Judul: Identifikasi Kejadian Banjir Rob (Pasang) di DAS Sunter pada 9-13 Januari 2008.
Abstrak: Banjir Rob merupakan fenomena meluapnya air laut ke daratan, istilah tersebut pertama kali dikenal di daerah Semarang. Fenomena banjir Rob dipengaruhi oleh pasang surut air laut. Pasang surut sendiri dipengaruhi gravitasi bulan dan matahari, serta dipengaruhi pula posisi bulan dan matahari terhadap bumi. Banjir ini biasa terjadi pada saat pasang air laut yaitu bertepatan dengan kejadian bulan baru dan bulan purnama. Pada bulan Januari 2008, di wilayah utara Jakarta yang berbatasan dengan laut, fenomena banjir Rob (pasang) melanda kawasan tersebut. Fenomena ini mengakibatkan sejumlah kawasan di wilayah utara Jakarta terendam air laut, hal ini diperburuk dengan penurunan muka tanah Jakarta. Selain dilanda banjir pasang air laut, kawasan utara Jakarta sering dilanda banjir akibat luapan sungai-sungai yang bermuara di Jakarta, salah satu sungai yang menyumbang banjir Jakarta adalah sungai Sunter. Tutupan lahan di DAS Sunter yang sebagian besar berupa pemukiman makin meningkatkan limpasan permukaan ketika terjadi hujan. Tanggal 9-13 Januari 2008 di perairan Teluk Jakarta sedang terjadi pasang air laut karena bertepatan dengan bulan baru yang mengakibatkan terjadinya banjir Rob di beberapa wilayah di Jakarta Utara, termasuk DAS Sunter. Berdasarkan pemetaan banjir Rob di DAS Sunter pada tanggal 9-13 Januari 2008 diketahui bahwa daerah yang tergenang air laut yaitu Kalibaru dan Marunda dengan tinggi genangan 48-72 cm. Luas genangan maksimum terjadi pada tanggal 11 Januari 2008 yaitu sebesar 66.000 m2. Pada tanggal 9-13 Januari, DAS Sunter tidak ikut menyumbangkan limpasan permukaan yang dapat menyebabkan banjir karena nilai limpasan permukaan berkisar 0-3,03 mm. Sehingga kejadian banjir pada tanggal 9-13 Januari 2008 di DAS Sunter hanya berasal dari pasang air laut. Kata Kunci : Banjir Rob, Pasang-Surut, Limpasan Permukaan, DAS Sunter.
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Judul: Analisis daerah genangan banjir rob (pasang) di pesisir utara Jakarta menggunakan data citra satelit SPOT dan ALOS
Abstrak: Most of the land area of the northern coast of Jakarta is a result of reclamation of mangrove forest area, thus changing the shoreline and mangrove buffer function vanish. Effect of shoreline phenomena such as tidal flood rob), it makes some parts of the region including the northern coast of Jakarta which has a coastline along the 32 km flood affected by tidal flood (rob). Floods tidal (rob) occur when sea water runoff to the mainland every time the high tides that inundate the region is lower than the average sea level. Effect of population makes land a solid building, make change in land cover wet into dry land by the construction of wet areas resulting from land use changes. Through the results of land use change, coastlines changes and inundation prediction using data of sea level rise can be explained tidal flood (rob). SPOT (2003) and ALOS (2008) satellite imagery can explain land cover changes over the past five years, and the value of sea level rise per year to predict inundation within the next ten years. Because of changes in coastal land, coastline changes that lead to the addition of soil (accretion) and a decrease in surface (abrasion). Addition of soil (accretion) explains the more advanced the shoreline that have an impact on the pool of sea water at high tide when the maximum occurs. Based on field surveys carried out, explaining that changes in the research area of coastal land cause tidal flood (rob). Inundation predictions using DEM-GDEM data 30 m, the level of the value of the coastline and the sea rose to explain the occurrence of inundation in coastal areas north of Jakarta in 2019. The results obtained from several methods to explain the inundation occurred in the same area, so that could explain the relevance of changes in land and sea level rise which resulted in tidal flood (rob) event.
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Judul: Apatite Growth Optimation on Chicken Mucouse by Fourier Transform Infrared (FTIR) Characterization
Abstrak: Some experiment had been conducted to grow apatite from supersaturated solution of calcium phosphate ions on chicken mucouse. The calcium and phosphate ions were originated from Ca(NO3)2 and (NH4)2HPO4. Carbonate ions from (NH4)2CO3 was also used as starting solution. Experiment was carried out within about 5 hours at temperature 370 C and pH 7. Value of Ca+ : PO4 3- was 1.67, while molar ratio of CO3 2- : PO4 3- was 0.5 : 1. Molarity of molar ratio CO3 2- : PO4 3- variated approximately 0.15 : 0.30, 0.51 : 1.02, and 0.90 : 1.80. Mass of mucouse powder was constant 0.75 gram. The analysis result of Fourier Transform Infrared (FTIR) showed that the precipitation was apatite carbonate type A and B. In these experiment it was found out that the mucouse reduce the crystallinity of apatite precipitant, and the growth of apatite crystal was optimum at solution with molar ratio CO3 2- : PO4 3- about 0.15 : 0.30.
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