BUPATI KOTAWARINGIN TIMUR PROVINSI KALIMANTAN TENGAH

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CEKUNGAN PEMBENTUK BATUBARA

The article will explore on thought of local sufi, Panglima Utar (Mukhtar bin Abdurrahim) who comes from West Kotawaringin, Central Kalimantan, with a focus on the only manuscripts bequeathed by its author. Manuscript provide valuable information about the continuity of thought Panglima Utar with the teachings of Sufism established in Kalimantan, which is formed from the seventeenth and eighteenth centuries. In this manuscript he describes the position of teachers for Sālik, the shape of dhikr and wird as well as the final aim, and the doctrine of ma'rifah Allāh.

The Western part of East Kutai District, East Kalimantan Pronvince have an interesting coal potential. This area is in the Nothern part of Kutai Basin that consist of Tertiary sediment of Marah Formation, Batuayau Formation, Wahau Formation and Balikpapan Formation in Eocene until Mio-Pliocene Age. The unconformity among Batuayau, Wahau and Balikpapan Formation caused by tectonic activity in Oligocene, Miocene and Pliocene. Coal bearing formation in this area are Batuayau Formation, Wahau Formation and Balikpapan Formation. Distribution of coal in those formations formed within synclinal fold ; the direction of fold axis is North -South to Northeast -Southwest. There are two until five main coal seams in those formations with maximum thickness is 26.80 m No different coal quality evidence among the three formations. Coal of Batuayau Formation characterized by ash content 2.26 -9.37% (adb, average 5.81%, Sulphur content 0.15 -0.35% (adb), average 0.21% and Calorific Value 5100 -5620 cal/gr, average 5440 cal/gr. Coal of Wahau Formation characterized by ash content 2.28-12.40 % (adb), average 4.96 %, Sulphur content 0,11-0,45% (adb), average 0.17 % and Calorific Value 4870 -5595 cal/gr, average 5375 cal/gr. Coal of Balikpapan Formation characterized by ash content 3.28 -5.21 % (adb), average 4.19 %, Sulphur content 0.11 -0.18 % (adb), average 0.15 % and Calorific Value 5245 -5665 cal/gr, 5540 cal/gr. Coal resources until 100 m depth and minimum thicknessof the coal seam 1,0 m is about 2,371 million tons, that consist of 1,743 million tons as hypothetical resources and 627.8 million tons as inferred resources. Coal deposits in this area have a big resources and clean quality but the problem is in transportation.

Teluk Sampit adalah tempat bermuaranya Sungai Mentaya yang merupakan akses menuju ke pelabuhan Sampit sebagai pelabuhan utama di propinsi Kalimantan Tengah. Masalah utama yang terjadi di alur pelayaran adalah sedimentasi yang cukup tinggi yang dibawa oleh daerah aliran sungai yang bermuara di Teluk Sampit. Proses sedimentasi dan pembentukan pantai yang terjadi di teluk Sampit sangat dipengaruhi sistem arus sungai, pasang surut dan energi gelombang, serta pasokan sedimen dari sungai-sungai. Hasil penelitian menunjukan bahwa sedimentasi yang paling tinggi terjadi di daerah barat bagian dalam teluk yang terlindung oleh spit Ujung Pandaran, dimana jenis pantainya berbakau. Di bagian timur proses sedimentasi relatif lebih kecil karena garis pantai terbuka terhadap Laut Jawa sehingga pengaruh energi gelombang dan pasang surut cukup tinggi. Endapan pantai ini berupa sedimen pasir yang mengindikasikan diendapkan pada lingkungan energi tinggi. Proses pembentukan Spit Ujung Pandaran murni oleh proses marin yaitu gelombang, pasang surut dan arus memanjang pantai, dimana pasokan sedimen dari hasil pelapukan dan abrasi Formasi Pembuang yang terletak di sebelah barat bagian luar. Spit ini sangat berpengaruh terhadap lebar mulut teluk dan pendangkalan di teluk. Morfologi permukaan dasar laut teluk Sampit menunjukan hal yang tidak lazim, dimana di bagian tengah ada lekukan yang memiliki kedalaman sampai dengan 18 meter, hal ini dapat ditafsirkan bahwa pernah dilakukan pengerukan di mulut teluk untuk keamanan navigasi. Untuk menjaga keamanan navigasi di teluk Sampit agar dapat dilayari maka harus dilakukan pengerukan secara berkala. Kata Kunci : sedimentasi, morfologi permukaan dasar laut, pengerukan, Teluk Sampit ABSTRACT Sampit Bay is the place of Mentaya estuary as an access to the main Sampit Harbour in the Central Kalimantan Province. The main problem for the access is high of sedimentation transported by many rivers into the Sampit Bay. Sedimentation process and beach forming in Sampit Bay are influenced by current river system, tide, wave energy and sedimentary supply from the rivers. From the field investigation indicate that high rate of sedimentation occur in western part of the inner bay, due to the bay is protected by Ujung Pandaran Spit, where mangrove is dominated in that beach. In the eastern part, the sedimentation rate is relatively small, because the coast line is open to the Java Sea, so that the influence of wave and tide energy is relatively high. This coastal deposit is represented by sand so that the sediment was deposited in