A GIS-Based Analysis for Mapping the Distribution of Seaweed Cultivation Area in East Lombok Southern Coastal Waters

The analysis employed in geographic information systems is an analysis using GIS (Geographic Information Systems) software as in land mapping or the like. GIS-based analysis can provide information that the potential distribution of seaweed cultivation area owned by the local territory is assuredly propitious; and for that reason, it needs to be maintained wisely for the people welfare. The objectives of this study are to find out the distribution of the potential seaweed cultivation area and to obtain the database on the suitability of seaweed cultivation area in the south waters of East Lombok. This research employs survey approach since it utilizes the existing data for gaining the problem solution rather than hypothesis testing. The instruments deployed in the process of the research are some equipment such as ships, GPS, current kites, measuring signals, thermometer, geological compasses, stopwatch, secchi disk, basic diving equipment, salinometer, and a GIS-based analysis software. The data of the research are carefully collected through observation method, documentation, and experiments. The result of the study shows that the total area of 606.936 ha are classified into suitable category (S2) 47.27%, not suitable area (N) 46.37% and highly suitable area (S1) 6.36%.


c.
Transparency.The transparency of Ekas bay is seen at 0.30 -7.00 meter, meaning that it is highly suitable (S1) to the level of suitable (S2).Serewe Bay belongs to highly suitable (S1) and some parts are suitable (S2) with 0.5 -4.00 meter.
With the range of 0.5 -5.00 meter, Jukung Bay is categorized into highly suitable (S1) and some suitable (S2).
of coastal and waters area by utilizing the Geographic Information Systems (GIS).GIS is chosen to portray the mapping of seaweed cultivation area distribution.A GIS-based analysis is used to identify the potential resources in the coastal area on a global scale which can be done effectively and accurately.The problem statement of this research is: the potential and the form of distribution of seaweed cultivation area in the southern waters of East Lombok.The purpose of this study is to analyze the potential distribution of seaweed cultivation area and then create a map by utilizing Geographical Information Systems (GIS).The GIS analysis is undertaken by referring the database about distribution of seaweed cultivation area in the southern waters of East Lombok.The database were obtained by survey and mapping.The result of study, therefore, is expected to contribute as the database for mapping the distribution of seaweed cultivation in the local coastal area to be used in the socio-economic empowerment for the local community.The database can be referred as a guide to develop the coastal and waters area in East Lombok.area and its dynamics.In GIS analysis, land classification can be done based on its designation.The classification of land capability can be referred as a guidance for the land use planning.Moreover, it is also useful as a strategic planning tool in responding the climate change issue (Brown et al., 2009).The physical mapping of a land can explain its suitability level while the economic mapping shows its feasibility level.Based on the result of qualitative land mapping (physical) followed by quantitative (economic) and supported by specific data of location, a land use direction is produced and then received by the local coastal community.Ali, 2015).By the support and encouragement of the central government with the concept of global maritime axis, the improvement capacity and productivity of coastal area and domestic waters towards marine products such as seaweed, fisheries and its processed products, sea transportation, marine tourism, and the other marine industries will be increasing.It is in line with Budiharsono's idea (2001; 16), he states that the opportunity of maritime sector development and its impact on the development of coastal and oceanic areas in the future is quite promising 4 .Seaweed commodity is one of biological resources found in the coastal and ocean.According to Akmal (2008), the increasing productivity and quality of seaweed and optimizing the utilization of Indonesian marine could be the effective way to develop the seaweed cultivation.Seaweed becomes potential marine commodity to be developed in this recent days.Therefore, this research is carried out with consideration of the potential and feasibility of area to foster the local community welfare.The parameter of target seaweed cultivation area are as follows: 1) Flow Rate, 2) Wave, 3) Nitrate, 4) Phosphate, 5) Transparency, 6) Tides, 7) Temperature, 8) pH (Acidity), 9) DO (Dissolved Oxygen), 10) Depth.Geographic Information Systems (GIS) analysis for mapping the distribution of seaweed cultivation areas in the southern waters of East Lombok will result in map and database.The result is expected to contribute for improving the socioeconomic life towards the prosperous community.

Figure 1 .
Figure 1.The Framework of the study B. RESEARCH METHOD

Figure
Figure 2. Map of Sampling Location The salinity level of Ekas Bay is on 33 -40 ppt, so it belongs to suitable (S2) and some are dispersed in not suitable (N).Serewe Bay salinity is at 36 -37 ppt showing the suitable level (S2).Besides, the salinity 35 -38 ppt for Jukung Bay meaning that suitable (S2) but more dominantly to not suitable (N).

Table 2 .
Suitability Matrix for Seaweed Cultivation