquifer. the results of risk model indicated three zones of vulnerability. the medium, small and large layers were 57.5, 37.7 and 4.8 percent of the region respectively. the vastness of vulnerability layers suggest average level of vulnerability of marab against pollution emission. the most vulnerable areas are located within sinkholes and poljes. the results of autocorrelation function suggested a multiple hydrodynamic behavior and two base and fast flow for marab aquifer. therefore, we concluded that due to the fast flow in the aquifer and geomorphological development of karst surface, it is possible that contamination spread through the aquifer.