Risti Endriani Arhatin | Institut Pertanian Bogor (IPB) (original) (raw)

Papers by Risti Endriani Arhatin

IOP Conference Series: Earth and Environmental Science, 2018

We analyzed the percentage of valid coastal altimetry Jason-2 X-TRACK-SLA data by Center for Topo... more We analyzed the percentage of valid coastal altimetry Jason-2 X-TRACK-SLA data by Center for Topographic Studies in Sea and Hydrosphere (CTOH) and the waveforms from the Sensor Geophysical Data Record (SDGR) that are distributed by NOAA National Ocean Data Center around the Indonesian waters. In general, the percentage of valid data after the first point of the shoreline is greater than 90%. The percentage of valid data in steeper waters (86%) is higher than sloping waters (34%). The waveform types formed in coastal waters are peaky and Brown. However, spatially there is a difference where in a steep coast at a distance of > 5 km from the coastline the type of waveform is identified Brown, while on the sloping coast the brown type is found at a distance > 10 km. The SLA time series indicate seasonal variations in which the SLA is negative during the Southeast Monsoon (May-October) and positive during Northwest Monsoon (November-April).

IOP Conference Series: Earth and Environmental Science, 2021

This study examines the accuracy of the sea surface height anomaly (SSHA) altimetry data products... more This study examines the accuracy of the sea surface height anomaly (SSHA) altimetry data products of Copernicus, Colorado University (CU), and X-TRACK-Centre for Topographic studies of the Ocean and Hydrosphere (X-TRACk-CTOH). The SSHA derived from altimetry accuracy was tested by comparison with tide gauge (TG) observations. Taking measurements along the IMC coast demonstrates the excellent agreement between the SSHA derived from altimetry and the TG observations, with an average root mean square deviation (RMSD) as low as 10 cm and a strong correlation. The study’s findings revealed that the Copernicus data products could be used to monitor sea-level variability and trends in the IMC accurately. The 25-year time series data from SSHA demonstrated that the sea-level trend in the IMC is higher than the global trend.

Selection of wrong location fishponds will cause the problems, such as increasing the cost of con... more Selection of wrong location fishponds will cause the problems, such as increasing the cost of construction, operational, and may cause environmental degradation. The purpose of this study was to evaluate the land suitability for shrimp farms considering the coastal and river border planning maps in Kecamatan Cijulang and Parigi. This study uses the Geographic Information Systems (GIS) to determine the level of compliance of existing shrimp farms in the area. The parameters taken into calculated are: land use; soil texture; soil type; land slope; distance from the river; distance from the shore; water pH, and salinity. The result of the spatial analysis was added by limiting factor coastal and river border, so the extensive shrimp farms area is 23.8 ha divided into three classes of suitability, namely very accordance (11.7 ha or 49.0%); accordance (1.0 ha or 4.3%), and not in accordance (11.1 ha or 46.6%). There are no shrimp farms in the area of conditional suitability. The existing...

Kelangkaan data spasial kelautan merupakan permasalahan mendasar dalam perencanaan pembangunan ke... more Kelangkaan data spasial kelautan merupakan permasalahan mendasar dalam perencanaan pembangunan kelautan di negara berkembang seperti lndonesia. Untuk mengatasi permasalahan ini, teknologi inderaja menjadi salah-satu alternatif pilihan. Salah satu ekosistem laut yang mengandung kekayaan sumberdaya alam adalah ekosistem terumbu karang. Pemanfaatan data inderaja untuk pemetaan ekosistem terumbu karang telah diperkenalkan di lndonesia sejak tahun 90-an dan saat ini sudah umum digunakan di Indonesia. Namun demikian, data inderaja mempunyai keterbatasan untuk memetakan objek terumbu karang karena berada hingga kedalaman tertentu yang tidak ada penetrasi cahaya. Pola distribusi terumbu karang yang mengikuti geomorfologi dasar perairan sangat mempengaruhi hasil penginderaan. Hasil penelitian di kepulauan Una-una Togean menuniukkan bahwa interpretasi dari citra satelit tidak menggambarkan kondisi terumbu karang yang sesungguhnya. Kata Kunci: Data Spasial, Kelautan, Inderaja, Terumbu Karang ...

The existence of tuna fish is influenced by environmental factors, such as sea surface temperatur... more The existence of tuna fish is influenced by environmental factors, such as sea surface temperature and concentration of chlorophyll-a. Information of fishing season is essential in order to support the success of fishing activities. The Indian Ocean has potential resource of tuna fish, particularly bigeye and yellowfin. Most common way to catch tuna is by trolling. This study aimed 1) to describe fluctuation of tuna catch by trolling, 2) to map variability of sea surface temperature, and 3) to determine connection between tuna catch and sea surface temperature. The research was conducted in Indian Ocean Southern Coast of East Java. The data analyses were carried out through 1) analysis of fishing season index, 2) analysis to determine spatial and temporal distribution of sea surface temperature image 3) analysis of correlation between tuna catch and sea surface temperature. The result shows a pattern of tuna catch, which increasing in east season and decreasing in west season. Tuna ...

Optical system application in remote sensing data has good accuracy in inventory and monitoring o... more Optical system application in remote sensing data has good accuracy in inventory and monitoring of coastal land. The area that is always covered by clouds and cannot be detected using optical system is expected to be detected by the availability of the Radar system. In this study, we use Radar satellite image, which works on the C-channel. The purpose of this study are mangrove identification, filter selection and segmentation method selection of the Radar satellite data. The results are that the median filter (non-adaptive filter) is the best for mangrove identification or the gamma filter (adaptive filter). While, the best segmentation method is the median cut. Keywords: filter, mangrove, r adar satellite, segmentatio n

The land surface in DKI Jakarta Province is thought to have experienced relatively continuous sub... more The land surface in DKI Jakarta Province is thought to have experienced relatively continuous subsidence because of natural processes and man-made activities. This research was carried out to evaluate the rate of land subsidence in Jakarta Province. The data used in this study are two pairs of Sentinel-1A level 1 Single Looking Complex (SLC) images which were acquired in 2019 and 2020. The data was processed using the DInSAR method to examine the rate of land subsidence. The results show that the land subsidence rate in Jakarta Province during the 2019-2020 period varies from 1.8 cm to-10.7 cm/year. From 2019 to 2020, the average land subsidence in the City of North Jakarta is around-4.9 cm/year, East Jakarta is around-2.5 cm/year, West Jakarta is around-4.8 cm/year, Central Jakarta is around-3.1 cm/year, and South Jakarta about-2.8 cm/year. Land subsidence occurs mostly in coastal areas and near estuaries caused by the nature of alluvial deposition materials. It has caused damages to road infrastructure in several regions of Jakarta Province, such as Mutiara Beach, West Cengkareng, and Pademangan.

International Journal of Remote Sensing and Earth Sciences (IJReSES), 2014

Enhalus acoroides is the largest population of seagrasses in Indonesia. However, growth rate and... more Enhalus acoroides is the largest population of seagrasses in Indonesia. However, growth rate and productivity analyses of Enhalus acoroides and the use of satellite data to estimate its the productivity are still rare. The goal of the research was to analyze the growth rate, productivity rate,seasonal productivity of Enhalus acoroides in Pari island and its surroundings. The study was divided into two phases i.e., in situ measurments and satellite image processing. The field study was conducted to obtain the coverage percentage, density, growth rate, and productivity rate, while the satellite image processing was used to estimate the extent of seagrass. The study was conducted in August 2011 toJuly 2012 to accommodate all four seasons. Results showed that the highest growth rate andproductivity occurred during the transitional season from west Monsoon to the east Monsoon of 5.6cm/day and 15.75 mgC/day, respectively. While, the lowest growth rate and produc...

International Journal of Remote Sensing and Earth Sciences (IJReSES), Apr 11, 2014

IOP Conference Series: Earth and Environmental Science, 2020

We analyzed the distribution of Purse seine fishing vessels using fishing lamps derived from the ... more We analyzed the distribution of Purse seine fishing vessels using fishing lamps derived from the Day/Night Band Visible Infrared Imaging Radiometer Suite (DNB-VIIRS) sensor and Vessels Monitoring System (VMS) platform in the Java Sea. The data of fishing vessel distribution derived the DNB-VIIRS sensor and VMS platform was provided by NOAA Center for Environment Information and Global Fishing Watch respectively. The intensity of lights during the fishing operation was measured by a lux meter. The fishing vessel types that used light during fishing operations were small (< 15 units lamps) and large vessels (>15-unit lamps). The intensity of light in the big vessels (> 2,000 Lux) was higher than the small vessels (< 2,000 Lux). The average number of fishing vessels operating during the Southeast monsoon were more than those of the Northwest monsoon. The distribution of fishing vessels derived from the DNB-VIIRS sensor has a similar pattern with the VMS platform. Generally,...

The Egyptian Journal of Aquatic Research, 2018

The Indonesian Fisheries' Management of the Indian Ocean (FMA 573) has great tuna resources, espe... more The Indonesian Fisheries' Management of the Indian Ocean (FMA 573) has great tuna resources, especially yellowfin and bigeye. There are various problems regarding activities of tuna fisheries in this area, and now is the time to initiate an integrated management. This research aims to evaluate the biological and technological aspects of tuna fishing activities in the FMA 573, and to design a management model on resources and fishing technology aspects of Indonesian tuna fisheries in the Indian Ocean area (FMA 573). Model design was carried out using the soft system methodology approach. The study resulted in identifying three problems regarding resources and six problems regarding the technological aspect. Finally, the model design of tuna fisheries management in the Indian Ocean (FMA 573) gave a solution for regulating the number of fishing effort in the Indian Ocean (FMA 573) as well as for realigning the use of FADs with its technical and implementation guidelines. Lastly, the study aimed at helping in building a system which is capable of guaranteeing the national implementation on the certification of competence for ship captains and crew through policymaking and budget allocation. The conceptual model was constructed based on the definition of RDs.

Jurnal Kelautan Nasional, 2019

Kami menggunakan data harian sensor satelit Visible Infrared Imaging Radiometer Suite (VIIRS) Day... more Kami menggunakan data harian sensor satelit Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB) untuk pemetaan distribusi kapal-kapal ikan yang menggunakan cahaya untuk operasi penangkapan ikan selama periode 2015-2017 di Laut Jawa. Tujuan dari penelitian ini adalah untuk menganalisis perbedaan distribusi kapal-kapal ikan yang menggunakan cahaya untuk operasi penangkapan ikan antara fase bulan terang dan fase bulan gelap. Survei lapangan dilakukan untuk mengetahui jenis kapal ikan yang menggunakan cahaya lampu untuk operasi penangkapan ikan. Kami menganalisis perbedaan distribusi kapal penangkap ikan antara bulan terang dan bulan gelap di Laut Jawa. Hasil penelitian menunjukkan bahwa jumlah rata-rata kapal penangkap ikan menggunakan lampu untuk operasi penangkapan ikan di fase bulan terang badalah 230 unit sedangkan fase bulan gelap adalah 1.118 unit. Analisis statistik uji-t menunjukkan ada perbedaan yang signifikan secara statistik antara rata-rata jumlah kapal...

Jurnal Ilmu dan Teknologi Kelautan Tropis, 2016

Absorption coefficient measurement can be used in estimating water quality, optical characteristi... more Absorption coefficient measurement can be used in estimating water quality, optical characteristic of water column, and marine bio-optical models. The purposes of this research were to determine values and variability of sea surface absorption coefficient in the northeastern Gulf of Mexico (NEGOM) based on various seasons. The data were collected in spring, summer, and fall seasons in 1999-2000 with AC-9 instrument. The spatial distribution of absorption coefficient showed that relatively high values were generally found along the run off Missisippi, Mobile, Chochawati, Escambia, Apalachicola, and Suwannee rivers, as well as Tampa Bay. Meanwhile, relatively low values were found in offshore region. This pattern followed the distribution pattern of chlorophyll and CDOM. Based on the local region comparison of spectral average value of absorption coefficient, we found a significant difference (α = 95%) among regions with the highest value in the run off of the Mississippi and Mobile rivers, and the lowest value in the offshore region. Comparison of spectral average value of absorption coefficient among seasons at the three primary wavelengths (blue=440 nm, green=510 nm, and red=676 nm) also showed a significant difference (α = 95%) with the highest value during the summer 1999 (Su-99) and the lowest value during the spring of 2000 (Sp-00). Absorption coefficient values were influenced by oceanographic factors that varied in every season such as wind, surface currents, upwelling, the location and speed of the Loop Current, and the river discharge of fresh water into the NEGOM.

Jurnal Ilmu dan Teknologi Kelautan Tropis, 2013

Spectral measurements of remote sensing reflectance (R rs) of surface waters in the northeastern ... more Spectral measurements of remote sensing reflectance (R rs) of surface waters in the northeastern Gulf of Mexico were conducted in various seasons in 1999-2000 using Fieldspec Analytical Spectral Devices (ASD) Spectroradiometer. Filtering process was performed on the data to eliminate invalid data. In general, in coastal waters particularly near rivers mouth (water type-2) the R rs spectrals were relatively low at blue, maximum at green, and decreased to a minimum value at the red wavelength. In offshore waters (type-1), the general pattern of R rs spectrals were maximum at the blue wavelength and then continued to decline at the green wavelength until the minimum value at the red wavelength except during summer where R rs spectrals in most offshore area having the maximum value at the green wavelength due to the phytoplankton bloom as a result of freshwater intrusion from the Mississippi river. In general, the patterns and values of R rs were significantly different among seasons and locations. Results showed that R rs values at the blue wavelength (λ=400 nm) were generally higher in the spring than in other seasons ranging of 0.007-0.018 sr-1 in offshore waters and 0.004-0.015 sr-1 in coastal waters. During spring, Rrs values at the green wavelength (λ=500 nm) were also higher than in other seasons ranging of 0.005-0.013 sr-1 found in coastal waters. However, during summer in coastal waters, the maximum values of R rs spectrals were found in different green wavelength on different locations showed the differences in the type and composition of phytoplankton, organic materials, and suspension matters at those locations.

Jurnal Teknologi Perikanan dan Kelautan, 2017

Pemilihan lokasi tambak yang salah akan menimbulkan masalah, diantaranya adalah meningkatkan biay... more Pemilihan lokasi tambak yang salah akan menimbulkan masalah, diantaranya adalah meningkatkan biaya konstruksi, operasional, dan dapat menimbulkan masalah lingkungan. Tujuan penelitian ini adalah untuk mengevaluasi kesesuaian lahan tambak udang dengan mempertimbangkan perencanaan sempadan pantai dan sempadan sungai di Kecamatan Cijulang dan Parigi. Penelitian ini menggunakan Sistem Informasi Geografis (SIG) dalam menentukan tingkat kesesuaian lahan tambak yang ada di lokasi tersebut. Parameter yang diperhitungkan dan dianalisis adalah: penggunaan lahan; tekstur tanah; jenis tanah; kelerengan lahan; jarak dari sungai; jarak dari pantai; pH air; dan salinitas. Hasil analisis spasial<em> </em>tersebut kemudian ditambahkan faktor pembatas sempadan sungai dan pantai sehingga luas tambak udang seluruhnya yang sebesar 23,8 ha terbagi menjadi tiga kelas kesesuaian, yaitu sangat sesuai sebesar 11,7 ha (49,0%); sesuai sebesar 1,0 ha (4,3%); dan tidak sesuai sebesar 11,1 ha (46,6%)...