TY - JOUR
T1 - Sand dynamics as a tool for coastal erosion management
T2 - A case study in Darwin Harbour, Northern Territory, Australia
AU - Tonyes, Silvia Gabrina
AU - Wasson, Robert
AU - Munksgaard, Niels
AU - Evans, Kenneth
AU - Brinkman, Richard
AU - WILLIAMS, D
PY - 2015
Y1 - 2015
N2 - Darwin Harbour, Northern Territory, Australia, is a semi diurnal macro-tidal embayment that is situated in a cyclone prone area. The tidal variations range up to 8 m with a mean tidal range of 3.7 m. The coastal area consists of mangrove fringes, sandy beaches, tidal flats, rocky shore platforms and coastal cliffs. The main morphological changes are movement of the sandbars and erosion of beaches and coastal cliffs. Sea level rise due to climate change and more intense cyclones and storm surges may exacerbate these processes with detrimental impacts on the coast and the adjacent city, particularly when occurring at high tide. To assist with coastal erosion management, a greater understanding of morphological changes is required. A two-dimensional depth averaged finite-element hydrodynamic model (RMA-2), coupled with a sediment transport model (RMA-11) from Resource Modelling Associates, have been used to deduce the sources and spatial patterns of sand erosion and deposition in the harbour. Geochemical analysis is also used to characterize the sand source(s). This paper presents hydrodynamic simulations focusing on culturally and recreationally significant beaches in Fannie Bay. Simulations indicate that the Cullen Bay sandbar is an indirect sand source replenishing Fannie Bay beaches. Respective geochemical results also show similar Rare Earth Element contents of the sand in the area. Considering the fast pace of development in and around Darwin Harbour, this study is essential in providing a fundamental understanding of coastal processes and to assist coastal and shoreline management in a tropical estuary. � 2015 The Authors. Published by Elsevier Ltd.
AB - Darwin Harbour, Northern Territory, Australia, is a semi diurnal macro-tidal embayment that is situated in a cyclone prone area. The tidal variations range up to 8 m with a mean tidal range of 3.7 m. The coastal area consists of mangrove fringes, sandy beaches, tidal flats, rocky shore platforms and coastal cliffs. The main morphological changes are movement of the sandbars and erosion of beaches and coastal cliffs. Sea level rise due to climate change and more intense cyclones and storm surges may exacerbate these processes with detrimental impacts on the coast and the adjacent city, particularly when occurring at high tide. To assist with coastal erosion management, a greater understanding of morphological changes is required. A two-dimensional depth averaged finite-element hydrodynamic model (RMA-2), coupled with a sediment transport model (RMA-11) from Resource Modelling Associates, have been used to deduce the sources and spatial patterns of sand erosion and deposition in the harbour. Geochemical analysis is also used to characterize the sand source(s). This paper presents hydrodynamic simulations focusing on culturally and recreationally significant beaches in Fannie Bay. Simulations indicate that the Cullen Bay sandbar is an indirect sand source replenishing Fannie Bay beaches. Respective geochemical results also show similar Rare Earth Element contents of the sand in the area. Considering the fast pace of development in and around Darwin Harbour, this study is essential in providing a fundamental understanding of coastal processes and to assist coastal and shoreline management in a tropical estuary. � 2015 The Authors. Published by Elsevier Ltd.
KW - Analytical geochemistry
KW - Beaches
KW - Climate change
KW - Coastal zones
KW - Exploratory geochemistry
KW - Finite element method
KW - Fluid dynamics
KW - Geochemistry
KW - Hydrodynamics
KW - Morphology
KW - Sand
KW - Sea level
KW - Sediment transport
KW - Sedimentation
KW - Sediments
KW - Storms
KW - Tides
KW - Coastal erosion
KW - Darwin Harbour
KW - Geochemical analysis
KW - Hydrodynamic simulation
KW - Morphological changes
KW - Sediment provenance
KW - Sediment transport model
KW - Shoreline management
KW - Erosion
UR - http://www.scopus.com/inward/record.url?scp=84960931831&partnerID=8YFLogxK
U2 - 10.1016/j.proeng.2015.11.032
DO - 10.1016/j.proeng.2015.11.032
M3 - Article
VL - 125
SP - 220
EP - 228
JO - Procedia Engineering
JF - Procedia Engineering
SN - 1877-7058
ER -