ANALYSIS OF CHLOROPHYLL-A VARIABILITY BASED ON CLIMATE FACTORS, RAINFALL AND SEA SURFACE TEMPERATURE USING REMOTE SENSING METHOD IN MUARA MUSI

• Main Author: Iqbal Firdaus, Muhamad
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/75809
• Institution: Institut Teknologi Bandung

South Sumatra, as a Fisheries Management Region of the Republic of Indonesia, abbreviated WPPNRI, requires a high standard of water quality. The increase in chlorophyll-a concentration is one of the global environmental issues that can result from water contamination caused by changes in human activities that are carried out intensively. Climate, weather, and seasonal fluctuations can influence the distribution of chlorophyll-a concentrations in a body of water. The satellite, in the form of Aqua MODIS (Moderate Resolution Imaging Spectroradiometer), is used to determine the distribution of chlorophyll content over an extended period of time and on a large scale. From 2003 to 2022, chlorophyll-a concentrations were distributed monthly over a 20-year period. In 2022 and 2010, the concentration of chlorophyll-a increased, whereas it decreased in 2009 and from 2012 to 2013. Muara Musi is geographically included in the monsoonal rain pattern, but actual data demonstrates the pattern of the Inter-Tropical Convergence Zone (ITCZ), with the value of rainfall intensity in the dry season of August reaching 83.29 mm. Comparing the concentration of chlorophyll-a in September to the ITCZ rain pattern, a downward trend was observed, as was a decrease in the intensity of rainfall in September. In contrast, by the end of the year, both variables had increased. Analysis based on seasonal data shows the ratio of chlorophyll-a concentration value to IOD is inversely proportional; when the value of chlorophyll-a concentration increases, the IoD index shows a negative value, and vice versa, when the value of chlorophyll-a concentration decreases, a positive IOD occurs. This is similar to the seasonal analysis that revealed an inverse relationship between the value of chlorophyll-a concentration and MEI. When the value of chlorophyll-a concentration increases, the ENSO index indicates La-Nina conditions, whereas if the value of chlorophyll-a concentration decreases, El-Nino conditions occur. The simultaneous occurrence of negative IOD and La-Nina in 2010 and 2022 was accompanied by an increase in chlorophyll-a concentration. Seasonal analysis reveals that the relationship between chlorophyll-a concentration value and rainfall intensity is directly proportional, such that as chlorophyll-a concentration value increases, so does rainfall intensity value. The value of chlorophyll-a concentration can increase when precipitation intensity is high due to the prediction of potential emissions from non-point source pollutants transported to the receiving water body by runoff or runoff water. The correlation value between EOF 1 chlorophyll-a and EOF 1 SPL is 0.3338, which indicates that when the value of the EOF 1 chlorophyll-a anomaly is positive, the value of the EOF 1 SPL anomaly also increases. Next, a significance test was conducted, resulting in the value of the eof 1 chlorophyll-a variable with eof 1 SPL being 0.00001. For each increase in the chlorophyll-a concentration, the variable IOD value decreases. This is because the correlation between the variable concentration of florofil-AA and IOD is -0.1509. The value of significance between variables 1 chlorophyll-a and IOD is 0.0227. The correlation between the value of the eof1 concentration of chlorophyll-a and the value of the variable intensity of anomalous rainfall indicates that if the value of the eof1 concentration of chlorophyll-a has increased, so has the value of the variable intensity of anomalous rainfall. 0.1618 correlation value. The significance value between the variables chlorophyll-a and atypical precipitation is 0.014. There is an increase in the predictive value of prospective land-based TN and TP emissions. In 2002, the value of nutrient TN was 275433.13 kg/year, and the value of nutrient TP was 128455.14 kg/year. In 2021, the value of nutrient TN will be 487743.52 kg/year, and the value of nutrient TP will be 232583.77 kg/year. Muara Musi has a mesotrophic trophic level, and based on the results of the analysis in July and August, it has a eutrophic trophic level. The management of nutrients must be consistent from both a non-technical and a technical standpoint, and it must be performed continuously. This action was taken in an effort to reduce the amount of pollution entering receiving water bodies.