Teluk Saleh terletak di sebelah timur laut Pulau Sumbawa, Nusa Tenggara Barat (NTB). Secara administratif, Teluk Saleh berada di dua kabupaten, yaitu Kabupaten Sumbawa dan Kabupaten Dompu. Teluk Saleh merupakan pusat kegiatan perekonomian laut yang dimanfaatkan sebagai lahan budidaya laut seperti budidaya rumput laut dan budidaya keramba jaring apung (KJA). Penelitian ini dilakukan pada tanggal 19 – 25 Mei 2016 di perairan Teluk Saleh, Kabupaten Dompu, NTB. Tujuan penelitian ini adalah untuk memperoleh variabilitas parameter kualitas air untuk budidaya laut. Pengambilan data kualitas perairan dilakukan secara purposive sampling dengan menggunakan alat multiparameter WQC-24. Parameter yang diukur yaitu parameter fisika; kecepatan arus, padatan tersuspensi (TSS), padatan terlarut (TDS), kecerahan, kekeruhan, dan suhu. Parameter kimia; kebutuhan oksigen biologis (BOD), oksigen terlarut (DO), derajat keasaman (pH), kadar amonia, dan unsur hara (Nitrat-NO3, Fosfat PO4 dan Klorofil-a). Analisis data dilakukan secara deskriptif menggunakan analisis PCA (Principal Component Analysis). Hasil analisis data menunjukan bahwa suhu, salinitas, DO, dan pH berada pada ambang normal antara 25 - 31 oC, 32 – 34 ppt, 5mg/l dan 8, yang artinya bahwa perairan di daerah penelitian secara umum tergolong perairan dengan produktifitas yang tinggi. Terdapat beberapa parameter yang masih melebihi baku mutu untuk budidaya laut yaitu parameter fosfat dan nitrat. Nilai konsentrasi nitrat kurang dari 0.1mg/l diduga sebagai akibat dari aktivitas perekonomian masyarakat di sekitar muara sungai yang membuang limbah ke perairan. Berdasarkan analisa PCA didapatkan parameter yang berperan kuat di lokasi adalah arus dan TSS.
This paper will describe a study to find out the shoreline changes that occurred on Cemara Besar Island along with the accretion and abrasion. Data taken from the images was obtained through google earth as a result of radiometry and geometry correction from Landsat satellites in the last 5 years. Wind data is obtained from ecmwf interm every season for 5 years. Analysis of shoreline changes was carried out using the DSAS (Digital Shoreline Analysis) method and analyzed by wind and sea wave factors in each season. The results of the analysis obtained LRR and EPR values for 5 years, the extent of changes in island land mass, the value of Hs and Ts from the results of wave forecasting using wind data. To simplify the analysis, Cemara Besar Island is divided into 9 segments based on variations in LRR values. The results show that in general Cemara Besar Island have very high accretion in segments A, B and E with an average of 3.61 m and very high abrasion occurred in segment F with an average of -1.01 m. Abrasion occurs with the greatest speed of change in segment A with an average of 4.64 m/year and the largest accretion rate in segment F with an average of -1.21791 m/year. Analysis of oceanographic factors through wave forecasting shows that in the west and transition I season, waves occur with Hs 1.21 m, greater than the eastern season and transition II season with Hs 0.91 m. wind direction from north dominant direction 377.50 in west season and transition I, and from east direction 67,25 in east season and transition I season. Direction of wind blowing influences wave propagation and direction of wave coming towards shore which affects sediment transport which produces accretion and abrasion on the Cemara Besar Island.
As a small island and tourist destination, Karimunjawa municipal is need fresh water to support the tourist activity, mainly to supply drinking water. Unfortunately, freshwater on a small island is obtained from groundwater which is very limited and vulnerable to climate change and anthropogenic activities. A groundwater assessment is necessary to receive up-to-date information on groundwater quality, to assess the groundwater feasibility for drinking water, and determine the pollutant source. The assessment was conducted by collected groundwater sampling from dug wells and swamp area in Karimunjawa municipal and then analyzed the samples in the laboratory to obtain the value of Nutrient (NO3-, NO2-, NH3-N); Heavy Metals (Cu, Fe, and Pb); and Salt (TDS, Cl-, Na+). These obtained parameters were compared with the quality standard of the minister of health regulation of the Republic of Indonesia about water quality standards for drinking water. In this study, 14 samples were collected and analyzed. The result shows that nutrient contaminant is low, but some groundwater sample was contaminated by ammonia. Heavy metal is undetectable, but almost all samples are contaminated by salt. Therefore, the groundwater in Karimunjawa municipal experienced seawater intrusion and not feasible to be consumed as drinking water.
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