An Analysis on Discharge Carrying Capacity of Lam Pachi River by MIKE11 Model

Abstract

The study was carried out by an application of MIKE11 hydrodynamic model in order to simulate one dimensional flow in Lam Pachi river and analyze flooding in this river basin. First, the observed data of water level, discharge, and rating curves were collected in the period of 2006 – 2015. The river cross sections of Lam Pachi river and flood plain were surveyed in the year of 2016. The model calibration and verification were later carried out at the runoff station K.61 and K.62. The result found that R² and RMSE were accepted. Furthermore, calibrated hydrodynamic model was applied to analyze the discharge carrying capacity and river depth for each cross section in Lam Pachi river. It found that the downstream portion of Lam Pachi river between KM. 60+001 to KM. 71+759 has a maximum of average discharge carrying capacity around 669 cms. In addition, the average discharge carrying capacity of all portions of Lam Pachi river was around 364 cms. The river portion between KM. 40+001 to KM. 50+000 at amphoe Dan MaKhamTia, Kanchanaburi Province has a minimum of average discharge carrying capacity around 170 cms and corresponding to the minimum of river depth which almost have values below 4 meters. Thus, this river portion was an obstacle for the river flow in Lam Pachi river and had to be resolved this problem further.