dinamika teluk jakarta – Widodo Pranowo

MAJALAH TEMPO 11-17 APRIL 2016
WWW.TEMPO.CO
ISSN: 0126-4273

LAPORAN UTAMA: REKLAMASI TELUK JAKARTA
Reporter: Amri Mahbub

Reklamasi akan membuat sirkulasi arus laut berkurang. Sedimen meningkat. Teluk Jakarta bisa menjadi comberan raksasa.

Perahu kayu milik Nuryadi, 47 tahun, melambat ketika mendekati Pulau G di Teluk Jakarta, Rabu pekan lalu. Dari kejauhan, daratan hasil reklamasi itu tampak seperti bukit pasir yang mengapung di permukaan laut. Di atasnya, lima mesin penggali hidrolik berwarna hijau muda sibuk menguruk.
Pulau buatan itu hanya berjarak sekitar tiga kilometer dari Kampung Nelayan Muara Angke, Jakarta Utara. Sejak pulau baru tumbuh, banyak nelayan mengeluh. “Cari rajungan dan ikan makin susah karena lautnya makin dangkal,” kata Nuryadi, nelayan sekaligus pemilik perahu yang Tempo tumpangi itu.
Karena terjadi pendangkalan, nelayan terpaksa melaut sejauh 30 kilometer ke Pulau Damar di Kabupaten Kepulauan Seribu. Itu pun tak ada jaminan nelayan bakal memperoleh ikan lebih banyak. Sedangkan risikonya hampir pasti: mesin kapal jadi cepat rusak lantaran kemasukan pasir yang terbawa arus.
Menurut Trisno, 22 tahun, anak buah Nuryadi, pendangkalan di dekat Pelabuhan Muara Angke mulai terasa dua tahun lalu. Kala itu, Pulau D, sekitar dua kilometer dari Pulau G, mulai dibangun. Trisno meyakini pendangkalan terjadi akibat pengurukan pasir di kedua pulau tersebut.

Widodo Setiyo Pranowo, peneliti senior dari Pusat Penelitian dan Pengembangan Sumber Daya Laut dan Pesisir Kementerian Kelautan dan Perikanan, mengatakan pindahnya habitat ikan akibat pendangkalan sudah diperkirakan jauh sebelum proyek reklamasi berjalan.
Read More Laut Diurug Sedimen Menumpuk

NEWS > NATIONAL

Corry Elyda – The Jakarta Post

Jakarta | Thu, October 8 2015 | 06:21 pm

A water management specialist from Dutch research institute Deltares has confirmed that the National Capital Integrated Coastal Development (NCICD) project, known as the Giant Sea Wall (GSW), will have an environmental impact, but says that land subsidence in Jakarta is a far greater threat and the wall is one of the solutions. Jan Jaap Brinkman said on Wednesday that the project might affect the Thousand Islands as well as erosion patterns, coral reefs and biota. However, Brinkman argued that the project was an urgent measure to protect four to five million people threatened by land subsidence that would see their current homes 4 to 9 meters below sea level. ‘Everybody keeps forgetting and ignoring the land subsidence, this is the driving force,’ he said.

Jakarta is sinking an average of 5 to 20 centimeters per year, with an average of about 7.5 cm per year. Brinkman added that if the land subsidence continued like this, by the end of the century Jakarta would have sunk another 5 to 6 meters. Brinkman said the ‘cheapest and easiest’ solution to land subsidence is to stop groundwater extraction. Millions of households, offices, and industries rely on groundwater as the coverage of tap water is only about 60 percent. ‘However, if the sinking does not stop, Jakarta has only two options to protect its people,’ he said. He went on to say that they comprised evacuating millions of people and buildings from northern Jakarta to higher ground or enclosing Jakarta Bay with a ‘good, very safe dike, good very large pumps and a very large lake to store the water: the giant sea wall’.

Recently, the Research and Development for Marine and Coastal Resources Department at the Maritime Affairs and Fisheries Ministry showed that the giant sea wall would have large environmental and social costs, including the disappearance of islands and the damage of biota in the sea. The ministry’s study claimed that it would also destroy the biota in the water inside the wall because of eutrophication process from the pollution of Jakarta’s 13 rivers, and displace thousands of fishermen. The study was conducted by more than a dozen researchers in 2014 by making a simulation of the GSW. The result was published as a book, Dinamika Teluk Jakarta; Analisis Prediksi Dampak Pembangunan Tanggul Laut Jakarta (The Dynamics of Jakarta Bay; Prediction Analysis of the effects of the Giant Sea Wall Construction), by IPB Press.

Tag: dinamika teluk jakarta

Laut Diurug Sedimen Menumpuk

Giant Sea Wall urgent to save sinking Jakarta: Consultant