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Abstrak :
ABSTRAK
Peatland fires encourage the government to restore peat function as natural water storage. One of the measures taken is to build a circumference dike to hold water to reduce excessive drainage. However, there is no study yet of the planned average water level that has to be maintained from the construction of circumference dike. Therefore, the aim of this study is to calculate the average water level on peatlands inside the circumference dike. The methods used consist of hydrological analysis, spatial analysis, and water level analysis. The results of the analysis shows that the average water level in normal years tends to be above the surface, except in the second half of August to the first half of November. In the second half of September to the second half of October, the peat has the potential to be burned. In a dry season the water tends to fall decline to the drainage boundary of peatland which is at -1.5 m which occurs in the second half of March to December. In the second half of February until December peatland has potential to be burned. From this research, it can be concluded that the calculations using this method is similar with in-situ observation data and can be used to calculate the average water level of peat with the same conditions in other locations.

Abstrak :
ABSTRAK
Mangroves in Indonesia have a large enough area, but in the last 3 decades the area has been reduced to 40%. Besides having a function as a coastal protector, mangroves are also able to maintain the quality of the waters around it. Currently, the construction of a reclamation island in Jakarta Bay is being carried out which will have an impact on the surroundingmangrove forests. Therefore, the purpose of this study was to identify the impact of island reclamation in Jakarta Bay onsedimentation and mangrove growth in surrounding area. This research was conducted with literature studies, vegetation analysis, water quality analysis and also spatial analysis with WorldView-2 satellite imagery. The results showed that the mangrove forests on the coast of North Jakarta, especially in the Muara Angke area tend to increase, especially in the reclaimed island area. The mangrove stands increase by approximately 1.32 ha / year. The density and stem diameters vary in 5 locations. Oxygen levels at the study site are very low but the existing mangrove forests can absorb dissolved heavy metals. The results of the study also show that the area that has the potential to be planted with mangroves is 30 ha. Overall, the sedimentation process helps expand mangrove forests naturally while the bad quality of water does not significantly affect the development of mangroves. On the contrary, the existing mangrove is able to keep the stability of the water quality in surrounding area.

Abstrak :
Mangrove di Indonesia mempunyai luasan yang cukup besar, akan tetapi dalam 3 dekade terakhir luasannya berkurang hingga 40%. Mangrove selain mempunyai fungsi sebagai pelindung pesisir pantai juga mampu menjaga kualitas perairan di sekitarnya. Saat ini, sedang dilaksanakan pembangunan pulau reklamasi di Teluk Jakarta dimana akan memberikan dampak terhadap hutan mangrove yang ada di sekitarnya. Tujuan dari studi ini adalah untuk mengetahui dampak reklamasi pulau di Teluk Jakarta terhadap sedimentasi dan perkembangan mangrove disana. Penelitian ini dilakukan dengan studi literatur, analisis vegetasi, analisis kualitas air dan juga analisis spasial dengan citra satelit WorldView-2. Hasil dari penelitian ini menunjukkan bahwa hutan mangrove yang ada di pesisir Jakarta Utara khususnya di kawasan Muara Angke cenderung meningkat terutama di areal pulau reklamasi. Tegakan mangrove bertambah luas kira-kira 1,32 ha/tahun. Hasil analisis menyimpulkan nilai kerapatan dan diameter batang yang berbeda-beda di 5 lokasi. Kadar oksigen di lokasi penelitian sangat rendah akan tetapi hutan mangrove yang ada mampu menyerap logam berat yang terlarut. Hasil penelitian juga menunjukkan bahwa luas areal yang berpotensi untuk ditanami mangrove adalah 30 ha. Secara keseluruhan, proses sedimentasi membantu perluasan hutan mangrove secara alami sedangkan kualitas air yang buruk tidak terlalu berpengaruh terhadap perkembangan mangrove. Justru sebaliknya, mangrove eksisting mampu menjaga kualitas air di sekitarnya tetap stabil