Indonesia as an archipelagic country has a high biodiversity of coral reefs but is very vulnerable to various threats, one of the causes of damage to coral reefs is by ship aground. The damage causes minor injuries to the degradation of the reef structure. The location of the grounding sometimes on the small islands with calm currents, but sometimes in straits with strong currents. However, the assessment must be carried out, so it is necessary to develop an approach to assessing that. The purpose of this study is to assess the damage of coral reefs, to quantify the extent of damage, and identify species of corals affected. The observation used ground truth (underwater photo transect), aerial photography, machine learning, and species distribution modeling. The results obtained from aerial photography show that the MV Pazifik has damage to coral reefs reaching 613.63 m2. Based on the coral genera distribution model, it was found 35–55 genera (control location), while at the ship aground, were found 3–5 genera. Therefore, the control location is a coral reef ecosystem that is dominated by corals, while at the ship aground it can be the habitat for several hard coral genera.
This study explored the use of participatory mapping and several machine learning algorithms (Naïve Bayes, GMO Maxent, SVM, CART, and Random Forest) to map climate induced landslide susceptibility in Lembeh Island, North Sulawesi, based on Earth Observation data available in Google Earth Engine. Participatory mapping on landslide incidents were conducted in three villages, i.e., Kareko, Pintu Kota, and Pasir Panjang. Data used include digital elevation model from SRTM, multispectral imageries from Sentinel 2, and precipitation from CHIRPS. Terrain modelling was done to DEM to come up with elevation, slope, curvature, and aspect. A cloud free mosaic of Sentinel Images was created using the median reducer and then NDVI was calculated. Precipitation data from CHIRPS was sampled and interpolated using kriging and reduced to maximum and mean. Each algorithm was trained using 70% participatory mapping data and then the prediction was tested for accuracy using the last 30%. Results showed that Random Forest, SVM, CART, and GMO Maxent gave 0.98 testing accuracy and Naïve Bayes only 0.90. The map showed that due to the terrain condition, Lembeh Island is prone to Landslide and even though previously BNPB already provide a landslide hazard risk map, there were many areas not included on that map. Therefore, the map could become an input for BNPB and the Bitung City for developing a mitigation and adaptation strategy. Machine learning and cloud computing along with participatory mapping could also complement mechanistic or multi-criteria analysis using GIS model for landslide susceptibility mapping.
Resilience is the ability of a system to reach equilibrium after a temporary disturbance. When an ecosystem is disturbed, then the recovery of the system is very dependent on the diversity of species that are still left. The remaining communities determine the direction of new successional communities formed after the disturbance has passed, including coral, fish, and other biota communities. This study aimed to determine the level of resilience of coral reef ecosystems on Lembeh Island. The observation was carried out from January 16-19, 2019, at a 7-meter depth. Determination of the coral reef index will refer to coral reef resilience index table. It is found that the resilience of coral reefs on Lembeh Island currently has a high potential for recovery (resilience) from natural stressors based on the 16 parameters. Seven parameters have very high resilience values: the proportion of bleaching resistant species, community resistance to bleaching, taxonomic diversity, size/age distribution, the abundance of reef fish on live coral, and the abundance of coral benthos on live coral and coral disease levels. Lembeh Island is dominated by hard corals measuring between 5.1 to 25 cm (size M) by ~46%, then sizes more than 25 cm (size L) by ~37% and juvenile size (size S) by 17%. The coral health index on Lembeh Island has the capacity to recover if the condition of coral cover is minimally maintained or improved and lower fleshy seaweed cover by increasing the abundance and biomass of herbivorous fish.
Belitung has potential coral reefs as many as 244 species and 89 species of reef fish. However, the current condition of coral reefs in Belitung is under high pressure, caused by illegal tin mining activities. For this reason, need studies related to their impact on the health of marine life, especially on coral reefs so that the policy can be reviewed, to see the important role of coral reefs for other marine biotas. The aim of this study is focused on knowing the condition of substrate coverage, diversity, and biomass of target fish as well as assessing the health of coral reefs at the observation site. Data were collected with SCUBA diving equipment at 6 stations, at depth of 5–1 m. Retrieval of basic substrate data is done by the Underwater Photo Transect method and for reef fish using belt transect. The results showed substrate coverage was dominated by hard corals, dead corals, sand, and dead corals with algae. Fleshy seaweed cover ranges from 0.07–4.77%, coral fragment cover ranges from 0–2.6%, target fish biomass value obtained varies between 0.0006–0.0299 kg/ha, and coral reef health index at each observation station ranges from 3 to 6.
Rote Ndao waters are known as a source of diversity of coral reefs in TNP Laut Sawu. Coral reefs in the area suffered considerable damage due to human activities. This study aims to determine the latest health conditions of the coral reef area in the northern region of Rote Island. Data monitoring was carried out using the underwater photo transect (UPT) method at 12 stations in the north of Rote Island. The percentage of coral reef bottom substrate cover was obtained by processing photo data using the Coral Point Count with Excel Extension-CPCe application. In addition, an assessment of the benthic component was also carried out based on the categories of percentage cover of fleshy seaweed, cover of rubble and hard coral. The results show condition of coral reefs based on percent cover is in the low category with a hard coral (HC) value of 9.02 ± 7.16%. The highest average value of hard coral cover was found at the Tesabela station. The three highest mean values for the bottom substrate cover type at the observation sites were dead coral with algae (DCA) 32.91 ± 19.5%; Algae assemblage (FS) 17.50 ± 19.27% and Sand (S) 17.43 ± 8.91%. The health condition of coral reefs based on the benthic component shows that the coral reef ecosystem is in a damaged condition and it is difficult to recover if it is disturbed. Necessary to carry out good and efficient management in the future, namely by reducing human activities without causing damage to coral reefs and finding ways for the community to continue to benefit economically from coral reef areas in the Sewu Marine National Park.
Optical device is a telecommunications device that uses glass or plastic media made from silica and SiO 2 to transmit data using light or LED (Light Emitter Diode) as the data is transmitted. Silica is one of the materials / media that serves as the transmission of data on the component microring resonator. This paper, investigate about the characteristic of microring resonator and specifically about the temperature effect on the cascaded parallel microring resonator. In this paper, also explains the resistance of the microring resonator for the various temperatures are given. How big is the change in the wavelength shift is happening and how the resulting output of wavelength. A cascaded parallel microring resonator is simulated using MatLab to analyze the temperature effect on the ring resonator components. This simulation also uses the couple mode theory to get the value of coupling coefficient. The wavelength used in this simulation was C-Band between 1530-1565 μm. The simulations result shows the resistance of the components cascade-parallel microring resonator for a certain temperature. The simulated temperature are varied between 28 o Celcius to 500 o Celsius. Based on the simulation result it can be concluded that the change in temperature will change the resonance wavelength. As the temperature is increased, the resonance wavelength shifts (The increased temperature will affect to the shifting of resonance wavelength). The results of this study, a temperature parameters are given to the resilience of the microring resonator.
Coral reefs are distributed widely around Indonesia waters which has various functions as fisheries sources and tourism benefits. Coral reefs are very vulnerable to various threats, such as ship grounding in several areas in Indonesia. The measurement of damage width of coral reefs used the irregular polygon method. In contrast, the impact and the level of damage were measured using the underwater photo transect (UPT) method. The grounding of the ship has caused massive damage to coral reefs with a width area of 46.89 m2. Types of damage include physical and biological damages that make the coral split, break, and shift. The ship grounding caused the coral colonies to be uprooted and blown from the substrate, destroying coral skeletons, lifting, and sediment displacement. Coral condition at the control area was 35.13% (bad condition), whereas condition on the damaged area as the impact of ship grounding was 14% in trajectory zone. The total width to be claimed was 11.92 m2. The degradation of coral reefs can affect and reduce the functions and benefits of ecosystems both ecologically and economically. The shipowner has to do the rehabilitation and compensation of the damaged area.
The purpose of this research is to see how far the contribution of learning Al-Qur'an tahsin is to the reading of the jama'ah (children) of the tahsin program participants. Then improve the quality of Al-Qur'an reading jama'ah (children) tahsin program participants. Then make the tahsin Al-Qur'an participants able to memorize the Al-Qur'an. This goal originated from the problem of the jama'ah (children) of the tahsin participants, who had difficulty reading and understanding the Al-Qur'an. Because of this, they were increasingly lazy and away from the Al-Qur'an. The author here uses the PAR (Participatory Action Research) method, which is an approach that wants to empower the congregation by starting from the problems and needs of the jama'ah (children). According to the researcher, this method is the most suitable for the jama'ah (children) condition. The results of this study are author saw changes in reading the Qur'an in the jama'ah (anak-anak) with the tahsin Al-Qur'an program. This change can be seen from the jama'ah (anak-anak) of the tahsin participants who can read the Qur'an properly and correctly. Overall the Al-Quran tahsin activities went well. The smooth implementation of the activity indicated this. There was a significant change in the reading of the congregation (children) in reading the Qur'an, which made this activity a success and received a good response from the community. It is hoped that research like this will be carried out by educational observers and will serve as a reference for future researchers.
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