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The Importance of Nutrients Concentration Monitoring In Coastal Area Wisnu Arya Gemilang; Ulung Jantama Wisha; Ruzana Dhiauddin
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 24, No 2 (2019): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.583 KB) | DOI: 10.14710/ik.ijms.24.2.69-80

Abstract

Land utilization changes of the natural resources conservation area of Pangandaran coastal area, that have been utilized as a marine tourism area, which affect many kinds of environmental degradation threats. Updating the condition of Pangandaran waters is essential due to its condition impacted by anthropogenic activities. Water condition monitoring was done by measuring nutrients as an indicator to assess the water fertility and pollution. Fourty five observation points were selected and divided into three locations, representing the condition of river, estuary/mangrove area, and open sea. Nutrients were analyzed by employing Standard Methods for The Examination of Water and Wastewater 22nd Edition 2012 (SMEWW). Currents and tides were measured for 15 days, used as the basis input of hydrodynamic model. The results showed that the highest of average value of nitrate was found in the estuary/mangrove forest which reached 0.998 mg.L-1. While, the highest phosphate content was observed in the river which reached 0.928 mg.L-1. The highest ammonia concentration was observed in the sea which reached 0.027 mg.L-1. N:P ratios in the study area are categorized <16, which showed that Pangandaran waters are in the condition of N-limitation. These conditions trigger blooming of phytoplankton due to the high concentration of nitrate. The higher nutrient concentration indicates that anthropogenic activities take place. Tidal current has an important role transporting nutrient in the estuary, triggering nutrient deposition and blooming tendency. Restrictions on residential areas and the utilization of coastal areas are an appropriate step to reduce the pollution level in Pangandaran waters.
UPAYA KONSERVASI KAPAL KARAM GOSONG NAMBI SEBAGAI BUKTI ADANYA JALUR PERDANGAN MARITIM MASA LALU DI KABUPATEN PESISIR SELATAN, SUMATRA BARAT Ulung Jantama Wisha; Nia Naelul Hasanah Ridwan; Ruzana Dhiauddin; Guntur Adhi Rahmawan; Gunardi Kusumah
AMERTA Vol. 38 No. 1 (2020)
Publisher : Pusat Penelitian Arkeologi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24832/amt.v38i1.63-76

Abstract

Abstract. Conservation Efforts of Gosong Nambi Shipwreck as an Evidence of the Past Maritime Trading Routes in Pesisir Selatan Regency, West Sumatra. The coastal region of West Sumatra has become one of the main trading routes in the 15th-19th centuries so there is no doubt that this area has many archaeological remains both underwater, coastal area, and buried underground. One of the underwater archaeological remains in this region is the discovery of a shipwreck at the Gosong Nambi coral site which is administratively located in Pesisir Selatan Regency, West Sumatra Province in 2015. This study aims to provide an overview of the current condition of the Gosong Nambi Shipwreck site. Research activities include collecting information, searching the shipwreck’s location, recording data, measuring the visible dimensions, and sketching the shipwreck, has been done. Visually, it is a small size vessel which was predicted as a cargo ship from the 1900s that might sail from Bengkulu to West Sumatra and crashed into Gosong Nambi coral (Atoll) and then sank. The shipwreck is partially buried in the sand and piles of the dead coral in the stern and most of the ship’s hull had been looted by scarp metal hunters. Natural factors also trigger site vulnerability so it is advisable to excavate. Conservation efforts are necessary to be done with a CRM approach which can have a positive impact on society on socio-economic aspects without harming any related parties. Abstrak. Wilayah pesisir Sumatra Barat menjadi salah satu jalur perdagangan utama pada abad ke-15-19 sehingga tidak diragukan lagi wilayah ini memiliki banyak tinggalan arkeologis baik yang di bawah air, wilayah pantai, maupun terkubur di bawah tanah. Salah satu tinggalan arkeologi bawah air di wilayah ini adalah temuan kapal karam di situs gugusan karang Gosong Nambi yang secara administratif terletak di Kabupaten Pesisir Selatan, Provinsi Sumatra Barat pada tahun 2015.Tujuan dari penelitian ini adalah untuk memberikan gambaran kondisi terkini situs kapal karam Gosong Nambi. Aktivitas penelitian berupa pengumpulan informasi, pencarian lokasi situs, perekaman data, pengukuran dimensi kapal yang terlihat, dan membuat sketsa kapal, telah dilakukan. Secara visual, kapal tersebut termasuk kapal kecil yang diprediksi sebagai kapal barang dari tahun 1900-an yang mungkin berlayar dari Bengkulu menuju ke Sumatra Barat dan menabrak gugusan karang (atol) Gosong Nambi dan akhirnya tenggelam. Kondisi kapal karam tersebut sebagian terkubur dalam pasir dan tumpukan karang mati pada bagian buritan dan sebagian besar lambung kapal telah dijarah oleh para pemburu besi tua. Faktor alam juga menjadi pemicu kerentanan situs sehingga disarankan untuk melakukan ekskavasi. Upaya konservasi perlu dilakukan dengan pendekatan CRM yang dapat terdampak positif terhadap masyarakat pada aspek sosial ekonomi tanpa merugikan berbagai pihak yang terkait.
Estimation of Sediment Distribution Based on Bathymetry Alteration (2014-2016) in the Inner Bay of Ambon, Maluku, Indonesia Guntur Adhi Rahmawan; Wisnu Arya Gemilang; Ulung Jantama Wisha; Ruzana Dhiauddin; Koko Ondara
Jurnal Segara Vol 15, No 2 (2019): Agustus
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1370.579 KB) | DOI: 10.15578/segara.v15i2.6956

Abstract

The development of Ambon city is centered around Ambon Bay. As the major area of marine and social activities, changes occurred directly affect to seawater degradation. Sedimentation is the main issue that has been occurring. Marine ecosystem can be potentially hampered by the high rate of sedimentation in the Inner Bay of Ambon (TAD). This study aimed to determine the distribution of sediment volume within the bay. Bathymetry of TAD was surveyed using transducer (Echosounder Echo track CVM Teledyne Odom Hydrographic Single Beam), which the depth of certain position was connected to GPS to record all the position data accurately. The field data are then analyzed spatially modelled in the form of 2D and 3D maps, overlaid with the past bathymetry data to calculate the bathymetry alteration and sediment volume estimation during 2014-2016. The depth of TAD in 2014 ranged between 0 - -42 meters, while, in 2016 the water depth slightly changed to 0 – -44 meters. The reduction of the water depth is observed in the 25 – 125 m from shoreline, where the bed thickness changes observed ranging from 0.1 - 1.4 m. Total volume of sediment augmentation reaches 13,236,182 m3 that covers about 67.67 Ha. Tidal current, that ranged averagely from 0-1.2 m/s, has a tremendous influence on sediment transport in TAD. The bay mouth, that is a semi-enclosed enclosed area, triggers sediment accumulation due to the weak tidal current transport. If ongoing, these conditions may endanger the environment and biota survival ability.