Assessment of Water Quality in Coastal Estuaries Under Impact of Industrial Zone in Hai Phong, Vietnam

Publication date: Available online 3 April 2019Source: Physics and Chemistry of the Earth, Parts A/B/CAuthor(s): Doan Quang Tri, Nguyen Thi Mai Linh, Quach Thi Thanh Tuyet, Tran Anh Phuong, Nguyen Cao DonAbstractThe purpose of this study is to apply numerical modeling to assess the water quality in Cam and Lach Tray coastal estuaries. The wind re-analysis data from Weather Research and Forecasting (WRF) model were used to simulate wave and the hydrodynamic regimes with a definition of 14 km within the longitude range from 1050E to 1200E and latitude range from 50 to 220 in the study area. The calibration and validation results for the wind-wave, hydrodynamic regimes showed that the performance of 2D hydrodynamic model is extremely good with a Nash coefficient ranges from 0.89 to 0.92, an RMSE-observations standard deviation ratio (RSR) varies from 0.25 to 3.6 and a Percent bias (PBIAS) is from -4.2% to 0.2%. The calibrated 2D hydrodynamic model are combined with the Ecolab model to evaluate and simulate the spreading of water quality parameters (BOD, NH4+, and TSS). During the high tides, the tidal moves into the river, and therefore, the spread of water quality parameters are slow around the coastal estuaries. By contrast, in the low tide period, the streamflow moves outside the sea so the water quality parameters are greater than at the coastal estuary. The water quality parameters contain BOD (16.5 mg/l to 22.5 mg/l), NH4+ (0.003 mg/l to 0.009 mg/l), and TSS (29.63 mg/l to...
Source: Physics and Chemistry of the Earth, Parts ABC - Category: Science Source Type: research