Island Locations Research Articles

Cascading feeder vessels and the rationalisation of small container ports

Small container ports rely on feeder services from hub ports to provide access to unitised trade flows for their hinterlands. They generally possess limited water depth and handling facilities, as investments required to handle larger vessels are not justified by their low container throughput. This paper questions the future of small ports due to larger vessels cascading down as a result of ever-larger vessels on the major trade lanes.The paper uses vessel call data to identify all world ports currently served by sub-1000 TEU vessels. Data on the dimensions of the vessel fleet and order book are analysed in conjunction with accessibility constraints at these small ports. Results show that with 15% of the sub-1000 TEU fleet currently laid up and very few on order, larger feeders with deeper drafts seem certain to serve at least some of these routes. But with 90 container ports (21%) having berth depth of less than 9.1m and the need to accommodate design drafts of at least 8.7m, larger vessels will threaten the viability of these ports unless they commit significant investment. A geographical analysis is also conducted, mapping the distribution of small ports across the globe and classifying coastal, estuary, river and island locations, as well as identifying clusters of small ports that could in future be served by second-tier hubs, such as Southeast Asia and the Baltic Sea.Findings suggest that, just as container ports at the larger end of the scale were rationalised as flows concentrated at major hubs, several drivers exist for the same process to occur at small ports. Consequently, the paper asks how small ports and local shippers will cope, whether such ports lose their connections entirely, if local shippers must pay for an additional handling cost to tranship a second time from large feeder to small feeder, or whether they rely on overland transport links.

Improved Algorithm for the Location of CPG Islands in Genomic Sequences Using Discrete Wavelet Transforms

Improved Algorithm for the Location of CPG Islands in Genomic Sequences Using Discrete Wavelet Transforms

Search of islands of stability for hypothetical superheavy nuclei using covariant density functional theory

A systematic search for the location of islands of stability has been performed for the proton number $100\le Z\le 220$ and the neutron number $Z+30\le N\le 2Z+30$ using covariant density functional theory (CDFT), a relativistic Hartree-Bogoliubov (RHB) formalism with separable pairing, for two different force parameters, DD-ME2 and NL3*. Locations of the islands of stability are identified by analysis of the two-neutron and two-proton separation energy, two-nucleon shell gaps, vanishing neutron and proton pairing gap, energy surface, and the single particle states. The results show that beyond $^{292}120$ only Z = 154 and N $>$ 220 can be a center of a new island of stability.

The risk of pedestrian collisions with peripheral visual field loss.

Patients with peripheral field loss complain of colliding with other pedestrians in open-space environments such as shopping malls. Field expansion devices (e.g., prisms) can create artificial peripheral islands of vision. We investigated the visual angle at which these islands can be most effective for avoiding pedestrian collisions, by modeling the collision risk density as a function of bearing angle of pedestrians relative to the patient. Pedestrians at all possible locations were assumed to be moving in all directions with equal probability within a reasonable range of walking speeds. The risk density was found to be highly anisotropic. It peaked at ≈45° eccentricity. Increasing pedestrian speed range shifted the risk to higher eccentricities. The risk density is independent of time to collision. The model results were compared to the binocular residual peripheral island locations of 42 patients with forms of retinitis pigmentosa. The natural residual island prevalence also peaked nasally at about 45° but temporally at about 75°. This asymmetry resulted in a complementary coverage of the binocular field of view. Natural residual binocular island eccentricities seem well matched to the collision-risk density function, optimizing detection of other walking pedestrians (nasally) and of faster hazards (temporally). Field expansion prism devices will be most effective if they can create artificial peripheral islands at about 45° eccentricities. The collision risk and residual island findings raise interesting questions about normal visual development.

Research challenges and conservation implications for urban cat management in New Zealand

Over the past 20 years, conservation efforts in New Zealand have moved from being concentrated in rural and isolated island locations, where exotic mammalian predators are often controlled, to begin to bring native fauna back to major cities. However, human–wildlife conflicts arise when conservation occurs in close proximity to cities. These are particularly intense when companion animals are involved either as potential predators or prey of high-value conservation animals. Within New Zealand, this conflict is particularly fraught around domestic cats (Felis catus) in the urban environment. Cats in New Zealand are recognised as major introduced predators of native fauna, but they also prey on small introduced predatory mammals. This dynamic causes much conflict between people with different attitudes towards animals; however, as yet, few studies have explored the role(s), either negative or positive, of urban cats in New Zealand. Here, we review current knowledge on domestic cats in urban New Zealand, identify gaps in knowledge and make suggestions for future research, which includes further social science research, citizen science-based research programs, market research, investigation into cat-management legislation, and more in-depth studies of cat diseases and zoonoses. These data are vital for informing the public and improving the management of urban cat populations, including mitigating conservation impacts. Urban ecologists will need to be versatile in the way they design and conduct experiments, exploiting multiple disciplines to both ensure scientific robustness, but also community and government support for uptake of results into management and legislation.

Wing geometry of Phlebotomus stantoni and Sergentomyia hodgsoni from different geographical locations in Thailand

Geographic populations of the two main sandflies genera present in Thailand were studied for species and population identification. Size and shape of Phlebotomus stantoni and Sergentomyia hodgsoni from different island and mainland locations were examined by landmark-based geometric morphometrics. Intraspecific and interspecific wing comparison was carried out based on 12 anatomical landmarks. The wing centroid size of P. stantoni was generally larger than that of S. hodgsoni. Within both species, wings from the continent were significantly larger than those from island populations. Size variation could be significant between geographic locations, but could also overlap between genera. The wing venation geometry showed non-overlapping differences between two species. The within-species variation of geometric shape between different geographical locations was highly significant, but it could not interfere with the interspecies difference. The lack of species overlapping in shape, and the high discrimination between geographic populations, make geometric shape a promising character for future taxonomic and epidemiological studies.

Housing and resilience: case studies from the Cook Islands

Purpose The purpose of this paper is to discuss a tool for evaluating resilience of housing, which was tested in the Cook Islands. The Pacific Islands is widely known as being highly vulnerable to climate change impacts. In addition to long-term impacts such as sea level rise, current impacts such as tropical cyclones wreak havoc and the housing sector is often most severely affected. There is therefore a critical need for assessing the resilience of housing in the region. In response to that need, an evaluation tool for assessing housing resilience was developed, discussed in this paper. Design/methodology/approach The analytical framework of the tool consists of five main factors – inputs, output, result, impacts & effects and external factors – and the tool was tested in the Cook Islands. Two housing case studies implemented and/or facilitated by Australia-based agencies on two different island locations were examined: On Aitutaki, it was a reconstruction project built after Cyclone Pat in 2010; in Mangaia, it was a program for strengthening roofing against cyclones. Findings It was found that in different ways both the projects had improved the resilience of the beneficiary communities. However, a number of challenges were also evident in meeting the wider needs of the beneficiaries and long-term sustainability. The sustainability of these interventions, and indeed that of the islands facing severe resource constraints and rapid demographic and environmental change, posed serious questions. Originality/value The study allowed confirming the importance of the evaluation tool in the global context of climate change and consequent widespread disaster occurrence, and the devastating impact on the housing sector. In that respect, while there are obvious implications for other Pacific islands, the findings of the study offer wider global lessons for the multiplicity of agencies engaged in housing reconstruction, disaster risk reduction and development.

Tourism development progress of two islands of Malaysia

Purpose The purpose of this paper is to look at the physical tourism impacts experienced by the communities of Redang Island and Perhentian Island – two tourist islands located close to the coast of Peninsular Malaysia. The physical tourism impacts are examined via environmental and infrastructure related attributes (19 attributes), which are further categorized into sustainability, environment, greenhouse effects, public and tourist facilities maintenance, sewage system management, rural areas and deforestation. All of these indicators indirectly measure the impact of climate change in these island destinations. Design/methodology/approach The paper uses a questionnaire survey with an instrument based on prior work by Ap and Cromptom (1998) with regard to air pollution, deforestation and land fertility; Tetlow and Hanusch (2012) in relation to biodiversity; Sunlu (2003) in line with greenhouse effects, water quality, natural landscape and solid waste; and Cessford and Dingwall (1999), corresponding to physical impacts. Findings Results for Perhentian Island indicate serious physical impacts resulting from tourism development, compared with less serious impacts on Redang Island. Both islands were observed to experience tourism development progress that is well-blended with their natural environment, and the level of physical impact dependency on tourism development can be assessed using the environmental and infrastructure variables. Research limitations/implications While the paper reports on findings from both Perhentian and Redang Islands, results from this paper could well represent other communities in many other Malaysian island locations (or perhaps the wider region), facing a similar phenomenon. Originality/value The paper contributes to an understanding of how to investigate each variable independently, as each island is undergoing a different lifecycle phase, regardless of the fact that some islands may be mirroring each other. In addition, the paper envisages the importance of integrating social exchange theory and integrated threat theory, when it comes to evaluating how people judge the consequences of their actions.

A shallow water model for computing water level due to tide and surge along the coast of Bangladesh using nested numerical schemes

A vertically integrated shallow water model is developed for computing water levels due to the nonlinear interaction of tide and surge associated with some storms that hit the coast of Bangladesh. Emphasis is given on the investigation of tide generating forces for the purpose of increasing accuracy in water levels due to a storm. Offshore islands of the whole coastal belt along with the complex land–sea interface is modeled via stair step because of the application of a rectangular grid. Nested numerical schemes are exercised in this study to save computational cost. Appropriate tidal regime over the model domain is generated by forcing the sea level to be oscillatory with the constituent M2 along the southern open boundary of the parent model omitting wind stress and tide generating forces. The previously generated tidal regime is introduced as the initial state of the sea for the nonlinear interaction of tide and surge. The model is applied to estimate water levels at different coastal and island locations of Bangladesh associated with the two recent storms AILA and SIDR that hit the coast of Bangladesh. The results simulated by the model are found to be satisfactory with observed data and reported results obtained through various investigations.

Population structure and cryptic speciation in bonnethead sharks Sphyrna tiburo in the south-eastern U.S.A. and Caribbean.

Population structure and lineage diversification within a small, non-dispersive hammerhead shark species, the bonnethead shark Sphyrna tiburo, was assessed. Sphyrna tiburo is currently described as one continuously distributed species along the Atlantic continental margins of North, Central and South America, but recent genetic analysis of an insular population (Trinidad) suggests the possibility of cryptic speciation. To address this issue S. tiburo were sampled at six sites along c. 6200 km of continuous, continental coastline and from one island location (Grand Bahama) across a discontinuity in their distribution (the Straits of Florida), in order to test if they constitute a single lineage over this distribution. A total of 1030 bp of the mitochondrial control region (CR) was obtained for 239 S. tiburo, revealing 73 distinct haplotypes, high nucleotide diversity (0·01089) and a pair of highly divergent lineages estimated to have separated 3·61-5·62 million years ago. Mitochondrial cytochrome oxidase I and nuclear internal transcribed spacer loci show the same pattern. Divergence is similar within S. tiburo to that observed between established elasmobranch sister species, providing further evidence of cryptic speciation. A global AMOVA based on CR confirms that genetic diversity is primarily partitioned among populations (ΦST = 0·828, P < 0·001) because the divergent lineages are almost perfectly segregated between Belize and North America-The Bahamas. An AMOVA consisting solely of the North American and Bahamian samples is also significantly different from zero (ΦST = 0·088, P < 0·001) and pairwise FST is significantly different between all sites. These findings suggest that S. tiburo comprises a species complex and supports previous research indicating fine population structure, which has implications for fisheries management and biodiversity conservation.

A power analysis of a transforming marine community around oil transshipment at St. Eustatius

The strategic location of small islands in the Caribbean, close to the United States of America (USA), and their historical trade roots as former colonies of Europe make them an interesting business environment. Small islands' eagerness for economic development and their limited governance capacity often result in an unequal relationship between multinational private parties and small islands' policy actors, especially in regard to environmental management. This is also observed at St. Eustatius, a small Caribbean island that hosts a crucial oil storage and transshipment terminal that compromises the environmental state of the small island. However, in 2010, St. Eustatius (Statia) became part of the Netherlands, which significantly changed the responsibilities related to environmental management. Bringing the environmental state back in reversed existing power relations. To analyze these changing power dynamics, we apply the new social scientific concept of marine community, which encompasses a user community and a policy community and shows the different interests and power dynamics within and between them. While governance of the oil terminal used to be determined by structural power in the user community on behalf of NuStar, it currently relies on the structural power of the Dutch Ministry of Infrastructure and Environment (I&E) in the policy community. In theory, structural power to bring the environmental state back in would be beneficial for governance. In practice, however, this is challenging because a small island environmental state is different from the environmental state in countries in Western societies. Although the Dutch Ministry has structural power, the way it relates to others (dispositional power) and uses resources (relational power) should be better adapted to the needs and characteristics of small island environmental states such as Statia.

Short term solar radiation forecasting: Island versus continental sites

Due its intermittency, the large-scale integration of solar energy into electricity grids is an issue and more specifically in an insular context. Thus, forecasting the output of solar energy is a key feature to efficiently manage the supply-demand balance.In this paper, three short term forecasting procedures are applied to island locations in order to see how they perform in situations that are potentially more volatile than continental locations. Two continental locations, one coastal and one inland are chosen for comparison. At the two time scales studied, ten minute and hourly, the island locations prove to be more difficult to forecast, as shown by larger forecast errors.It is found that the three methods, one purely statistical combining Fourier series plus linear ARMA models, one combining clear sky index models plus neural net models, and a third using a clear sky index plus ARMA, give similar forecasting results.It is also suggested that there is great potential of merging modelling approaches on different horizons.

Precipitation sensitivity to warming estimated from long island records

Some of the most damaging impacts of climate change are a consequence of changes to the global water cycle. Atmospheric warming causes the water cycle to intensify, increasing both atmospheric water vapor concentrations and global precipitation and enhancing existing patterns of precipitation minus evaporation (P − E). This relationship between temperature and precipitation therefore makes understanding how precipitation has changed with global temperatures in the past crucial for projecting changes with future warming. In situ observations cannot readily estimate global precipitation sensitivity to temperature (dP/dT), as land precipitation changes are affected by water limitation. Satellite observations of precipitation over ocean are only available after 1979, but studies based on them suggest a precipitation sensitivity over wet tropical (30N–30S) oceans that exceeds the Clausius–Clapeyron value. Here, we determine for the first time precipitation sensitivity using longer (1930–2005), island-based in situ observations to estimate dP/dT over islands. The records show a robust pattern of increasing precipitation in the tropics and decreasing precipitation in the subtropics, as predicted from physical arguments, and heavy precipitation shows a stronger sensitivity than mean precipitation over many islands. The pattern and magnitude of island-based dP/dT agree with climate models if masked to island locations, supporting model predictions of future changes.

Design of Control System for Suppression of Neoclassical Tearing Modes with Electron Cyclotron Heating and Current Drive on EAST

This paper discusses a control system for the Experimental Advanced Superconducting Tokamak (EAST) that suppresses neoclassical tearing modes (NTMs) (3/2 and 2/1) by applying electron cyclotron (EC) heating and current drive. It allows the magnetic island to be detected and localized in real time and the EC beam to be deposited exactly on the island position by stepwise tuning of the steerable launch mirror. The mode features are identified with temperature perturbation to develop the algorithm for real-time island location. The necessary parameters for the design of the control system are discussed and determined based on simulation of the nonlinear island growth of NTMs with application of EC current drive. Although similar work has been done on many other devices, this is the first attempt on EAST.

Rethinking education: enhancing inclusive and accessible educational engagement for remote, rural and islands General Practitioners

Remote, rural and islands General Practitioners can find geographical isolation challenging in the context of accessing appropriate education, alongside networking opportunities with peers for support, CPD and sharing developing best practice. The RRHEAL Rural GP VC Education network was established to help support remote and rural practitioner colleagues with sharing of good practice and continuous professional development (http://www.rrheal.scot.nhs.uk/what-we-do/programmes-and-events/rural-gp-vc-education-network.aspx). RRHEAL committed to deliver an initial series of 'at distance' sessions using videoconference and Jabber, enabling a wide range of participants to join from remote, rural and island locations. The sessions spotlight selected 'hot rural practice topics' enabling practitioners to share evidence based presentations and facilitated discussion with a focus on applications to clinical practice. Bimonthly networked sessions have been offered to a range of locations and practitioners, with up to 19 sites participating at any one time. The presentation shares the findings of an ongoing qualitative evaluation of this initial educational series, which is informing next steps for ongoing educational support, audience engagement and content inclusion. There is a strong appetite for such at distance, inclusive, educational and networked engagement. The presented context must be contextually accurate and appropriate. Structure and rigorous VC etiquette enhance productivity of such applications focused discussion across a highly dispersed audience. At distance, inclusive engagement such as this is an underutilised form of educational support and professional enrichment for remote, rural, island and other hard to reach health and social care teams.This abstract was presented at the Innovative Solutions in Remote Healthcare - 'Rethinking Remote' conference, 23-24 May 2016, Inverness, Scotland.

AUTOMATIC EXTRACTION OF MANGROVE VEGETATION FROM OPTICAL SATELLITE DATA

Mangrove, the intertidal halophytic vegetation, are one of the most significant and diverse ecosystem in the world. They protect the coast from sea erosion and other natural disasters like tsunami and cyclone. In view of their increased destruction and degradation in the current scenario, mapping of this vegetation is at priority. Globally researchers mapped mangrove vegetation using visual interpretation method or digital classification approaches or a combination of both (hybrid) approaches using varied spatial and spectral data sets. In the recent past techniques have been developed to extract these coastal vegetation automatically using varied algorithms. In the current study we tried to delineate mangrove vegetation using LISS III and Landsat 8 data sets for selected locations of Andaman and Nicobar islands. Towards this we made an attempt to use segmentation method, that characterize the mangrove vegetation based on their tone and the texture and the pixel based classification method, where the mangroves are identified based on their pixel values. The results obtained from the both approaches are validated using maps available for the region selected and obtained better accuracy with respect to their delineation. The main focus of this paper is simplicity of the methods and the availability of the data on which these methods are applied as these data (Landsat) are readily available for many regions. Our methods are very flexible and can be applied on any region.

AUTOMATIC EXTRACTION OF MANGROVE VEGETATION FROM OPTICAL SATELLITE DATA

Abstract. Mangrove, the intertidal halophytic vegetation, are one of the most significant and diverse ecosystem in the world. They protect the coast from sea erosion and other natural disasters like tsunami and cyclone. In view of their increased destruction and degradation in the current scenario, mapping of this vegetation is at priority. Globally researchers mapped mangrove vegetation using visual interpretation method or digital classification approaches or a combination of both (hybrid) approaches using varied spatial and spectral data sets. In the recent past techniques have been developed to extract these coastal vegetation automatically using varied algorithms. In the current study we tried to delineate mangrove vegetation using LISS III and Landsat 8 data sets for selected locations of Andaman and Nicobar islands. Towards this we made an attempt to use segmentation method, that characterize the mangrove vegetation based on their tone and the texture and the pixel based classification method, where the mangroves are identified based on their pixel values. The results obtained from the both approaches are validated using maps available for the region selected and obtained better accuracy with respect to their delineation. The main focus of this paper is simplicity of the methods and the availability of the data on which these methods are applied as these data (Landsat) are readily available for many regions. Our methods are very flexible and can be applied on any region.

Development of Tide–Surge Interaction Model for the Coastal Region of Bangladesh

In this paper, a two-dimensional, vertically integrated hydrodynamic model is developed taking into account entrained air bubbles during storm surges as well as incorporating inverted barometer, and river and land dynamics. The model is specifically designed for the coastal region of Bangladesh. A nested scheme method with a fine mesh scheme (FMS), capable of incorporating the complex coastline and all major offshore islands accurately, nested into a coarse mesh scheme (CMS) covering up to 15° N latitude in the Bay of Bengal is used. To incorporate the small and big offshore islands in the Meghna estuarine region with its complex coastline accurately, a very fine mesh scheme (VFMS) is again nested into the FMS. Along the northeast corner of the VFMS, the Meghna river discharge is taken into account. The coastal and island boundaries are approximated through proper stair steps. The model equations are solved by a semi-implicit finite difference technique using a staggered C-grid. A stable appropriate tidal condition over the model domain is generated by applying tidal forcing with the four major tidal constituents M2, S2, K1, and O1 along the southern open boundary of the CMS. This tidal regime is introduced as the initial state of the sea for nonlinear interaction of tide and surge. The model is applied to simulate water levels due to the interaction of tide and surge associated with the cyclones April 1991 and Aila at different coastal and island locations along the coast of Bangladesh. The results are found to be quite satisfactory with root mean square error of ∼0.50 m as calculated for both the storm events. Tests of sensitivities on water levels are carried out for air bubbles, offshore islands, river discharge, inverse barometer, and grid resolution. The presence of air bubbles increases simulated water levels a little bit in our model, and the contribution of air bubbles in increasing water level is found around 2 %. Further, water levels are found to be influenced by offshore islands, river discharge, inverse barometer as well as grid resolution.

Changes to extreme wave climates of islands within the Western Tropical Pacific throughout the 21st century under RCP 4.5 and RCP 8.5, with implications for island vulnerability and sustainability

Waves are the dominant influence on coastal morphology and ecosystem structure of tropical Pacific islands. Wave heights, periods, and directions for the 21st century were projected using near-surface wind fields from four atmosphere–ocean coupled global climate models (GCM) under representative concentration pathways (RCP) 4.5 and 8.5. GCM-derived wind fields forced the global WAVEWATCH-III wave model to generate hourly time series of bulk wave parameters around 25 islands in the mid to western tropical Pacific Ocean for historical (1976–2005), mid-century, and end-century time periods for the December–February and June–August seasons. The December–February regional wave climate is dominated by strong winds and large swell from extratropical cyclones in the north Pacific while the June–August season brings smaller waves generated by the trade winds and swell from Southern Hemisphere extratropical storms. Extreme significant wave heights decreased (~10.0%) throughout the 21st century under both climate scenarios compared to historical wave conditions and the higher radiative forcing RCP 8.5 scenario displayed a greater and more widespread decrease in extreme significant wave heights compared to the lower forcing RCP 4.5 scenario. An exception was for the end-century June–August season. Offshore of islands in the central equatorial Pacific, extreme significant wave heights displayed the largest changes from historical values. The frequency of extreme events during December–February decreased under RCP 8.5, whereas the frequency increased under RCP 4.5. Mean wave directions rotated more than 30° clockwise at several locations during June–August, which could indicate a weakening of the trade winds' influence on extreme wave directions and increasing dominance of Southern Ocean swell. The results of this study underscore that December–February large wave events will become smaller and less frequent in most regions, reducing the likelihood and magnitude of wave-driven flooding at these island locations over the 21st century. However, relatively large increases in the mean of the top 5% of significant wave heights and large changes to the mean direction of these waves in the June–August season at several islands within 150–180° E will drive greater flooding and island morphological change along previously more stable shorelines. The reported results herein project large changes to tropical Pacific island wave climates that will be necessary for assessing island vulnerability under climate change in future studies.

On the rotation of co-orbital bodies in eccentric orbits

We investigate the resonant rotation of co-orbital bodies in eccentric and planar orbits. We develop a simple analytical model to study the impact of the eccentricity and orbital perturbations on the spin dynamics. This model is relevant in the entire domain of horseshoe and tadpole orbit, for moderate eccentricities. We show that there are three different families of spin-orbit resonances, one depending on the eccentricity, one depending on the orbital libration frequency, and another depending on the pericenter's dynamics. We can estimate the width and the location of the different resonant islands in the phase space, predicting which are the more likely to capture the spin of the rotating body. In some regions of the phase space the resonant islands may overlap, giving rise to chaotic rotation.