Author(s): Farhad Yazdandoost; Mohammad Zounemat Kermani
Linked Author(s): Farhad Yazdandoost
Keywords: Rtificial wetlands; Urban storm water; Two dimensional modeling; Hydraulic efficiency; Hydraulic retention time
Abstract: system. One of the most important factors that has a significant effect on the design of artificial wetlands is the hydraulic efficiency. In simple terms, the hydraulic efficiency of a wetland can be regarded as its capability to treat the water flow through it. The common method for calculating the amount of hydraulic efficiency introduces the utilization of a tracer to denote the quantity of the outlet concentration against the time. However, this is only possible in some natural wetlands. It is therefore necessary to use numerical methods for simulation and evaluation of various potential physical scenarios. In the present study, the relationship between the hydraulic efficiency and the wetland shape was initially investigated for simple conditions. A new technique has been suggested for estimation of hydraulic efficiency and comparisons are made and presented for the results obtained by this technique and those obtained by conventional techniques. A two dimensional model for solution of the general shallow water equations has been developed. Finite differences method has been used in the computational procedures of the model to descretise the main equations alongside utilizing the ADI solution technique. The prevailing computational model is capable of simulating the treatment process and predicting the tracer transition. Notable advantage of this method is that the tracer measurement procedures are no longer required.