most of coastal area is dominated by fishpond. Agriculture land and forest are distributed behind fishpond area. The existence of these landuse types is possible
to increase fishpond area with some requirements, which are suitable for fishpond and supporting local community. This requires some evaluation are not only on
physical aspects but also on economic and administrative aspects. Meanwhile, any landuses that are impossible to change to become fishpond settlement, river, lake
have limited area.
4.2.2. Hydro-Oceanography Characteristics
Marine overview was the result of field surveys conducted by Bakosurtanal and Bogor Agriculture University 2004. The field surveys were done to acquire
in-situ measurement, water sample and soil for analysis. Location of sample point
is represented in Fig 4.8, while measuring result is shown on appendix 1. Determining sample point was not done by systematic method, but using
purposive method, where placement of sample point was done using judgment, for
example: obtaining water sample was performed closer in near land, especially in delta area, because the variability is higher than other area. The observation
density is lower towards offshore, where variability is lower than closer to land. Nevertheless, placement of observation point was still done by referring to sea
condition; hence all sample points can represent most of the sea conditions.
4.2.2.1. Physical Hydro-Oceanography Sechi Disk Depth Brightness of Water
Sechi disk depth is one of the oceanography parameters that influence sea
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54 condition. Sechi disk depth shows how deep sun light penetrates the water
column. Sechi disk depth level is influenced by turbidity, sedimentation, algae density, phytoplankton, and pollutant.
Sechi disk depth is usually called as brightness of water, and used for tourism and marine cultivation suitability analysis. For marine cultivation
seaweed and kejapung, brightness levels was used as indicator of water quality for seaweed and ”kejapung” requirement.
Generally, brightness of water is between 40 cm to 1200 cm. Its means, brightness of water is still clear. Lowest brightness was found on area near
Binangasangkarak estuary. This was due possibly to the sedimentation contribution of Binangasangkarak river to surrounding estuary. The brightness
value increases away from the land. Sechi disk depth level can also be presented into percent towards
depth. Conversion of depth was done by predicting depth point on every sample point using bathymetric map of Dishidros Hydrology and Oceanography
Agency, 2002, with 1 : 50.000 scale. Sechi disk map in percent is represented on Fig 4.10.
Salinity
Salinity is the concentration of salt average, it is one of the parameters used for land suitability evaluation. Generally, salinity on research area is
approximately 35 ppm.
Fig 4.7. Landuse Map
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Fig 4.8. Sample Points Map
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Fig 4.9. Sechi Disk Depth Map
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Fig 4.10. Sechi Disk Depth Map
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Temperature
Temperature is one parameter that influences number of oxygen directly. Water temperature will influence chemical and biology processing velocity.
Temperature change on sea surface influences life circle of fish and seaweed. Distribution of temperature is presented in Fig 4.11. Generally, distribution of
temperature on research area is homogeneous, ranging between 26 C – 29
C.
Current Velocity
Current velocity data was acquired from Dishidros. These data cover 1 year time period. From data observation, current velocity on research area is
varied, but is extreme between April and October. Current velocity is presented in Fig 4.12.
Current velocity distribution gives an overview of current on Maros and its surroundings. Spatial data for current velocity interpolation used only 5 sample
points from current observation buoys of Dishidros Dishidros, 1995. Data of Indonesia current velocity map at 1 : 50.000 scale is available, where Maros is
covered by 5 observation points.
Water Depth
Topography of marine in Maros and surroundings is relatively heterogeneous. In the eastern part approximately 1500 m from coastline,
topography of marine has depth about 1 – 10 m. While, in the western part over than 1500 m from coastline, the depth of water is relatively steep 10 m – 30
m. The map is shown in Fig 4.13.
