Analysis of assimilation capacity for conservation of water quality: controllable discharges of pollutants

摘要: Protection of water quality from the hazards industrial, agricultural, urban, and other sources pollutants has been a big concern for resources managers in recent decades. Sources are often classified into different large categories, which can be predicted by modeling. In this investigation, river-reservoir system with controllable pollution source was chosen one-dimensional pollutant transport model considered to calculate assimilation capacity (AC) river. All modeling procedures were processed accomplished analytical solution also numerical methods, QUICK (quadratic upwind differencing) approach SEF (symmetric exponential function) method, simulating MATLAB. Results symmetrical entrance demonstrate that domain Cs (allowable concentration) 0.13 0.71 mg/l, amount $$ \overline{{\mathrm{c}}_{\mathrm{a}}} $$ (mean area unallowable is range 0.28–0.68, 0.3–0.63, 0.63–0.56 mg/l analytical, SEF, respectively. Therefore, amounts acquire more similarity method than QUICK. A novel general relationship determined AC river applying nonlinear regression obtained data then verified measured values nitrate concentration Karun River Iran. Statistical parameters, R2, RMSE, MAE, proposed equal 0.955, 0.186, 0.065 calibration 0.912, 0.251, 0.093 compared laboratory data,