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Journal of Materials Science: Materials in Electronics
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Iranian Water Researches Journal
Quantitative-qualitative hydrodynamic simulation and routing of transmission of pollution in domestic rivers using a combination of WASP and HEC-RAS models


 submission: 27/02/2019 | acception: 26/01/2020 | publication: 14/09/2020

DOI 

Authors
amirali abdollahi1, hossein babazadeh2*, bahman yargholi3, lobat taghavi4

1-Science and Research Branch,Tehran،abdollahi_67@yahoo.com

2-Science and Research Branch,Tehran،h_babazadeh@srbiau.ac.ir

3-Research Organization, Training and promoting agriculture, Karaj, Iran،yar_bahman@yahoo.com

4-Science and Research Branch,Tehran،taghavi_lobat@yahoo.com



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Abstract

Abstract Hydrodynamic prediction and simulation of rivers’ qualitative parameters is very important for determining the rate of loading of pollutants and the manner of transmission of pollution in aquatic ecosystems in relation to rivers’ Self-purification capacity. From the beginning of human life, because of the need for water for purposes of living, rivers and surface waters have always been considered essential. Cities and industrial and agricultural centers in fact, entire civilizations arose near the rivers in order to use sources of water. However, by developing industry and technology, human beings started destroying nature. Knowledge of the quality of water resources is one of the most important requirements in the planning and development of water resources and their conservation and control. Hence, in order to ensure the monitoring and management of the quality of this natural resource, some methods must be used that entail the least cost and time to attain these objectives. To develop these studies, sampling and environmental tests for water qualitative parameters were initially conducted. For performing this step, six stations were determined for monitoring in the Basin of the Balikhlouchai. The parameters considered were then measured and the results were compared with existing standards. The purpose of conducting this study is routing the pollution of Balikhlochai River, establishing a relationship between the results of two quantitative and qualitative simulated hydrodynamic models (HEC-RAS and WASP) and comparing the results with statistical indices: mean absolute error, root mean square error, Relative volume error, and Nash–Sutcliffe model efficiency coefficient. Given their self-purification and self-regulation capabilities, rivers in normal situations could undertake the natural load of pollution imposed by the environment and solve them. In situations in which such load and pollution have human origins and the pollution load is more than the river’s carrying capacity, they will be associated with destruction, pollution, and the death of river ecosystems. The reason for the increase in pollution load is the entry of surface runoff from the rainfall into the river and the washing of various pesticides and organic fertilizers, phosphate and nitrate due to drainage of agricultural land and the organic load entering the urban and rural Wastewater into the river along the route that the source of food It is important for these algae and, as a result, increases the pollution burden and reduces the health of the river. Calibration and validation of the model were performed based on samples taken from six monitoring stations during 2015-2016. According to the validation results, MAE, RMSE, RE and NSE statistical indices for DO were 0.04, 7.2, 4.7 and 0.84, respectively, and 0.07, 8.2, 5.2 and 0.81 for the river flow rate, respectively, representing the optimal and reliable results of the output of simulation models. The results obtained from statistical indices showed that the simulation of the research variables is well performed and the simulation results are reliable and both models have good performance in predicting water quality. Owing to the increasing population and growth of various kinds of pollution, the qualitative conditions of the rivers and aquifers become worse in the field of surface water. According to the results of the models’ output, the river discharge along the route ranged from 1.2 to 0.3 m³/s and DO ranged from 7.5 to 3.5 mg/l, indicating a severe reduction in the river flow rate and DO. Comparing these results gives a more accurate analysis of the pollution process in the Balkhlohai River; as the river's downstream is lowered, the loading rate of the pollutants is increased and the river is naturally unable to reduce pollutants and return the river to its normal state, because both the velocity of the water The river and the depth of the river are reduced, and the amount of river water mixing decreases, as well as the amount of dissolved oxygen dissolved in the river due to reduced mixing and increased pollution load, and pollution of the river increases; With studying the pollution process in Balikhlochai River, there is evidence of river pollution caused by urban wastewater and the entry of runoff from agricultural drainage water into the basin and the severe reduction in river self-purification capacity and Eutrophication phenomenon. The decade's prediction shows that if the measures needed to manage the current status of river water quality are not met, the river's health is compromised and should be stepped up to restore the river. The results indicate that the river downstream from the point of view of quality management should be prioritized and the study results can be used in determining the strategies for coping with pollution and promoting management in the Basin of Balikhlochai River.




Keywords

hydrodynamic simulation  prediction  routing of pollution  domestic rivers 



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