Karakteristik Kawasan Pesisir Pantai Cilamaya (Teluk Blanakan dan Teluk Ciasem), Kabupaten Subang, Propinsi Jawa Barat

Kawasan pesisir utara Pulau Jawa merupakan kawasan yang sering mengalami perubahan akibat proses hidrometeorologi termasuk pesisir Cilamaya. Paling tidak ada 4 sungai yang mengalir bermuara antara lain Citarum (lama), Blanakan, Cilamaya dan Ciasem. Secara geomorfologi relatif datar yang tersusun dari proses proses fluvial dan proses asal laut sebagai endapan dataran banjir, endapan alur sungai, endapan estuari dan endapan laut. Endapan limpah banjir tersusun oleh lempung lanauan dan lempung kadang dijumpai adanya kerakal dan brangkal, dimanfaatkan oleh masyarakat sebagai Sawah, tanaman padi. Pasir, karekal dan berangkal merupakan material penyusun endapan alur sungai. Estuari terdiri dari material organik dan lempung. Daerah ini tertutup oleh hutan mangrove dan tambak. Endapan laut didominasi endapan yang berukuran halus lempung dan pasir (halus – kasar) dengan dibeberapa tempat kadang dijumpai pecahan cangkang.Kata kunci: Cilamaya, Kawasan Pesisir, estuariCoastal area in the northern of Java island is part of the always changes caused by hidrometeorogy aspect include the Cilamaya costal area. At least there are four river flow are (old) Citarum, Blanakan, Cilamaya and Ci Asem river. Geomorphologically the relief ralatively flat from the fluvial and marine proccesses, as floodplain, river (channel), estuaries (wet land), marine deposits. The floodplain deposits consists of silty clay and clay some time with pebble, use for the paddy field and some urban area. Sand, pebble and coble are from the river (channel). Estuary consists of organic material and clay, very weak. In the estuary cover by mangrove forest and fish pond. The marine deposits dominantly clay and sand (fine to coarse) with some place found broken shell. The hazards relation with the condition should be mitigate are subsidance, flood from the river and tide (rob).Keyword: Cilamaya, coastal area, estuaries

Quantification of fluvial-peat interactions in the Pikeville formation Central Appalachian Basin, USA.

<p>Basin-scale fluvial architecture is, to a large extent, determined by the ability of river systems to migrate and avulse across their own floodplain. River avulsion takes place when a river aggrades by one channel depth to achieve super-elevation above the surrounding floodplain. However, peat enhancement of floodplain aggradation is likely to affect this fluvial behaviour and has received little attention. The interaction between river channels and peat-dominated floodplains is likely to have the effect of inhibiting or prolonging the conditions required for river avulsion, and so will impact on basin scale architecture during prolonged peat accumulation on floodplains. To elucidate and quantify the nature of this channel-floodplain interaction we investigate the coal-bearing clastic interval of the Carboniferous Pikeville Formation, Central Appalachian Basin, USA. Using a combination of well data and outcrop data, two coal horizons and intervening sand bodies, were mapped across an area of 5700 km<sup>2</sup> to ascertain overall basin-scale architecture. Comparison of the accumulation rate of the coal units (corrected for decompaction) with the synchronously deposited sand bodies suggests that extensive and rapid peat accumulation can increase avulsion timescales by 3 orders of magnitude and dramatically alter basin-scale fluvial architecture.</p>