Introducing A New Hazard Index: Salinity Hazard Assessment in Coastal Estuaries

Authors: Rabeya Akter*, Ohio University
Topics: Coastal and Marine, Hazards, Risks, and Disasters, Marine and Coastal Resources
Keywords: Non Dimensional Index of Salinity, NDIS, Salinity Hazard, Coastal Estuaries
Session Type: Paper
Day: 4/5/2019
Start / End Time: 3:05 PM / 4:45 PM
Room: Jackson, Marriott, Mezzanine Level
Presentation File: No File Uploaded

Salt water intrusion is a complex and dynamic process and governed by the related parameters that play important role in controlling the intrusion process. Traditionally, surface water salinity hazard is expressed in scientific studies through salinity magnitude only. However, assessment of many hydrological hazards associates with their dominant parameters and in many cases there are established hazard index that can represent the hazard in a quantifying scale. This research aims to develop a salinity hazard index that is not based on salinity magnitude only rather incorporates associated influencing parameters of salinity intrusion process as well. Calibrated and validated Delft3D salinity model was applied to calculate the spatial-temporal variability of associated parameters along the Bangladesh coast. Results indicated that salinity hazard index value follows the general pattern of salinity magnitude but not following a linear relation. It is observed that in present condition, salinity hazard is lowest in central coast whereas highest in western coast. Two scenarios associated with sea level rise were also considered to apply the hazard index and detect its change in changing climatic condition. Salinity hazard assessment through this new index represent salinity intrusion process better and can be beneficial in hazard or coastal management aspects.

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