Coastal environment assessment procedure for sustainable wastewater management in tropical islands: the Mayotte example

The recent evolution of the coastal environment is characterized by an increase of human potential impacts: coastal zone is located at the cross-road of sectoral issues which give rise to a number of often competing uses. Today, the main challenges in the coastal environment management are not derived from “technical problems” but correspond to the global coastal management and to the means to harmonize the different uses. This new approach has generated the need to apply systemic concepts which are able to describe and analyze large and complex systems. In the coastal zone — and especially in sensitive environments such as tropical island surrounded by coral reefs, lagoons or boat channels — one of the major challenges is to conciliate the waste waters and pipe outfalls management and the ecological preservation. The paper presents the results which have been obtained with a global approach for the definition of a sustainable wastewater management strategy in highly sensitive coastal areas located in Mayotte, (Comoros archip, Indian Ocean). This example allows to explain and identify the necessary tools and essential procedures as hydrodynamic modelling or public participation. From this application, a procedure for a coastal environment assessment procedure is formulated and proposed.     

Institutional capacity-building for targeting sea-level rise in the climate adaptation of Swedish coastal zone management. Lessons from Coastby

For coastal areas across the world, sea-level rise and problems of coastal erosion and coastal flooding are expected to increase over the next hundred years. At the same time political pressure for continued waterfront planning and development of coastal areas threatens to increase our societal vulnerability, and necessitating climate adaptation in coastal zone management. The institutional dimension has been identified as important for ensuring a more robust adaptation to both current climate variability and future climate change. In this paper, lessons regarding institutional constraints for climate adaptation are drawn from a Swedish case-study on local coastal zone management, illustrating the diverse and complex nature of institutional capacity-building. The aim of the paper is to illustrate critical factors that from an institutional perspective condition the capacity to achieve a more integrated, strategic and proactive climate adaptation and for turning “rules on paper” to working practice, based on case-study experiences from Coastby. Following and expanding a framework for analysing institutional capacity-building we learnt that a selective few key actors had played a critical role in building a strong external networking capacity with a flip-side in terms of a weak internal coordinating capacity and lack of mutual ownership of coastal erosion between sectoral units e.g. risk-management, planning and environment. We also found a weak vertical administrative interplay and lack of formal coherent policy, procedures and regulations for managing coastal erosion between local, regional and national administrations. Further, tensions and trade-offs between policy-agendas, values and political priorities posed a barrier for capacity-building in coastal zone management which calls for processes to mediate conflicting priorities in policy-making, planning and decision-making. The case-study suggests that the ability of the political administrative system to acknowledge and deal with institutional conflicts is a critical condition for ensuring an integrated and proactive climate adaptation in coastal zone management.     

基于管治理念的区域海岸带综合管理模式探究

海岸带综合管理(Integrated Coastal Zone Management,即ICZM)是一种能够协调多方利益冲突,并以实现海岸带资源配置最优化和公共利益最大化为目标的管理方法。以区域海岸带综合管理模式为研究对象,在分析地方海岸带综合管理存在问题的基础上,通过对西方管治理念的引介,构建了一个强调协调和融合的区域海岸带综合管理新模式,并对该模式的组织构成、管理计划的制定、冲突的解决、计划的实施和反馈以及管理模式有效运作的保障机制作了系统的阐述,以期推动海岸带地区的可持续发展。     

Thermal Stratification in Saldanha Bay (South Africa) and Subtidal, Density-driven Exchange with the Coastal Waters of the Benguela Upwelling System

A study was conducted to understand the mechanisms driving observed subtidal variability in the stratification of Saldanha Bay, located in the southern Benguela system. It was found that the 6–8 day period variability in bay stratification was caused by the inflow and outflow of cold upwelled water driven by changing baroclinic pressure gradients between the coastal and bay domains. The direction and magnitude of the pressure gradients were governed by coastal upwelling activity and a lag in the response of the bay to changes in density structure in the coastal ocean. When the pressure gradients were bayward and cold water was being driven into the bay the cycle was termed to be in an ‘ active phase ’ and the reverse was termed the ‘ relaxation phase ’. The upwelling-favourable equatorward wind stress impacted the bay stratification in two ways: on the regional scale, wind drives upwelling and governs the inflow–outflow of cold upwelled bottom water, which strengthens stratification; conversely, on the local bay scale, wind drives vertical mixing, which weakens stratification. A four-phase model is used to describe the observed variability in stratification in the bay. The associated density-driven exchange flows are capable of flushing the bay in 6–8 days, about one-third of the time for tidal exchange alone (c. 25 days). These inflows of cold bottom water are ecologically critical as they supply nutrients to the bay and thus impose a control on new production within the bay environment. Further ecological implications of this bay–ocean exchange include export of phytoplankton new production to the coast, limitation of the risk of harmful algal blooms (HABs) and the division of the system into two distinct ecosystems (bay and lagoon).     

Marine biodiversity conservation based on integrated coastal zone management (ICZM)—A case study in Quanzhou Bay,Fujian, China

Marine biodiversity conservation is a common issue in the world. Due to rapid economic development in coastal area in China, marine biodiversity conservation faces great pressure. In this paper, the idea of the integrated coastal zone management (ICZM) was applied as a framework in marine biodiversity conservation. At first, the relationship between integrated coastal zone management and the marine biodiversity conservation was discussed. Then, as a case study in Fujian Quanzhou bay, a set of strategies on marine biodiversity conservation based on ICZM were put forward, which included how to define management boundary of marine biodiversity conservation, the impact assessment model of human activities in the coastal area on marine biodiversity, the planning and management of marine biodiversity conservation, and the monitoring system of the marine biodiversity. Finally, the framework of the comprehensive decision support system based on GIS was suggested.     

In search of appropriate approaches to coastal zone management in Indonesia

Reforms within the Indonesian political system, following the fall of the Soeharto regime in 1998, have led to some fundamental changes in the structure of government and civil administration. Two new laws, Law No. 22/1999 on Regional Government (Decentralization Law) and Law No. 25/1999 on the Fiscal Balance between the Central Government and the Regions (Fiscal Decentralization Law), which have already been revised with the enactment of laws 32/2004 and 33/2004 promote a reconsideration of community-based approaches to coastal zone management. These laws also provide new opportunities for institutionalization of local values and community institution to manage coastal resources. This paper examines community-based and co-management approaches in coastal zone management in Indonesia. It is argued that co-management is an appropriate approach in managing Indonesian coastal zone as it allows for the development of a model containing a balance of power between governments, communities as whole and a wide range of individual stakeholders.     

Landscape-scale analysis of ecosystem risk and returns: A new tool for ICZM

Management of the coastal zone often focuses on “islands” of high value ecosystems, in terms of economic value or conservation. However, integrated management requires landscape-level analysis of all ecosystem values. The biodiversity portfolio analysis (BPA) method is derived from the logic used in share (equity) portfolio management in terms of balancing within a portfolio the returns with the risks. Optimising the returns from a share portfolio, or a suite of ecosystems in a landscape, is dependent on the relationship between the units in terms of risk and return. Three case studies are then presented to test the applicability of the BPA method at the international (North West Europe), regional (Durham Heritage Coast, UK) and local (part of South Uist, Outer Hebrides, UK) spatial scale. The Biodiversity Portfolio Analysis for NW Europe showed that risk and return were highly correlated in the studied Member States. The ranking of risk and return, with the highest first, was Ireland > UK > France=Netherlands > Belgium. For these Member States the risks to ecosystem service provision were positively correlated with GNI (r=0.97, P<0.01); suggesting that the higher the economic importance of coastal and marine resources in a Member State the more at risk the resources are. The regional and local case studies were more focussed on providing information on which to base Integrated Coastal Zone Management (ICZM) decision making; both case studies used stakeholder participation to determine risks and returns. The conclusions from these two case studies show how the BPA method can be useful in terms of setting ICZM priorities and in addressing local coastal issues. The BPA involves making a number of assumptions, however, it does provide coastal managers with a potential tool to strategically plan due to increased awareness of the interaction between the ecosystems in the portfolio.There is a need for such techniques, which involve stakeholder participation and which create objective outcomes, to support the implementation of ICZM.     

Impact of coastal engineering constructions on the topographic and morphological evolution of Quanzhou Bay, Fujian, China

A series of port constructions and large-scale reclamation projects have been extensively carried out in Quanzhou Bay to pursue social and economic benefits. These projects have changed the natural topographical and morphological evolution since 1970. In this research, from comparison of topographical and morphological characteristics of the study area in 2008, 1972 and 1934, the obvious differences between two evolution stages (1934-1972 and 1972-2008) were analyzed, and the impact of coastal engineering constructions on the evolution of topography and morphology was evaluated quantitatively. The results show that evolution before the 1970s was characterized as a stable whole with local erosion in the channel and slow aggradation of the shoal and that the morphology was dominated by natural processes, as there was little coastal engineering construction before 1970. Since the 1970s, because of a series of engineering projects such as those reclaiming land and constructing ports, the bay has been in a stage of continuous silting, characterized by the channel narrowing and shrinking and shoal silting and expanding, which may result in the abandonment of ports around the bay and endanger the salt field, aquaculture and other agriculture. Potential solutions for the management of the coastal zone of Quanzhou Bay and other similar bays by state and local agencies are suggested, such as calling for the attention of the state and local government, strengthening coastal zone management, scientific planning and reasonable exploitation, and in particular, changing the utilization of the sea area.     

Assessment of coastal management options by means of multilayered ecosystem models

This paper presents a multilayered ecosystem modelling approach that combines the simulation of the biogeochemistry of a coastal ecosystem with the simulation of the main forcing functions, such as catchment loading and aquaculture activities. This approach was developed as a tool for sustainable management of coastal ecosystems. A key feature is to simulate management scenarios that account for changes in multiple uses and enable assessment of cumulative impacts of coastal activities. The model was applied to a coastal zone in China with large aquaculture production and multiple catchment uses, and where management efforts to improve water quality are under way. Development scenarios designed in conjunction with local managers and aquaculture producers include the reduction of fish cages and treatment of wastewater. Despite the reduction in nutrient loading simulated in three different scenarios, inorganic nutrient concentrations in the bay were predicted to exceed the thresholds for poor quality defined by Chinese seawater quality legislation. For all scenarios there is still a Moderate High to High nutrient loading from the catchment, so further reductions might be enacted, together with additional decreases in fish cage culture. The model predicts that overall, shellfish production decreases by 10%–28% using any of these development scenarios, principally because shellfish growth is being sustained by the substances to be reduced for improvement of water quality. The model outcomes indicate that this may be counteracted by zoning of shellfish aquaculture at the ecosystem level in order to optimize trade-offs between productivity and environmental effects. The present case study exemplifies the value of multilayered ecosystem modelling as a tool for Integrated Coastal Zone Management and for the adoption of ecosystem approaches for marine resource management. This modelling approach can be applied worldwide, and may be particularly useful for the application of coastal management regulation, for instance in the implementation of the European Marine Strategy Framework Directive.     

Annual variation of methane in seawater in Funka bay,Japan

The concentration of methane in seawater was determined approximately once a month for one year from August 1990 to July 1991 at a station close to the center of Funka bay (92 m depth) and some supplementary observations were also carried out. The concentration of methane was usually increased with increasing depth, suggesting that methane was emitted from the bottom of the bay. While highly variable both spatially and temporally, the emission was intense in March and April, a period immediately after the spring bloom of phytoplankton. The maximum of methane found in the intermediate water suggests its source from the slope of the bay. The concentration of methane in the surface water changed seasonally and also interannually. The annually averaged flux of methane transferred to the atmosphere in the bay was estimated to be 6×10^–3 gCH₄m²/day. The coastal zone in the world may be a significant source of the atmospheric methane, although its source strength has yet to be accurately estimated from more data in different coastal seas.     

Combining process and output indicators to evaluate participation and sustainability in integrated coastal zone management projects

Integrated coastal zone management has evolved in practice and in the literature to implicate and advocate for public participation. Public participation has been proposed to open debate, contribute to policy formulation, increase government accountability, build support for agency programs, reduce community tensions and increase the sustainability of the actions. This study analysed the success of three integrated coastal zone management projects based on 8 process and output indicators. Public participation does not seem to have had an impact on the overall project objective nor on the sustainability indicators. These results bring us back to the initial concept of ICZM based on horizontal and vertical integration, and suggest that projects promoting ICZM need to be adapted to each specific cultural and political context. Long-term sustainability and natural resource management will only be achieved when the projects and activities are adapted to meet the reality on the field.     

Coastal and marine resource use conflicts and sustainable development in Tanzania

A survey of coastal and marine resource use conflicts in Tanzania was carried out to highlight them, investigate their origin and finally, suggest ways of minimizing them. Although Tanzania is putting emphasis on environmental issues, including coastal zone management, integrated coastal area management has not yet been integrated into the government management structure/approach. Many conflicts are the result of sectoral approach to coastal and marine resources management, and improper or poor implementation of government policies. Additionally, the local coastal community, who are the foremost stakeholder, were most often not involved in the planning, decision and implementation of many projects and policies even those that affect them directly. Ignorance about the linkages of coastal and marine ecosystems and resources is also an important factor. I suggest that integrated coastal area management which is the foundation for sustainable development, as far as coastal and marine resources are concerned, should be integrated into the government administrative structure. A lead agency with full authority on all activities on the coastal area, including issuance of permits for environmental sensitive businesses/activities, should be nominated or established. This will reduce conflicts by bringing about national coordination of coastal area management.     

Marine disaster prevention and integrated coastal zone management

1 MAJN CHARAcrERISTICS OF MARINE DISA5TEROwing to marine natural environment anomaly and imense changr, alI those disastersthat cause Peoples life and propedy loss over the sea aod coast area are called marinedisasters. China is a country with big sea area, of coast line l8000 km length, precinctsea area 3,000,000 km', more than 6500 islands bigger than 500 m2 with coast line of allislands 14000 km length. The Pacific Ocean is ocean with the most frequent marine disasters,further…     

Community-based governance of coastal zone and marine resources in Madagascar

On account of the “legal transplant” of French civil law into traditional customary law in Madagascar, the traditional social code generally known as “Dina” has coexisted with the modern law since the pre-colonial era and has conditioned the implementation of such law. The concept and use of Dina has been influenced by that process.This paper illustrates the role of Dina as a mechanism for reconciling modern decentralized and traditional governance of marine resources and the coastal zones in Madagascar. Democratic participation is important for enforcing the regulations governing marine resources and coastal zones. As law should be the will of people themselves, it is therefore necessary to develop legislation in community forum such as through Dina. It is especially critical that regulations be imbued with community aspiration and culture so that the population can respect laws freely.The three cases cited in this paper illustrate the different ways in which Dina may be used depending on the interests of the actors. Integrating the ‘legal’ and the ‘legitimate’ is a big challenge. In some cases, this legal mechanism is not successful at protecting local community or fishermen rights. Given the potential for integrated coastal zone management and community-based management, Dina may be strengthened in order to more effectively protect local people's rights.     

滨海旅游开发与保护的研究

滨海旅游业在带来巨大的经济利益的同时，对沿海地区的环境具有一定的负面作用。区域海岸带综合管理规划是解决滨海旅游业的开发与环境保护矛盾的有效方法。按照综合管理的原则在对海岸带地区资源承载力和生态承载力做出估计后确定其环境容量及旅游容量，在保证国家宏观调控和地区优先发展方向的大前提下，做出滨海旅游可能的最优发展规划，最终应在地区性法规体现以保证实施。同时旅游业行业管理条例中同样应做出规定，提倡生态旅游，真正地实现海岸带和旅游业的可持续性发展。     

Coastal management in Brazil – A political riddle

Brazilian legislation defines coastal zone as a national patrimony – the geographic space of interaction of air, sea and land formed by the counties directly influenced, but not necessarily by those located in the coastline; also included are those distant until 50 km from the coastline, holding activities of great impact for the coastal zone or its ecosystems. The definition includes also the territorial sea of 12 nautical miles. Coastal management is conducted by a national plan legally enforced, complemented by states and counties plans, and a coastal ecologic-economic zoning limited to small portions of the coastal zone. A resolution of the “Environmental National Council” defines as “permanent preservation areas”, of very restricted use, coastal ecosystems as mangroves, sand dunes, and reproduction sites of wild fauna. One could expect that the Brazilian coast should be more protected and properly managed than other countries where a national management plan is lacking (Argentina) or where the guidelines exist but are not yet legally enforced (South Africa). Notwithstanding, we note today in Brazil an intensification of conflicts opposing small-scale vs. industrial fishermen; shrimp farming vs. mangrove crab harvesting; resorts installation vs. native communities; oil and gas activities vs. NGOs; and conflicts on environmental permit between federal and state governmental agencies. This paper evaluates the possible reasons for the failure of the complex legal suite available in Brazil and suggests that participatory management and concerted actions with relevant stakeholders are the key elements for the successful cases.     

Diversifying fisheries into tourism in Taiwan: Experiences and prospects

Tourism is accepted as natural part of the socioeconomic fabric and is juxtaposed with fisheries in some coastal areas in Taiwan. This is the result of governmental policy on diversifying fisheries into tourism. This paper examines how this policy plays out in the context of a declining offshore fisheries industry and a rising demand for marine leisure opportunities. The paper utilizes documentary analysis and personal interviews with relevant stakeholders. It shows diversifying fisheries into tourism is the right direction for progress on the government agenda. However, conflicts between resource users, lack of community capacity, fisher’s business skills, and human resources in local governments, and low market penetration combined together to militate against the success of the policy. It argues for the need to establish negotiation mechanisms, build community capacity, encourage education and training programs, and introduce new coastal economic activities for future improvement. The paper finally suggests a holistic approach with integrated coastal management practices for the fisheries diversification development.     

Coral reef management in Belize: an approach through integrated coastal zone management

Belize has one of the most extensive reef ecosystems in the Western Hemisphere, comprising one of the largest barrier reefs in the world, three atolls and a complex network of inshore reefs. Until recently, the main impacts were probably from natural events such as hurricanes. However, anthropogenic threats such as sedimentation, agrochemical run-off, coastal development, tourism and overfishing are now of concern. To limit these impacts, Belize is taking the approach of integrated coastal zone management. The programme is building on the existing legislative framework and involves the development of an appropriate institutional structure to co-ordinate management activities in the coastal zone. A Coastal Zone Management Plan is being prepared, which will include many measures that will directly benefit the reefs: a zoning scheme for the coastal zone, incorporating protected areas; legislation and policy guidelines; research and monitoring programmes; education and public awareness campaigns; measures for community participation; and a financial sustainability mechanism.     

Extreme storms in 2006–2007 on Shikotan Island and their impact on the coastal relief and deposits

This paper describes the results of investigations of the consequences of the storms on the Pacific coast of Shikotan Island that occurred on October 7–10, 2006 and January 6–8, 2007. These storms and their impact on the coastal zone can be considered as extreme events for the last 40–50 years. The heights and flooding area of the storm surges within bay coasts of different types were measured. The coastal relief’s changes are described. During the storms, a cover of deposits was formed having a size of up to 30 m outside the beach zone and up to 52 m in the near-mouth zones. The grain-size composition of the storm deposits is analyzed and their difference from other coastal facies, including tsunami sands, are established.