Basin Simulation Modelling Package for MRC decision support frameworks using for prediction of impacts of changes in conditions within the basin on the river system compose of SWAT, IQQM and iSIS model.More Information on MRC Model
SWAT is a simulation catchment runoff based on estimates of daily rainfall and the topography, soils and land cover of each sub-basin.
The SWAT software has the capability to investigate nutrient and sediment flows also, but there are insufficient data to establish calibrated models for these at present. Within the Lower Mekong Basin (LMB), the catchment is divided into different sub-basins to simulate this runoff according to hydrological condition and its reference station.
The Integrated Quantity and Quality Model used output from SWAT sub-basins to route through the river system, making allowance for control structures such as dams and irrigation abstractions.
Information on daily discharges are generated throughout the system and particularly at the primary outfalls of Kratie on the mainstream and the Great Lake in the Tonle Sap basin including Mekong Delta near river mouth.
A hydrodynamic model, based on ISIS software, is used to simulate the river system downstream of Kratie, including the Tonle Sap and the East Vaico in Viet Nam where wet season flooding extends beyond the LMB boundary.
The hydrodynamic model represents the complex interactions caused by tidal influences, flow reversal in the Tonle Sap River and over-bank flow in the flood season with the varying inflows from upstream. Such complexity cannot be modelled by simple routing models.
The hydrodynamic model thus uses outputs from the IQQM model for upstream flows under different scenarios, direct runoff from local catchments modelled using SWAT and irrigation water use modelled using IQQM. Salinity is also modelled using the hydrodynamic model.
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