Activities In Coastal Areas Research Articles

Swimming against the flow-Environmental DNA can detect bull sharks (Carcharhinus leucas) across a dynamic deltaic interface.

Human activities in coastal areas are accelerating ecosystem changes at an unprecedented pace, resulting in habitat loss, hydrological modifications, and predatory species declines. Understanding how these changes potentially cascade across marine and freshwater ecosystems requires knowing how mobile euryhaline species link these seemingly disparate systems. As upper trophic level predators, bull sharks (Carcharhinus leucas) play a crucial role in marine and freshwater ecosystem health. Telemetry studies in Mobile Bay, Alabama, suggest that bull sharks extensively use the northern portions of the bay, an estuarine–freshwater interface known as the Mobile‐Tensaw Delta. To assess whether bull sharks use freshwater habitats in this region, environmental DNA surveys were conducted during the dry summer and wet winter seasons in 2018. In each season, 5 × 1 L water samples were collected at each of 21 sites: five sites in Mobile Bay, six sites in the Mobile‐Tensaw Delta, and ten sites throughout the Mobile‐Tombigbee and Tensaw‐Alabama Rivers. Water samples were vacuum‐filtered, DNA extractions were performed on the particulate, and DNA extracts were analyzed with Droplet Digital™ Polymerase Chain Reaction using species‐specific primers and an internal probe to amplify a 237‐base pair fragment of the mitochondrial NADH dehydrogenase subunit 2 gene in bull sharks. One water sample collected during the summer in the Alabama River met the criteria for a positive detection, thereby confirming the presence of bull shark DNA. While preliminary, this finding suggests that bull sharks use less‐urbanized, riverine habitats up to 120 km upriver during Alabama's dry summer season.

Evaluating the Potential Antibiotic Resistance Status in Environment Based on the Trait of Microbial Community.

The overuse of antibiotics has promoted the propagation and dissemination of antibiotic resistance genes (ARGs) in environment. Due to the dense human population and intensive activities in coastal areas, the health risk of ARGs in coastal environment is becoming a severe problem. To date, there still lacks of a quantitative method to assess properly the gross antibiotic resistance at microbial community level. Here, we collected sediment samples from Hangzhou Bay (HB), Taizhou Bay (TB), and Xiangshan Bay (XB) of the East China Sea for community-level ARGs analysis. Based on the 16S rRNA genes and predictive metagenomics, we predicted the composition of intrinsic ARGs (piARGs) and some related functional groups. Firstly, a total of 40 piARG subtypes, belonging to nine drug classes and five resistance mechanisms, were obtained, among which the piARGs encoding multidrug efflux pumps were the most dominant in the three bays. Secondly, XB had higher relative abundances of piARGs and pathogens than the other two bays, which posed higher potential health risk and implied the heavier impact of long-term maricultural activities in this bay. Thirdly, the co-occurrence network analysis identified that there were more connections between piARGs and some potential pathogenic bacteria. Several piARG subtypes (e.g., tetA, aacA, aacC, and aadK) distributed widely in the microbial communities. And finally, the microbial diversity correlated negatively with the relative abundance of piARGs. Oil, salinity, and arsenic had significant effects on the variations of piARGs and potential pathogenic bacteria. The abundance-weighted average ribosomal RNA operon (rrn) copy number of microbial communities could be regarded as an indicator to evaluate the antibiotic resistance status. In conclusion, this study provides a new insight on how to evaluate antibiotic resistance status and their potential risk in environment based on a quantitative analysis of microbial communities.

Community Group Networking on the Community-based Adaptation Measure in Tapak Village, Semarang Coastal Area

The north coast of Central Java is one of the most vulnerable regions to climate change in Indonesia. Various activity in coastal area also leads to the growing of informal sector that closely related to the growing number of poor people in coastal area. Therefore, the loss of livelihood triggers the awareness of stakeholder to help people through Community-based Adaptation (CBA) in Semarang coastal area. This paper aims to elaborate on the importance of networking aspect in CBA that works in Semarang Coastal Area. Scope area of this research is Tapak Village which regarded as a pilot area of CBA implementation in Semarang. Stakeholders mapping and social network analysis was used to visualizing the community interaction in their adaptation measures. The purposive sample in interviewing CBA stakeholders is used to support the stakeholder analysis using Gephi 0.9 software. The finding shows that the existence of networks between the community and the relevant stakeholders such as NGO and local government also became one of the supporting factors for the sustainability of community-based adaptation approach in coastal areas of Semarang City.

Dinoflagellate cyst assemblages as indicators of environmental conditions and shipping activities in coastal areas of the Black and Caspian Seas

Pontocaspian ecosystems have deteriorated due to increasing anthropogenic pressures, including shipping activities. We studied the relationships between sedimentology, environmental and shipping variables, and the dinocyst distribution and abundance across the Pontocaspian region. Cyst diversity was characterized by the presence of 36 dinocyst morphotypes. Western Black Sea assemblages were dominated by Lingulodinium machaerophorum and Round brown cysts reaching values of 60% and 31.6% respectively. Lingulodinium machaerophorum, Impagidinium caspienense and Round brown cysts dominate the Caspian Sea assemblages with relative abundances of 80, 68 and 52%, respectively. Temperature, salinity and primary productivity are the main drivers for dinocyst distribution and species assemblages. Temperature controls the distribution and relative abundance of the potentially toxic species L. machaerophorum. Dinocysts assemblages reflect enriched-nutrient conditions in the North Caspian Sea and the Western Black Sea. Distance from the harbour correlates with dinocyst assemblages in the North and Middle Caspian Sea. This is likely to be related to the high shipping activities.

Flood Risk Evaluation in Ungauged Coastal Areas: The Case Study of Ippocampo (Southern Italy)

The growing concentration of population and the related increase in human activities in coastal areas require numerical simulations to analyze the effects of flooding events that might occur in susceptible coastal areas in order to determine effective coastal management practices and safety measures to safeguard the inhabited coastal areas. The reliability of the analysis is dependent on the correct evaluation of key inputs such as return period of flooding events, vulnerability of exposed assets, and other risk factors (e.g., spatial distribution of elements at risk, their economic value, etc.). This paper defines a methodology to assess the effects of flooding events associated with basin run-off and storm surge in coastal areas. The assessment aims at quantifying in economic terms (e.g., loss of assets) the risk of coastal areas subject to flooding events. The methodology proposed in this paper was implemented to determine the areas subject to inundation on a coastal area in Southern Italy prone to hydrogeological instability and coastal inundation. A two-dimensional hydraulic model was adopted to simulate storm surges generated by severe sea storms coupled with intense rainfalls in order to determine the areas subject to inundation in the low-land area along the Adriatic coast object of this study. In conclusion, the economic risk corresponding to four different flooding scenarios was assessed by correlating the exceedance probability of each flooding scenario with the potential economic losses that might be realized in the inundated areas. The results of the assessment can inform decision-makers responsible for the deployment of risk mitigation measures.

A strategy for monitoring systemic vulnerability to marine erosion and flooding

Littoralisation, or the concentration of people and activities in coastal areas, associated with the intrinsic mobility of coasts and with the context of climate change, tends to increase the vulnerability of coastal areas. This article presents a new interdisciplinary approach towards the concept of vulnerability that makes it possible to move beyond the nature/society dichotomy, and an inter-sectorial researcher-manager method for the development of a series of monitoring indicators for the four components of systemic vulnerability: hazards, stakes, management and representations. These indicators are precursors of an integrated observatory that will act as a source of data for research and inform public policy for coastal areas.

Shoreline changes analysis of Kendal Coastal Area

Shoreline changes occur due to abrasion and accretion processes that are triggered due to intensive human activities in coastal areas. The shoreline in the Kendal region is dynamic, and shows mixed results from tidal and dominated by riverine activity. The Shoreline changes have different impacts, all of which may not be visible. Coastal dynamics in the Kendal region cause spatial-temporal shoreline changes. To observe these we need a long and continuous set of data. The purpose of this study is to determine changes in the shoreline in parts of the Kendal coastal district and to calculate the value of the changes. The data used were derived from TM data 1990, to OLI data 2017. To derive the shoreline from the satellite data, a band ratio of Red band to IR band was employed. The shorelines were digitized and saved along with the appropriate MM/DD/YYYY added to the attribute table. The Digital Shoreline Analysis System (DSAS) was used to compute rate-of-change statistics. The Digital Shoreline Analysis System (DSAS) is an extension of ArcGIS, developed by USGS. Using the extension, transects were laid every 100 m. Then, using NET SHORELINE MOVEMENT (NSM), LINEAR REGRESSION RATE (LRR) and END POINT RATE (EPR), the changes every 100 meters were analyzed and stored in a table. Subsequently, using the table, erosion, and accretion, were analyzed, and understood. The farthest accretion process was 1763.29 m and 792.14 m for the abrasion processes.

Environmental sensitivity index mapping as a prevention strategy against oil spill pollution: A case study on the coastal area of South Sumatera Province in Indonesia

Coastal areas are vulnerable to oil spill pollution from tanker accidents or unappropriated operational procedures from the oil and gas industry. This study was aimed to develop a prevention strategy to minimize damage and to ensure vulnerable natural resources and local community fisheries economic activities in coastal areas are protected. The local community utilizes fisheries resources in coastal waters of South Sumatera Province as their main livelihood. The potential of fish and shrimp resources in this area is quite abundant due to the existence of good mangrove ecosystems and located in the high-organic environment of Musi River estuary. On the other hand, the area is highly potential to be threatened by oil spill accident from the nearby of Bangka Strait just right in front of the Musi Estuary. A model named Environmental Sensitivity Index (ESI) has been developed to classify the level of sensitivities along the shoreline and habitats of the study area to protect such area. Environmental sensitivity index takes into account the vulnerability, biological and socio-economical characteristics for each coastal environmental feature such as fisheries resources and mangrove ecosystem. These three fundamental ESI elements are transferred into three indexes, i.e. Vulnerability Index, Ecological Index and Social Index. Spatial analysis through the geographic information system of overlay technique is applied to determine each environmental feature to produce ESI Map. The results of the ESI analysis show that coastal waters which are habitat of brackish water fishes and shrimps harvested by passive fishing gear such as Kelong (a combination of Guiding Barrier and Fixed lift net) and Sero (Guiding Barrier) are categorized as the sensitive category, while other offshore waters are classed as moderate level. Shoreline type and mangrove ecosystems classified as very sensitive. As consequences, this area must be a top priority in protecting the area from any of oil spill pollution. ESI analysis can be used as an appropriate tool in the determination of priority area need to be protected from any oil spill events.

Using passive acoustic monitoring to investigate the occurrence of cetaceans in a protected marine area in northwest Ireland

Under the EU Habitats Directive, cetacean species must be maintained at favourable conservation status in European waters. Whether this is achieved via protected area designation, curtailment of activities such as fishing or construction, or time restrictions on noise, it is dependent on understanding the temporal patterns in occurrence. Our ability to study this is often limited by the relatively short time-series of data available to researchers. This study uses nine years of passive acoustic monitoring data paired with environmental covariates to better understand the spatio-temporal dynamics of harbour porpoise and dolphin species using generalised estimating equations-generalised linear models (GEE-GLMs). This long-term time-series included periods of increased disturbance due to construction of an underwater gas pipeline in the area, enabling us to investigate the effect of construction on species occurrence. Harbour porpoise and dolphins occurred in every season, with detections peaking in winter. We found a negative association between dolphins and porpoises throughout the year. Inter-annual variation in occurrence was evident, with a cyclical bi-annual pattern highlighted for both species suggesting a complex pattern of movement. Construction activity had a significant negative effect on the presence of porpoise but not dolphins. However, no long-term decrease in detection rates of porpoise was recorded. This study highlights the importance of understanding what factors influence cetacean occurrence as well as the temporal scale of disturbance effects for planning and management of construction activities in coastal areas.

Numerical study of hydrodynamic conditions and sedimentary environments of the suspended kelp aquaculture area in Heini Bay

Kelp aquaculture is one of the most important exploitation and utilization activities in coastal areas. The impacts of high-density kelp aquaculture on coastal area environments are attracting increasing attention. Based on in situ data from the suspended kelp aquaculture area of Heini Bay, numerical simulations were applied to distinguish hydrodynamic and sediment transport features under natural and aquaculture conditions. By comparing model simulations with observations, the calibrated models reflected the hydrodynamic conditions and sedimentary environments in Heini Bay well. Although the kelp scenario model was calibrated by data measured in an early stage of aquaculture and produced a relatively conservative result, the model was able to simulate the trend of sedimentary environment changes in the aquaculture area. The results of the simulations indicated that, after the occurrence of aquaculture activities, the average velocity was reduced by approximately 21% in the waters around Chu Island and Moye Island, and by 50% within the kelp aquaculture area. Along the western edges of the aquaculture area (i.e., the nearshore area), the average velocity barely changed, but the instantaneous velocity during the flood/ebb tide may increase by up to 3 times. The annual maximum erosion rate around Chu Island, Moye Island and Heishi Reef decreased by approximately 30%, and the total range of the erosion area where the erosion intensity was not less than 0.01 m/yr decreased by almost 36%. The deposition area in Heini Bay shifted to deeper waters, and almost the entire kelp aquaculture area was in a deposition state. However, the deposition rates in the aquaculture area were reduced accordingly.

Recreational vessels without Automatic Identification System (AIS) dominate anthropogenic noise contributions to a shallow water soundscape

Recreational boating is an increasing activity in coastal areas and its spatiotemporal overlap with key habitats of marine species pose a risk for negative noise impacts. Yet, recreational vessels are currently unaccounted for in vessel noise models using Automatic Identification System (AIS) data. Here we conduct a case study investigating noise contributions from vessels with and without AIS (non-AIS) in a shallow coastal area within the Inner Danish waters. By tracking vessels with theodolite and AIS, while recording ambient noise levels, we find that non-AIS vessels have a higher occurrence (83%) than AIS vessels, and that motorised recreational vessels can elevate third-octave band noise centred at 0.125, 2 and 16 kHz by 47–51 dB. Accordingly, these vessels dominated the soundscape in the study site due to their high numbers, high speeds and proximity to the coast. Furthermore, recreational vessels caused 49–85% of noise events potentially eliciting behavioural responses in harbour porpoises (AIS vessels caused 5–24%). We therefore conclude that AIS data would poorly predict vessel noise pollution and its impacts in this and other similar marine environments. We suggest to improve vessel noise models and impact assessments by requiring that faster and more powerful recreational vessels carry AIS-transmitters.

SAMPAH LAUT TANGGUNG JAWAB SIAPA? STUDI KASUS KABUPATEN ACEH BARAT

Marine litter is solid material that has been used by people and abandoned or discarded into sewage, river, sea or marine environment. Debris problem in coastal area becomes the urgent issue and concerns many countries across the world particularly marine countries such as Indonesia. The research objective is to examine people perception towards marine litter in Aceh Barat Regency about whom responsible for eradicating marine debris. Researchers conduct the study in January to June 2018 and collect data by distributing questionnaire to 383 respondents. The result shows that 46.2% respondents believe that business activities in coastal area like cafe, hotel, and other business related to marine tourism responsible for keeping the sea clean. In similar, researchers find 38.6% respondent stated that elaminating marine debris is society duty starts from us. The final finding is 36.8% sample shows that researchers are the most motivated stakeholders for reducing marine litter.

Impact of vessel activities in the surrounding waters of China on mainland air quality

Based on the WRF-CMAQ air quality model, quantitatively simulate the impact of the main air pollutant emissions from the ship transportation activities in the surrounding waters on the urban ambient air quality in coastal areas. The results show that in 2014, the annual average contribution rates of NOx, SO2, PM2.5 and PM10 generated by ship activities in coastal areas of China were 5.95%, 2.20%, 1.46% and 1.41%, respectively. The time difference between ship emissions and air quality impact is significant. The average contribution of ships in April and July is about 10% and 3.5%, and the contribution in January and October is only 2% and 0.93%. The contribution rate of ship activities to the annual average concentration in the coastal waters of China is less than 6%. The impact of coastal ship operations on ambient air quality is generally small..

Threats to Russia's Maritime Economic Activity in Coastal Areas of the Indian Ocean and Southeast Asia

Threats to Russia's Maritime Economic Activity in Coastal Areas of the Indian Ocean and Southeast Asia

Gestión de las Zonas Costeras y Marinas en España

The coastal zones of Spain are considered areas of special relevance for the population and its economy. This is due to the fact that the urban population settles and develops economic activities increasingly on the coastal zone. In 2015, almost half the population of the country lived in urban centres of these areas. However, the model of settlement and development of economic activities in coastal areas does not follow patterns towards the sustainability of the coast and the sea. As a consequence, coastal and marine ecosystems are increasingly threatened and degraded, placing services they offer to the population in particular danger. Thus, this research aims to analyse the reality of coastal and marine management in Spain in the last decade (2008-2018 period). In this regard, the manuscript highlights those initiatives that promote the sustainability of the coasts and the sea, as well as those issues that should be addressed to contribute to the human well-being of coastal societies. The methodology used in the research is focused on the analysis of the Integrated Coastal Zone Management Decalogue, in which ten elements related to public management of coastal and marine areas are analysed: Policy, Regulations, Competencies, Institutions, Strategies, Instruments, Training, Economic resources, Information and knowledge, and Participation. Therefore, the results obtained present detailed and updated information on each element of the Decalogue, with the contribution of data on the reality of management in the coastal area of ​​Spain. Finally, the case of the Autonomous Community of Andalusia is studied, with the aim of emphasizing peculiarities of coastal management that some regions of the country have.

Estimasi Stok Karbon pada Biomassa Lamun di Pulau Semak Daun, Kepulauan Seribu

<strong>Carbon Stock Estimation in Seagrass Biomass on Semak Daun Island, Thousand Islands</strong>. Seagrass ecosystem has a vital role in protecting the coastal ecosystem. It can also sequester and store carbon as an organic material (blue carbon) for a long time. However, anthropogenic activities in coastal areas give environmental stress on the seagrass ecosystem. This research was conducted to assess the carbon stock of seagrass biomass in Semak Daun Island in order to evaluate the potential of the seagrass meadows in sequestering carbon. Sampling and observation were held in the seagrass ecosystem to obtain seagrass density, biomass, frequency of occurrence, water quality, and anthropogenic activity. Carbon stock was calculated by the loss of ignition (LOI) method, and combined with density to determine the total carbon stock in the whole area of seagrass meadows. Seagrass species in Semak Daun Island consist of Halophila ovalis, Thalassia hemprichii, Cymodocea rotundata, Syringodium isoetifolium, and Halodule uninervis. The coverage area of seagrass in Semak Daun Island was 9.1 ha with carbon stock value of 1.84 ton C or equivalent to 6.76 ton CO2. Fifty two percent of the carbon stock was originated from the below-ground biomass and 48% from the above-ground biomass.

A new perspective on marine assessment of metals and organic pollutants: A case study from Bay of Santander.

Pollution assessment is worldwide generally performed based on 'Trend assessment' or 'Status assessment´, and usually requires monitoring programs that should be designed in terms of pollutants to be studied, frequency and locations. Five groups of pollutants: polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), polybrominated diphenyl ethers (PBDEs) and trace metals, were selected to evaluate how actual monitoring programs are coping with the evaluation of anthropogenic activities affect the environment and whether use restrictions and laws that ban certain pollutants are being effective. Santander Bay, in Northern Spain, is an industrial area with 250,000 inhabitants and with several rivers discharging into the Bay; those characteristics made the area an adequate location to perform the study. Marine sediment was selected as the study matrix since it gives comprehensive information regarding the human activities in coastal areas. The study clearly shows that there can be some potential biological impacts on the marine environment due to PAHs (mainly BghiP), PCBs (mainly congener CB118) and metals. On the other hand all analysed OCPs and PBDEs presented values below the applicable guidelines and will therefore, in principle, not give rise to environmental problems. Consequently, even after decades of banning and use restrictions, the studied pollutants are still a main issue in coastal areas. Moreover, the present study helps in the definition of future monitoring programs providing a complete description about the current situation of the listed pollutants.

Two-Dimensional Ship Velocity Estimation Based on KOMPSAT-5 Synthetic Aperture Radar Data

Continuously accumulating information on vessels and their activities in coastal areas of interest is important for maintaining sustainable fisheries resources and coastal ecosystems. The speed, heading, sizes, and activities of vessels in certain seasons and at certain times of day are useful information for sustainable coastal management. This paper presents a two-dimensional vessel velocity estimation method using the KOMPSAT-5 (K5) X-band synthetic aperture radar (SAR) system and Doppler parameter estimation. The estimation accuracy was evaluated by two field campaigns in 2017 and 2018. The minimum size of the vessel and signal-to-clutter ratio (SCR) for optimum estimation were determined to be 20 m and 7.7 dB, respectively. The squared correlation coefficient R2 for vessel speed and heading angle were 0.89 and 0.97, respectively, and the root-mean-square errors of the speed and heading were 1.09 m/s (2.1 knots) and 17.9°, respectively, based on 19 vessels that satisfied the criteria of minimum size of vessel and SCR. Because the K5 SAR is capable of observing a selected coastal region every day by utilizing various modes, it is feasible to accumulate a large quantity of vessel data for coastal sea for eventual use in building a coastal traffic model.

Legal Protection for The Indigenous Law Communities and Their Traditional Rights Based on the Verdict of the Constitutional Court

This study covers the problems related to the regulation of Adat (Indigenous) law communities. First, the Law Number 41 of 1999 on Forestry categorizes indigenous forests as State Forest. Therefore, the state has the authority to stipulate indigenous forests as long as the relevant Indigenous Law Communities are still existed and recognized. Second, the Law Number 27 of 2007 on Management of Coastal Areas and Small Islands provides opportunities for owners of large capital through Coastal Water Concession Rights (HP-3), but the substance does not provide space for coastal communities especially fishermen carrying out economic activities in coastal areas. Due to limited capital and technology, coastal communities are not able to compete with large capital owners hence the poverty level of fishermen keeps increasing. Finally, the Law Number 41 of 1999 on Forestry and the Law Number 27 of 2007 on Management of Small Coastal Areas and Islands tested materially to the Constitutional Court. The research method used in this study is normative legal research. The results of the research are forms of legal protection against the existence of indigenous law communities and their traditional rights, which include protection of their indigenous rights over the status and management of indigenous forests and their protection over the management of coastal areas and small islands.

Sea cliff instability susceptibility considering nearby human occupation and predictive capacity assessment

Slope mass movements are the dominant process of sea cliff evolution and are a threat to occupation and human activities located nearby. This fact is compounded with the rapidly increasing human occupation and concentration of economic activities in coastal areas, making cliff hazard assessment a relevant topic. This study was made to assess the effectiveness of a statistically based approach to cliff failure susceptibility assessment in the slowly receding sea cliffs of Mafra County (western coast of Portugal), using the logistic regression method and considering the possible influence of human occupation near the cliffs top, and also to test the true predictive capacity of the susceptibility models produced.The susceptibility assessment was made using number of cliff failure predisposing factors related with geology, geomorphology, wave power and human occupation, which were correlated with a multi-temporal inventory of sea cliff failures for the period 1947–2012, and also with the temporal partition of the cliff failure inventory for the periods 1947 to 1980 and 1980 to 2012, which were used as training and validation sets to test the real predictive capacity of the models generated.The susceptibility models were validated using standard “Receiver Operating Characteristic Curves” (ROC) and the respective “Area Under the Curve” (AUC) which provided encouraging results when compared with the records of past instabilities. However, the predictive capacity computed by the temporal partition of the inventory data was weak, indicating that further studies are required to: 1) assess the monitoring time periods required to provide statistically representative cliff failure inventories in low retreat cliffs, with implication on hazard assessment and long term evolution modeling; 2) cliff failure predisposing factors and their variation along time, namely those related with the human activities and occupation, and also on the cliff failure conditioning and triggering external factors.In spite of this problem, the results obtained with the global inventory data of 1947–2012, which showed good adjustment to the input data, but also on the validation against the time partitions of the inventory, suggest that the selected techniques are viable tools to map sea cliff instability susceptibility and to predict the location of the most critical areas where future instabilities are more likely to occur.