Environmental Flow for Sungai Johor Estuary

A.Kadir Adilah,Baharim N Bakhiah,Yusop Zulkifli,Z Noor Zainura,N Mohamed Noor,A.W Azhari

doi:10.1051/e3sconf/20183402041

Abstract

Sungai Johor estuary is a vital water body in the south of Johor and greatly affects the water quality in the Johor Straits. In the development of the hydrodynamic and water quality models for Sungai Johor estuary, the Environmental Fluid Dynamics Code (EFDC) model was selected. In this application, the EFDC hydrodynamic model was configured to simulate time varying surface elevation, velocity, salinity, and water temperature. The EFDC water quality model was configured to simulate dissolved oxygen (DO), dissolved organic carbon (DOC), chemical oxygen demand (COD), ammoniacal nitrogen (NH3-N), nitrate nitrogen (NO3-N), phosphate (PO4), and Chlorophyll a. The hydrodynamic and water quality model calibration was performed utilizing a set of site specific data acquired in January 2008. The simulated water temperature, salinity and DO showed good and fairly good agreement with observations. The calculated correlation coefficients between computed and observed temperature and salinity were lower compared with the water level. Sensitivity analysis was performed on hydrodynamic and water quality models input parameters to quantify their impact on modeling results such as water surface elevation, salinity and dissolved oxygen concentration. It is anticipated and recommended that the development of this model be continued to synthesize additional field data into the modeling process.

Highlights

Estuaries face a host of common challenges
All model coefficients should be consistent between the calibration period and the verification period
The method used in determining the values for the model coefficients is essentially one of trial and error

Summary

Introduction

Estuaries face a host of common challenges. As more people flock to the shore, we are upsetting the natural balance of estuaries and treating their health. We endanger our estuaries by polluting the water and building on the lands surrounding them. The primary purpose of the study is to apply hydrodynamic model and water quality model to Sungai Johor estuarine system using EFDC.

Objectives

Results

Conclusion