Jurnal Kelautan

18-28

Authors: Achmad Fachruddin Syah

Indonesia merupakan negara kepulauan yang mempunyai potensi sumberdaya alam pesisir dan lautan yang sangat besar. Potensi sumberdaya alam ini perlu dikelola dengan baik agar dapat dimanfaatkan secara optimal bagi kesejahteraan bangsa Indonesia dengan tetap memperhatikan dan melakukan usaha untuk menjaga kelestariannya. Pengelolaan sumberdaya alam pesisir dan lautan yang baik diperlukan metode dengan pendekatan multidisplin ilmu yang meliputi berbagai aspek, seperti aspek pemanfaatan sumberdaya, kelestarian lingkungan dan aspek sosial ekonomi masyarakat. Teknologi penginderaan jauh mempunyai kemampuan untuk mengindentifikasi serta melakukan monitoring terhadap perubahan sumberdaya alam dan lingkungan wilayah pesisir dan laut. Kata kunci : penginderaan jauh, pesisir dan lautan

36-40

Authors: Indah Wahyuni Abida

Penelitian ini bertujuan untuk mengetahui struktur komunitas dan kelimpahan fitoplankton dan faktor yang mempengaruhi di perairan muara sungai Porong Sidoarjo. Metode penelitian dilakukan dengan metode deskriptif yang bersifat ex post facto. Analisis sampel air dilakukan di Laboratorium Tanah dan Laboratorium Ilmu Kelautan Universitas Trunojoyo. Dari hasil penelitian menunjukkan bahwa Struktur komunitas fitoplankton yang ada di perairan muara Sungai Porong terdapat 2 kelas yaitu Bacillariophyceae (14 genera) dan Dinophyceae (2 genera) dengan kelimpahan berkisar antara 18.077 sel/L - 29.305 sel/L. Indeks Keanekaragaman menunjukkan kestabilan populasi rendah dengan indeks keseragaman yang rendah sehingga tidak ada dominansi species. Faktor yang mempengaruhi kelimpahan fitoplankton adalah tingkat kecerahan perairan yang rendah akibat tingginya bahan tersuspensi. Kata Kunci : Struktur Komunitas, Fitoplankton, Muara Sungai Porong

48-53

Authors: Zainul Hidayah

In order to assess the extent of the decline of mangrove ecosystems, extensive mapping and monitoring programs are needed. To monitor the change in large-scale coverage of mangrove areas over certain periods of time, remote sensing technology offers many advantages compared to conventional field monitoring. The main benefit of using remote sensing is related to its speed and continuity in collecting space images of a broad area of the Earth’s surface. With the specific application on mangrove studies, remote sensing enables spatial and spectral information to be collected from the mangrove forests environment mostly located in inaccessible areas, where ground measurements become difficult and expensive. This review of the literature emphasizes the application of remote sensing in change detection and mapping of mangrove ecosystems. Key words : mangroves, remote sensing, mapping, field monitoring, continuity

66-69

Authors: Wahyu Andy Nugraha

This research was conducted on July to September 2009. Mangrove litterfall were trapped with 30 litter traps which were plotted under mangrove canopy 1.5 m above the ground, hence the traps were avoided from tide. In this research, we use Rhizopora mucronata, Rhizopora apiculata and Bruguera sp. 10 litter traps were used on each species. Litter traps were made from polyetilen with size of 1x1x0,5 m3. Mangrove litterfall were collected every two weeks for 3 months. The production rate of mangrove litterfall in Bangkalan were 4.08-18.38 g/tree/day. The fastest production rate of mangrove litterfall was found on Rhizopora mucronata with 64.56%, followed by Rhizopora apiculata and Brugueira sp with 24.32% and 11.12%, respectively. Key Words : mangrove litterfall, Bangkalan, Rhizopora

75-81

Authors: Firman Farid Muhsoni, Hartono, Sigit

Geographic Infiormation System modeling can be used to predict inundated area expansion that caused by mud flow. The alternative location of Lapindo mud flow can be identified from inundated area prediction. The aims of this research are 1) to appraise the accuracy of elevation data interpolation methods and IKONOS imagery accuracy in determinant variable retrieval, 2) to determine the alternative pond of Lapindo mud flow, 3) to evaluate volume capacity and to analyze the construction cost. The method of this research consist of determinant variable retrieval, these are: inundated zone, land use, public facilities and impacted area. Inundated zone map was retrieved from DEM interpolation result, the watershed modeling was done to get flow accumulation, flow direction and watershed, in order to get inundated zone. Land use map and public facilities were obtained from IKONOS imagery visual interpretation. Impacted area was determined according to President Regulation No. 14, 2007. Scoring, weighting and overlay of these four maps have been made to get mud flow alternative location. Weighting factors have been retrieved according to questioner result. The result of this research has shown that Kriging interpolation method was the best method for elevation data interpolation (RMSE = 1.3565). Land use interpretation accuracy achieves 93.5%. Public facilities interpretation accuracy achieves 100%. Nine candidates of mud exile alternative pond have been got as a research result. Alternative pond No.1 is the best pond, with 4.027 Ha area. Volume pond capacity achieves to 564.599.751 m3, with 3.704 days or 10 years endurance. Total cost of pond construction achieves Rp. 7.276.313.970.000. Keywords: site selection, watershed, mud, Lapindo.