كاربرد مدل WASP در شبيه سازي غلظت سرب و كادميم در رودخانه ي زاينده رود

چكيده انگليسي :

Application of WASP to Simulate Lead and Cadmium Concentration in Zayandehrud River Rohollah Mohabbati Email address Mohebbaty@gmail com March 13 2011 Department of Natural Resources Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Persian Dr N Mirghafari and Dr S F MousaviAbstractNowadays routine water quality assessment approaches are replaced by integrated monitoring andmanagement of water resources In this content models are one of the management tools that areavailable and can be useful for managers and decision makers Regarding this fact that models canbe run for different scenarios after their setup they can used to decrease economic costs of largeprojects Zayandehrud River is the lifeline of Isfahan province at the central part of Iran and is animportant water source for drinking industries and in particular irrigation of agricultural fields Therefore water quality assessment of this river is one of the most important issues to watermanagement of Zayandehrud River This study used WASP model to simulate concentration ofcadmium Cd and lead Pb heavy metals in the water and sediments of Zayandehrud River So 12water and sediment samples were collected from Zayandehrud River at 3 temporal periods from 10stations along the river and 2 samples were collected from 2 important drains that bring in pollutionto the river All samples were analyzed using flame and graphite furnace atomic absorptionspectrometry immediately after taking to laboratory The results showed that average concentrationof Pb and Cd in water samples was 0 015 and 0 083 mg L respectively With regard to the nationalstandards of Iran limits are 0 05 mg L Pb in potable water and 0 05 mg L Cd in irrigation water Pb concentration of water is in the range of standards and there isn t any concern about it but Cdconcentration is higher than irrigation water standard that is hazardous Average concentration ofPb and Cd in sediment samples was 39 5 and 9 16 mg kg respectively Both Pb and Cdconcentration in the sediments is higher than average earth s crust concentration which shows thepresence of anthropogenic pollution resources in the study area Results also revealed thatanthropogenic pollution sources introduce Cd to the river besides geological effect of thewatershed Muller index showed that river sediments are polluted by Cd and Pb and managementoptions should take place to decrease heavy metals concentration in the water and sediments ofZayandehrud River Model precision and sensitivity was assessed using RMS error Dischargesimulation precision was 9 that is acceptable and shows good precision Cadmium concentrationsimulation error was 0 02 that is very good precision of the simulation Lead concentrationsimulation precision was 9 but the model can t simulate Pb concentration and trend in the riverwater Probably this is due to behavior and low concentration of Pb in the aqueous environments Thus WASP model needs more data for simulation of behavior and concentration of Pb in the river Results showed that despite the data deficiency the model has good precision to simulateZayandehrud River system Thus WASP can be recommended as a good model to simulate theconcentration of heavy metals in rivers Results of sensitivity assessment and running of differentscenarios showed that drainage control can be the best way to decrease heavy metals concentrationin the Zayandehrud River Key Words Zayandehrud Heavy metals WASP model Water quality Lead Cadmium

مجتبي، روح الله

كاربرد مدل WASP در شبيه سازي غلظت سرب و كادميم در رودخانه ي زاينده رود

كيفيت آب , فلزات سنگين