Obtaining a representative bathymetry of a shallow estuary for numerical modelling : Maketu Estuary (CROSBI ID 515744)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Domijan, Nenad ; Black, Kerry ; Healy, Terry ; Immenga, Dirk
engleski
Obtaining a representative bathymetry of a shallow estuary for numerical modelling : Maketu Estuary
Numerical modelling of estuarine hydrodynamics usually requires simplifying assumptions such as steady state or “ a representative bathymetry” . A real estuary is never in a steady state and its coastline geometry and bottom topography are usually complicated, and numerical models are often needed. However, the accuracy and efficiency of numerical finite difference models in reproducing the tidal distribution and water movement in time and space depend partly on the quality of the bathymetry employed. Hydrographic surveys in the shallow Maketu Estuary (<3 m depths) were undertaken in October-November 1996 and February 1997. Many problems that are not encountered in deep sea surveys are present in shallow estuaries. A novel technique to survey from a jet ski with differential GPS and a high-resolution sounder with 1 cm vertical accuracy was developed. The data logging equipment was housed in a water-proof box containing a portable computer and power supply. The transects are generated using HYDRO 6 software. In this paper, data processing and computer-assisted map design techniques and the high-resolution bathymetric maps are presented. A comparison of these maps to aerial and ground photographs is undertaken to check the reproduction of bottom topography and errors are discussed. The bathymetry survey was also used to estimate the coefficients of the bottom friction on the shallow banks and in the channels, covered by different types of sediment.
Numerical modelling; bathymetry; shallow estuary
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Podaci o prilogu
51-52-x.
1997.
objavljeno
Podaci o matičnoj publikaciji
Programme and abstracts, Integrated Approaches to Marine Science
Russ Babcock
Auckland: School of Environmental and Marine Science, The University of Auckland, NZ
Podaci o skupu
Integrated Approaches to Marine Science, Joint Conference AMSA and NZMSS
predavanje
08.07.1997-11.07.1997
Auckland, Novi Zeland