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All Journal BULETIN OSEANOGRAFI MARINA Komunikasi Fisika Indonesia Jurnal Kelautan Tropis Jurnal Teknik Sipil
Kurniawan, Joko
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Distribution Pattern of Sand Dollar (Arachnoides placenta) in the Intertidal Ecosystem of Duta Coastal, Probolinggo Regency Setiawan, Rendy; Amalia, Rizqy; Fajariyah, Susantin; Kurniawan, Joko
Buletin Oseanografi Marina Vol 13, No 3 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i3.63314

Abstract

Species Arachnoides placenta can be found in tropical waters, one of which is in the intertidal ecosystem in Duta Coastal. Substrate types at Duta Coastal are dominated by sand and silt substrates and a small portion of muddy sand substrate. The various types of substrates at Duta Coastal are thought to be causing the population A. placenta choose a suitable habitat for their life, so that it can affect the pattern of distribution and density of A. placenta. This research aims to determine the distribution pattern and density of A. placenta in the intertidal ecosystem in Duta Coastal. This study used the method of systematic transect plots. Plots measuring 1x1 m were placed on the transects with a distance between plots of 10 meters. The number of plots laid was 332 plots. The results show the number of individuals A. placenta in the Duta Coastal intertidal ecosystem 828 individuals. The population of the A. placenta species in the Duta Coastal intertidal ecosystem is quite large because the type of substrate is suitable for the life of A. placenta Morisita Index value for the distribution pattern A. placenta is 9.3. Distribution pattern A. placenta in the Duta Beach intertidal ecosystem classified as aggregated and density values A. placenta in the intertidal ecosystem in Duta Coastal is 2.5 ind/m2. 
Species Diversity of Fiddler Crabs (Uca spp.) in the Mangrove Ecosystem of Duta Coastal, Probolinggo Regency, East Java Setiawan, Rendy; Anjani, Rifkah Ajeng; Fajariyah, Susantin; Cahyono, Haris; Kurniawan, Joko
Jurnal Kelautan Tropis Vol 28, No 1 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i1.24299

Abstract

Fiddler crab (Uca spp.) belongs to the Order Decapoda and Family Ocypodidae, which live by making burrows in the substrate between mangrove plants. The presence of fiddler crabs plays an important role in mangrove ecosystems, which can increase sediment mineralisation due to burrows that can increase oxygen distribution into the sediment. This research was conducted in the mangrove ecosystem of Duta coastal, Probolinggo Regency. The method used when sampling biota in this study is the transect-plot method, which is used to place 1x1 m2 plots systematically along the transect. Sampling of fiddler crabs was carried out at the lowest low tide. Samples taken were fiddler crabs in the plot. Data on the species found, the number of individuals of each species, and the total number of individuals obtained from species composition were used to calculate species diversity. Fiddler crabs (Uca spp.) found in the mangrove ecosystem Duta coastal were 10 species, namely U. perplexa, U. rosea, U. vocans, U. annulipes, U. triangularis, U. coarctata, U. tetragonon, U. vomeris, U. forcipata, and U. dussumieri. The diversity value of fiddler crab species in the Ambassador Coastal Mangrove ecosystem is moderate (Hˈ = 2.209). All species of fiddler crabs were found in the muddy sand substrate type, because the burrow structure is strong, so that when the tide, the burrow condition is maintained.
Interpretation of groundwater potential based on the Cooper Jacobs method combined with Schlumberger geoelectricity in Simpang Tiga Village, Pekanbaru City Kurniawan, Joko; Muhammad, Juandi
Indonesian Physics Communication Vol 22, No 1 (2025)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.22.1.57-60

Abstract

This study aims to analyze the aquifer parameter values including storativity, transmisivity, and hydraulic conductivity in Simpang Tiga Village, Pekanbaru City. This research is motivated by the community's increasing need for water due to higher population growth, and the Simpang Tiga Village which is close to the city center. Pumping test results using the Cooper Jacobs method showed an aquifer transmisivity value of 247.21 m2/day in the high category and a storativity value of 0.0845. The results of the geoelectrical test with the Schlumberger configuration obtained that the aquifer layer is in the fourth layer with a thickness of 11 m. The hydraulic conductivity obtained is 22.473 m/day and is included in the fast category.
Penilaian Kualitas Air Dari Mata Air Sebagai Sumber Air Baku Untuk Air Minum Di Kecamatan Singosari Kabupaten Malang Siswoyo, Hari; Haribowo, Riyanto; Prabandari, Ni Luh Putri; Permata, Veronika Yulia; Kurniawan, Joko
Jurnal Teknik Sipil Vol 20 No 2 (2024): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v20i2.6006

Abstract

Some residents in the Singosari District, Malang Regency use the potential of springs as raw water for drinking water. One of the main aspects that must be considered in exploiting the potential of springs is the feasibility of the quality of the water. The quality of the water used by residents is not necessarily identified. This research was carried out with the aim of providing an assessment of the feasibility of water quality from springs as a source of raw water for drinking water. The object of this research was 12 springs spread across the Singosari District. Physico-chemical parameters used as the basis for assessing water quality include pH, TDS, nitrate (NO3–), turbidity, iron (Fe), chloride (Cl–), manganese (Mn), sulfate (SO42–), ammonia (NH3), and sodium (Na+). The water quality from springs is assessed by using a water quality index model. The water quality index value of the springs studied has a range of 8.80 – 41.13. There are 10 springs with very good water quality category and 2 springs with good water quality category.
Co-Authors Amalia, Rizqy Anjani, Rifkah Ajeng Cahyono, Haris hari siswoyo Juandi Juandi Permata, Veronika Yulia Prabandari, Ni Luh Putri Rendy Setiawan Riyanto Haribowo Susantin Fajariyah