Island Beach Research Articles

DAYA TARIK WISATA DAN DAYA DUKUNG KAWASAN WISATA DI TAMAN WISATA ALAM PULAU POMBO MALUKU TENGAH

This research aims to determine the tourist objects and attractions in the Pombo Island Nature Tourism Park and also the carrying capacity of the Pombo Island tourist area. This research is a qualitative and quantitative descriptive research in the form of written words and analysis of tourist objects and attractions. The research results showed that there were 17 types of plants including seedlings, saplings, poles and trees. There are 23 types of birds found, there are also nesting habitats for gosard birds and hawksbill turtles which can be a tourist attraction. The calculation of the ecotourism carrying capacity index in the Pombo Island area has a value of 73.80%, indicating that the Pombo Island beach is "very suitable" to be used as an area for beach ecotourism. The PCC value of 1,044 means that the Pombo Island TWA area can accommodate 1,044 tourists/day.

Abundance and distribution of anthropogenic marine litter on the beaches of Sonadia Island: An Ecologically Critical Area

Plastic is one of the most common types of anthropogenic marine litter (AML) found in the world's oceans. Plastic entry into marine ecosystems poses a significant threat to marine ecology. Its ubiquitous prevalence creates serious environmental concerns. To address this issue, a comprehensive survey was conducted on the seven beaches of Sonadia Island, designated as an ecologically critical area of Bangladesh. The research aimed to investigate the abundance and distribution of AML and assess environmental health using four indices. A total of 14809 AML items were collected, yielding an average density of 0.71 items/m². The most abundant AML types were plastic (76.41 %), with a mean density of 0.49 items/m². Fishing and recreational activities are identified as the primary sources of AML on Sonadia Island. The Clean Coast Index revealed that two beaches had ‘moderate cleanliness’, four were ‘dirty’, and one was ‘extremely dirty’. The Plastic Abundance Index indicated ‘moderate abundance’ with a mean value of 2.97. Furthermore, the Hazardous Item Index classified four beaches under ‘class II’, and three were ‘class III’. Additionally, the Pollution Load Index calculated at 21.34 signifies a ‘hazard level III’, denoting high contamination with AML. The results indicate that Sonadia Island's beaches are heavily polluted with AML, particularly plastic, causing significant harm to the local flora and fauna. The research emphasizes the importance of raising awareness about the harmful effects of AML on marine biodiversity. To address this issue, Governments, private organizations, plastic producers and the local community must adopt sustainable waste management practices.

Biogeographic effects shape soil bacterial communities across intertidal zones on island beaches through regulating soil properties

Island coastal zones are often mistakenly perceived as “ecological desert”. Actually, they harbour unique communities of organisms. The biodiversity on islands is primarily influenced by the effects of area and isolation (distance from the mainland), which mainly focused on plants and animals, encompassing studies of entire islands. However, the application of area and isolation effects to soil microorganisms on island beaches across the intertidal zones remains largely unexplored. We hypothesized that island area and isolation shape soil bacterial communities by regulating soil properties on island beaches, due to the fact that local soil properties might be strongly influenced by land-use, which may vary among islands of different sizes and isolations. To test this hypothesis, we conducted a study on 108 plots spanning 4 intertidal zones on 9 representative island beaches within Zhoushan Archipelago, eastern China. We employed one-way ANOVA and Tukey's honestly significant difference (HSD) test to assess the differences in diversity, composition of soil bacterial communities and soil properties among intertidal zones. Redundancy analysis and structural equation modelling (SEM) were used to examine the direct and indirect impacts of beach area and isolation on soil bacterial communities. Our findings revealed that the area and isolation did not significantly influence soil bacterial diversity and the relative abundance of dominant soil bacterial phyla. However, soil nitrogen (soil N), phosphorus (soil P), organic carbon (SOC), available potassium content (soil AK), and electrical conductivity (soil EC) showed significant increases with the area and isolation. As the tidal gradient increased on beaches, soil bacterial OTU richness, Chao 1, and relative abundance of Planctomycetota and Crenarchaeota decreased, while relative abundance of other soil bacterial phyla increased. We found that influences of island area and isolation shape soil bacterial communities on beaches by regulating soil properties, particularly soil moisture, salinity, and nutrients, all of which are also influenced by area and isolation. Island with larger areas and in lower intertidal zones, characterized by higher soil water content (SWC), soil EC, and soil AK, exhibited greater soil bacterial diversity and fewer dominant soil bacterial phyla. Conversely, in the higher intertidal zones with vegetation containing higher soil N and SOC, lower soil bacterial diversity and more dominant soil bacterial phyla were observed. These findings have the potential to enhance our new understanding of how island biogeography in interpreting island biome patterns.

Variations in macrofaunal communities along sand physico-chemical gradient across the intertidal zones on island beaches

Island beaches, once mistakenly considered as 'ecological deserts', are actually unique ecosystems that support abundant macrofaunal communities. However, limited studies have examined the variations and determinants of macrofaunal communities across the intertidal zones on island beaches, which is crucial for shedding light on the underlying ecological processes and enhancing biodiversity conservation efforts. Here, we explored the variations in macrofaunal communities along sand physico-chemical gradient across four intertidal zones on nine representative beaches, within the largest land-bridge archipelago in eastern China. Our findings revealed that species richness, density, and Shannon-Wiener diversity of macrofaunal communities were notably higher in the lower intertidal zones, exhibiting a positive correlation with elevated levels of sand moisture (M), electrical conductivity (EC), available potassium (AK), and grain size (GS). Conversely, macrofaunal Simpson diversity displayed an inverse pattern, with heightened values observed in the vegetation zone. The Saprophagous, Predaceous, and Omnivorous groups of macrofaunal communities demonstrated an increase with higher levels of EC, AK, and M in the lower intertidal zones. Furthermore, Phytophagous group of macrofaunal communities tended to inhabit the vegetation zones characterized by elevated levels of sand total phosphorus (TP), total nitrogen (TN), and organic carbon (OC). Primarily, our findings indicate that sand nutrition, moisture, and salinity play pivotal roles in shaping the variations of macrofaunal communities on island beaches. These insights offer valuable perspectives into the holistic responses of macrofauna on island beaches to changes in sand physico-chemical properties, serving as a crucial theoretical foundation for the assessment, conservation, and restoration of island beaches.

Understanding the sources of marine litter in remote islands: The Galapagos islands as a case study

Determining the sources of marine litter is necessary to mitigate this increasing global problem. Plastic bottles are useful tracers of marine litter and constitute the main item (24%) stranding on remote beaches in the Galapagos Islands. The aim of this study was to estimate the abundance of plastic bottles in remote beaches and inferred their sources. To do so, we collected plastic bottles at 60 remote Galapagos Island beaches from 2018 to 2022. 76% of beaches were qualified as badly polluted, with >34 bottles·100 m−1. Most identified bottles came from Peru (71%), followed by China (17%) and Ecuador (9%). Although most locally-sold products are made in Ecuador, they contribute little to beach litter loads. Polyethylene terephthalate bottles with lid (necessary for litter dispersal) represented 88% of all bottles, demonstrating that most of the litter reaching the Galapagos comes from distant sources, mainly from South America. However, bottle ages indicate that at least 10% of Peruvian, 26% of Ecuadorian, and all Chinese bottles likely were dumped from ships. Reducing marine litter reaching the Galapagos Islands requires tackling litter leakage from land-based sources in South America and better compliance with regulations banning the dumping of plastics and other persistent wastes from ships.

Sphingomicrobium clamense sp. nov., Isolated from Sediment of Clam Island Beach in China.

A Gram-stain-negative, non-flagellated, aerobic, ovoid or rod-shaped bacterium with motility, designated B8T, was isolated from the sediment of Clam Island beach, Liaoning province, China. The optimum growth of strain B8T occurred at 35 oC, pH 7.0, and in the presence of 4.0-5.0% (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain B8T formed a distinct lineage within the genus Sphingomicrobium and was closely related to Sphingomicrobium nitratireducens O-35T (98.3% sequence similarity), Sphingomicrobium aestuariivivum KCTC 42286T (96.9%), and Sphingomicrobium astaxanthinifaciens JCM 18551T (96.5%). The digital DNA-DNA hybridization and average nucleotide identity values between strain B8T and closely related strains were lower than 21.0% and 78.0%, much lower than the cutoff values of 70.0% and 95.0%, respectively, for bacterial species delineation. The dominant respiratory quinone of strain B8T was ubiquinone-10. The major fatty acids were Sum In Feature 8 (C18:1ω7c and/or C18:1ω6c), Sum In Feature 3 (C16 : 1ω7c and/or C16 : 1ω6c), C17:1ω6c, C18:1 2-OH, and C16:0. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, sphingoglycolipid, glycolipids, and four unknown polar lipids. The DNA G + C content of strain B8T was 63.9%. Based on the phenotypic, phylogenetic, and chemotaxonomic analyses, strain B8T is considered a new species of Sphingomicrobium, for which the name Sphingomicrobium clamense sp. nov. is proposed. The type strain is B8T (= CGMCC 1.19486T = KCTC 92052T).

A ladder of sense of place: Case study of Crow Island Beach Park, Sri Lanka

There is a growing interest in the field of sense of place research due to its influence on community participation. However, this area faces primary limitations characterized by terminological and conceptual ambiguity and challenges related to empirical operationalization. This paper aims to explore the dynamics of sense of place among the members of Crow Island Beach Park Management Society (BPMS), Sri Lanka. This study adopts a case study research design and through purposive snowball sampling 16 individuals were selected for interviews. Several recurring themes emerged when analyzing the interview-derived data, forming a conceptual progression resembling a ladder. The findings of this study reveal distinct stages of progression from placelessness, connected, committed, commend the place is best and consecrate the place over personal aspirations. The themes contributed to the development of ‘a ladder of sense of place’. This novel conceptual framework broadens existing notions of sense of place and introduces new dimensions to measurement scales. It can serve as a valuable tool for urban designers, planners, landscape architects and policymakers, enabling them to conduct qualitative assessments of individuals' sense of place on a local level. Moreover, it facilitates community participation in place-making and environmental management.

Edutourism Initiative in Pulau Santen Beach, Banyuwangi Through Local Community Empowerment by Sea Turtle Conservation Program

The potential of Santen Island beach, which has been known as a tourist beach, is increasingly visible with the amount of infrastructure and tourism built by the local government. This is done as an effort to promote Santen Island, as one of the best natural tourism centers in Banyuwangi. The people of Santen Island must be prepared as a group that is aware of the potential of their village and the sustainability of its natural tourism. Santen Island is also a tourist location that is annually used as a nesting site for sea turtles that land on the coast of Banyuwangi. This is actually very contrary to the natural habits of sea turtles which prefer to make nests in quiet places without the disturbance of sound, light, and humans. Because this natural nesting site is a tourist attraction, the local residents should also be given insights related to the protection of sea turtles that land on the coast of Santen Island as wildlife protected by the Conservation Law in Indonesia. This community service aims to strengthen the awareness and knowledge of the Santen Island tourism awareness group related to the importance of the role of the community around the beach to participate in preserving wildlife and their ecosystems. The methods used to carry out community service are lectures, discussions, and brainstorming. The location of the implementation is on the beach of Pulau Santen with the target group of people in the Pulan Santen beach area. The locality development model is applied in community service activities. The understanding, awareness, and participation of the target group increased. Through the community service activities that have been carried out, the sustainability of the program is needed until a conservation education tourism model is formed that has the potential to improve the economy of the surrounding community and the preservation of biodiversity in the region. This activity provides an increase in knowledge, awareness, and participation of the target group in managing the conservation of wildlife and their ecosystems, especially sea turtles.

Komposisi dan Kepadatan Sampah Laut (Marine Debris) di Pulau Misool: Studi Kasus Pantai Salafen dan Waigama

Marine debris is widespread in oceans around the world, including in the most remote locations. Here, we report on the accumulation of macro debris on the Misool Island beach, an island 192 km away from the mainland of Sorong. The aim of the research is to examine compositions, densities, and accumulation rates of marine debris in two locations, namely Salafen and Waigama beaches at April-Mei 2023. A total of 125 marine debris was collected during the survey that was carried out on two beaches with a total of 1498 grams. The mean of densities marine debris is 0.12 ± 0.05 items/m2 and 1.49 ± 0.85 gr/m2 based on the weight. As much as 93% of the debris was marine debris categories plastics, followed by metals (3%), glass, and rubber as much as 2% respectively from a total of debris. The mean of debris accumulation rates showed the highest debris accumulations were found in Salafen beach (39.9 gr/days) than in Waigama beach (31.4 gr/days). Long-term monitoring is most important for more understanding of the path and temporal changes for the management of marine debris in the future.

Environmental variables and its association with faecal coliform at Madh Island beaches of megacity Mumbai, India

The abundance of fecal-indicating bacteria in water bodies are said to be influenced by environmental conditions. The effect of environmental parameters on the changing microbial population plays an important role in coastal water quality assessment. It's crucial to comprehend these patterns in order to support management initiatives for pollution control. There are studies on faecal bacteria contamination of surface water and how environmental conditions affect it, however majority of them are based on large river basins and temperate regions of developed countries. In this paper, we study the different physicochemical and physical factors of the five recreational beaches in Mumbai, India and examine how these environmental factors affect the levels of faecal indicating bacteria, namely, coliforms in the region. A relatively high number of coliform was identified from the water and sediment samples of Marve Beach (>1600 MP N/100 ml or g), followed by Erangal Beach and Danapani Beach (∼150–350 MP N/100 ml or g), exceeding the normal standard limits of <100 MP N/100 ml set by the Central Pollution Control Board (CPCB) of India. Of the physiochemical parameters examined, BOD showed to have a strong positive correlation with the coliform bacteria. The nutrients and heavy metal concentrations did not show any major effect on the microbial population. The MIKE CMAP predicted tide, MIKE3 Flow Model FM simulated coastal current, ERA5 hourly wind, as well as SWAN model simulated nearshore wave together considerably exhibit alliance of microbial behavior in the beaches with ambient physical processes. This study reveals that Mumbai's coastal water contain significant concentrations of faecal bacteria, which, if not monitored regularly could have future consequences on the recreational activities of the region, thereby on public health. This assessment might help in simulation of water quality prediction, and for optimizing the coastal zone management and development across recreational beaches.

Edwardsiella tarda Isolated from a Kidney Mass in a Common Loon Gavia immer.

A Common Loon (Gavia immer) was found recumbent at Island Beach State Park, New Jersey, US, and euthanized. Necropsy revealed a caseous mass in the kidney, from which bacteria were isolated and phenotypically and molecularly identified as Edwardsiella tarda.

Spatio-Temporal Dynamics of Sediment Transport Pathways: Sand Apron Bars and Islands of Tokelau and Kiribati, Central Pacific

Although there is general agreement that global change will influence low-lying atoll islands, considerable uncertainty remains concerning the nature, rates, and causes of morphological change (or, conversely, the stability) of islands. As the net geomorphical product of sediment erosion, transport, and accumulation, islands are intimately tied to reef flat sedimentological processes. Recognizing the morphodynamical linkages between reef flats and islands, the purpose of this study is to examine the nature and controls on spatial and temporal variations in sediment transport pathways on reef flats and their relation to island planform changes or stability on atolls of Tokelau and Kiribati. GIS analysis of historical aerial images and high-resolution remote-sensing data capture patterns of reef flat change up to 72 years in duration with up to weekly temporal resolution. Data reveal how granular materials that make up bars and islands on reef flats respond to physical oceanographic processes via sedimentary-geomorphical change across temporal scales, from “instantaneous” impacts of cyclones or swell events to seasonal to multi-decadal shifts. Each of these shifts is manifest as migration of sediment of island beaches and bar forms, but the character varies markedly—bars form new islands, others erode and disappear; some changes are cyclic, others are directional, still others are hybrid; sediment can be transported lagoonward, oceanward, along the reef flat, or in combinations thereof; and migration rates reach up to 10 s of m/month. Although sea-level change likely plays a modulating role, much of the considerable spatial and temporal variability relates to differences in energy controlled by seasonal change in swell direction and climate shifts. Nonetheless, sedimentary response to these external forcings at any specific location also is shaped by local factors, such as trade wind-generated lagoonal waves and currents, atoll lagoon size and depth, margin width and orientation relative to waves, and autogenic processes such as attachment of migrating bars. Collectively, these influences shape the spatially and temporally heterogeneous sediment flux to and from islands, and thus the variable response of islands to ongoing sea-level change. Understanding such local influences is requisite to predictive understanding of how global change might impact these sensitive seascapes.

Perception and Awareness of Marine Plastic Pollution in Selected Tourism Beaches of Barobo, Surigao del Sur, Philippines

Tourism is a significant economic activity in coastal communities, but when badly managed, it degrades the health of the marine-coastal ecosystem, increasing litter pollution and repels beach visitors. This study aims to assess the tourism impact on litter pollution on four growing tourism beaches of Barobo, Surigao del Sur, Philippines. Plastic litters were sampled from four tourism sites (Cabgan Island, Turtle Island, Dapdap Beach, Panaraga Beach) of Barobo by establishing transect lines with quadrats. Those who agreed to participate in perception and knowledge tests about marine debris were interviewed at the aforementioned beaches. Respondents was generally aware of marine pollution problems, specifically marine pollution relating to human and ecological health. Respondents identified tourism as a main litter source and plastic packaging as the most common litter type, which is true based on macrolitter collection. Because tourism causes plastic pollution on all of the beaches studied, stronger regulations, educational, and awareness efforts are crucial to reduce litter pollution and avert ecological and socioeconomic consequences.&#x0D; Structured Abstract: Purpose: Tourism plays a big role in the economic status of a country. It provides livelihood to the community and helps in poverty elevation. But tourism also brings pollution, i.e., plastic pollution, if not properly managed. The primary objective of this study is to evaluate the perception and awareness of tourists on plastic pollution and its impacts on tourism. &#x0D; Design/methodology/approach: The study was limited to surveys and key informant interviews (KII) since fora and assemblies are not allowed due to pandemic health protocols. Survey sampling was done simultaneously with the macroplastic collection from July 10 to August 12, 2021. Convenience sampling design was used, and data was collected on willing individuals present in the area. The awareness questionnaire used the Likert Scale method, while the individual perception used multiple choice or open-ended questions. Statistical data analysis was performed using SPSS and Microsoft excel.&#x0D; Findings: A total of 105 willing individuals were legally part of this study. Of the 105 respondents surveyed, 70 of which are tourists from island beaches and 35 are from mainland beaches. Respondents were generally aware of most issues presented to them. The top issues that the respondents relate the most are related to plastic effects on health and environment. The majority of the surveyed tourists on island beaches perceived high macrolitter pollution, while those on mainland beaches perceived low pollution. This perception of respondents agrees with the litter quantities registered and collected. Furthermore, the perception of plastic packaging as the most common type of litter has been found out to be true based on sampling collections. Tourists on the beaches of Barobo are aware of the problem of marine litter and see the tourism sector as a source of waste, notably plastics.&#x0D; Originality: This research paper submitted by us is an outcome of our independent and original work. We have duly acknowledged all the sources from which the ideas and extracts have been taken. The paper is free from any plagiarism and has not been submitted elsewhere for publication.&#x0D;

Three-dimensional evaluation of beaches of oceanic islands as reservoirs of plastic particles in the open ocean

The quantification of plastic debris on beaches has been extensively used as an indicator of plastic pollution in the marine environment. However, most efforts have focused on surface layers, with few investigations looking deeper into the substrate, thus underestimating total standing stocks. Such information is crucial to improve our understanding of where plastic accumulates in the oceans. In this study, we investigated the three-dimensional distribution of plastic (>1 mm) in three sandy beaches located in oceanic islands of the North Atlantic (Azores and the Canary Islands) that are known to accumulate significant quantities of small plastic debris at the surface layer. On each beach, we collected a total of 16 sediment cores down to 1 m depth, from the high tide line up to the backshore following a stratified random sampling design spread across four different levels across the beach. Samples were taken every 10 cm down to 1 m into the sand. Our results revealed the presence of plastic items in the deepest layers with subsurface layers accounting for 84 % of the total plastic abundance and with a similar pattern in terms of size, shape, colour and composition. Furthermore, we found increasing plastic concentrations towards the upper levels of the beach, indicating longer term accumulation in the backshore. Collectively, this study suggests that the plastic items reaching sandy beaches of the Macaronesia are being incorporated into its deepest layers, acting as reservoirs of plastic in the open ocean.

Preliminary Assessment into the Prevalence and Distribution of Microplastics in North and South Pacific Island Beaches

Microplastic pollution has become an increasing danger to marine wildlife and ecosystems worldwide. The continued increase in the production of plastic products has caused microplastic pollution to become more distributed, especially along shorelines. Therefore, to better assess the pervasiveness of microplastics around the Pacific Islands, in this work, we conducted a preliminary investigation into the pervasiveness of microplastics along eight different North and South Pacific Island beaches located in New Zealand and Hawaii. Microplastic prevalence was investigated as a function of beach location, sand type, and microplastic type. Our analysis found that all eight locations contained some level of microplastics, and sheltered fine-grained sand beaches contained the highest level of microplastics, with the largest particle size distribution. In addition, spectroscopy analysis was conducted to assess the plastic type, which showed that nylon and polypropylene were the most common types of microplastics among the tested samples. The results of this study offer a preliminary insight into the microplastic accumulation among different beaches, indicating that sheltered fine-grained beaches and ecosystems may be more susceptible to microplastic accumulation.

Plastiglomerates from uncontrolled burning of plastic waste on Indonesian beaches contain high contents of organic pollutants

This study reports on plastiglomerate and other new forms of plastic pollution in the tropical marine continent of Indonesia. Twenty-five samples were collected from an island beach in the Java Sea where plastiglomerate, plasticrusts, and pyroplastic were formed by the uncontrolled burning of plastic waste. The most common plastic types were polyethylene and polypropylene (PE/PP), as shown by ATR-FTIR spectroscopy. However, acrylates/polyurethane/varnish (PU) and a copolymer of styrene and acrylonitrile were found as well. This suggests that plastiglomerates can form from a wider variety of plastic polymers than previously reported. FTIR analysis also indicates thermo-oxidative weathering, making the charred plastic more brittle and susceptible to microplastic formation. A subset of the samples was analyzed for associated chemical contaminants. One plastiglomerate with a PU matrix showed high concentrations of phthalates. All samples had high concentrations of polycyclic aromatic hydrocarbons (PAHs), likely due to the burning of the plastic in open fires. The burning leads to a change in the physical and chemical properties of the plastics contained in the plastiglomerates. Plastiglomerate and plastic waste of similar origin are therefore often more weathered and contaminated with organic pollutants than their parent polymers. The highest PAH concentration was found in a plastitar sample. Plastitar is defined as an agglomerate of tar and plastics that adheres to coastal rocks. In contrast, our study documents a more mobile, clastic plastitar type. This clastic plastitar could pose an additional ecological risk because of its mobility. These new types of plastic pollution could be an important vector for chemical contamination of nearby coastal habitats such as coral reefs, seagrass meadows, and mangroves.

Comparison of Soil Moisture Content Retrieval Models Utilizing Hyperspectral Goniometer Data and Hyperspectral Imagery From an Unmanned Aerial System

AbstractTo understand surface biogeophysical processes, accurately evaluating the geographical and temporal fluctuations of soil moisture is crucial. It is well known that the surface soil moisture content (SMC) affects soil reflectance at all solar spectrum wavelengths. Therefore, future satellite missions, such as the NASA Surface Biology and Geology mission, will be essential for mapping and monitoring global soil moisture changes. Our study compares two widely used moisture retrieval models: the multilayer radiative transfer model of soil reflectance (MARMIT) and the soil water parametric (SWAP)‐Hapke model. We evaluated the SMC retrieval accuracy of these models using unmanned aerial systems (UAS) hyperspectral imagery and goniometer hyperspectral data. Laboratory analysis employed hyperspectral goniometer data of sediment samples from four locations reflecting diverse environments, while field validation used hyperspectral UAS imaging and coordinated ground truth collected in 2018 and 2019 from a barrier island beach at the Virginia Coast Reserve Long‐Term Ecological Research site. The (SWAP)‐Hapke model achieves comparable accuracy to MARMIT using laboratory hyperspectral data but is less accurate when applied to UAS hyperspectral imagery than the MARMIT model. We proposed a modified version of the (SWAP)‐Hapke model, which achieves better results than MARMIT when applied to laboratory spectral measurements; however, MARMIT's performance is still more accurate when applied to UAS imagery. These results are likely due to differences in the models' descriptions of multiply‐scattered light and MARMIT's more detailed description of air‐water interactions.

Numerical Simulation of the Beach Response Mechanism under Typhoon Lekima: A Case Study of the Southern Beach of Chudao

Typhoons play an important role in beach evolution. The storm surge and large waves caused by typhoons can cause significant changes in beach morphology in a short period of time. The mechanism of beach evolution and profile changes during typhoons is significantly different from that under non-typhoon dynamic conditions. The XBeach numerical model provides an effective tool for predicting the response of sandy coasts to typhoons. This study is based on field-collected long-term beach profile elevations and grain size data, which were used to establish a two-dimensional XBeach model for simulating the morphological evolution of Cudao Island Beach under Typhoon Lekima. The GSA (Generalized Sensitivity Analysis) method was used to determine the sensitivity order of several important parameters in this modeling. Four different moments of wave height variation were selected during the typhoon process to analyze and study beach evolution. The results show that Chudao South Beach is always in a state of erosion during the typhoon period. The wave water increase is apparent in the nearshore wave-breaking area. The beach shoulder in the northeastern part of the beach is short, and the profile, with a short length, responds quickly to the typhoon. The eroded sediment is mainly deposited in the lower part of the intertidal zone or even transported outside of the wave-breaking zone, and a small part is transported to the shore and deposited in the high-tide zone. The continuous sediment transport along the coast of Chudao Beach is an important factor that influenced the evolution of each profile during Typhoon Lekima.

Characteristics of Marine Litter on Island Beaches in the Most Active Aquaculture Coastal Area of Korea

Characteristics of Marine Litter on Island Beaches in the Most Active Aquaculture Coastal Area of Korea

Marine debris in tourism area of Dodola Island Beach, Morotai Island District

Coastal and marine areas are very vulnerable to various pollution threats from human domestic activities (marine debris), industry (fishery management) and other activities. One of the the problems faced in the management of Dodola island tourism was marine debris. This study aims to determine the composition of marine debris generated from tourism activities. Futhermore this study was necessary as basic information to formulate appropriate strategies in managing marine debris. This research was conducted from August to September 2021. Observations were made by visual observation at porposive area. Analysis of the type and weight taken from the observed waste such as the number of pieces, weight, composition and density of solid waste and separated according to the type of organic and inorganic. This result showed inorganic waste such as plastic bottles and cups, plastic packages, Styrofoam, sandals/shoes, glass bottles, diapers, cardboard and aluminum cans with a total of 664 items or 58% pieces, while for organic waste consisting of wood, bamboo, coconut and nipa fruit and banana leaves, with the number of pieces as much as 473 items or 42%. Organic waste has a weight of 203,422 grams or 85% and organic marine waste is 35,915 grams or 15%. The types of organic waste with the highest and heaviest amounts were bamboo 70.51% and 73.77%. Meanwhile, the type of inorganic waste with the highest amount was plastic bottles/cups 79.17% and the heaviest type of waste was glass bottles 55.08%.Keywords:Marine debrisGPSOrganicInorganic