Kuala Selangor Estuary Salinity Intrusion Modeling during Extreme Flood Events

Nuryazmeen  Farhan Haron; Wardah  Tahir; Lee  Wei-Koon; Siti Nurhayati  Mohd Ali; Mohammad Naser  Sediqi

Authors

Nuryazmeen Farhan Haron School of Civil Engineering, College of Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
Wardah Tahir School of Civil Engineering, College of Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
Lee Wei-Koon School of Civil Engineering, College of Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
Siti Nurhayati Mohd Ali School of Civil Engineering, College of Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
Mohammad Naser Sediqi Green Goal Initiative, Tohoku University, Japan

Keywords:

Shallow water model (SWM), transverse flow, salinity intrusion, extreme flood event, Kuala Selangor

Abstract

The occurrence of extreme flood events causes flood plain inundation and sedimentation. In the estuary, these processes lead to salinity changes, which adversely affect the estuarine ecosystem. A shallow water model (SWM) had been used for the Selangor River estuary up to Kg. Asahan station, the limit of saline water intrusion. The performance of the model has been verified using two decades of observed data. The model was used to simulate flood events in Kuala Selangor to investigate salinity intrusion attributed to transverse flow during extreme flood events. Analysis shows that as the annual recurrence interval increases, the flood depth increases, but the salinity level reduces due to the dilution effect from the riverine fresh water inflow.