The concept of integrated coastal zone management

Integrated coastal zone management (ICZM) is a comprehensive strategy for handling coastal areas. It takes a holistic view, considering all interconnected elements such as land, water, people, and economic activities, rather than focusing on isolated parts. This approach ensures that decisions account for the entire system, promoting sustainable use while addressing both immediate and long-term needs.

ICZM moves away from older methods that often dealt with local issues in isolation, which could lead to problems like increased erosion in nearby areas due to structures such as groynes disrupting sediment flow. Instead, it aims to keep the coastal zone in a relatively natural state, allowing for human development in ways that minimise harm.

Key principles of integration in ICZM

• Interdependence of land and water - Coastal environments rely on the close links between terrestrial and marine systems, so management must address both.
• Equal value of economic uses - Activities like fishing, tourism, and industry are all considered important, with plans balancing their needs.
• Involvement of multiple authority levels - Local, regional, and national bodies all contribute to decision-making, ensuring a coordinated response.

ICZM is dynamic, meaning plans are regularly reviewed and adjusted if local demands or conditions change. This flexibility helps adapt to evolving challenges like climate change or population growth.

Application of ICZM in different global contexts

ICZM strategies vary depending on a country's development status. In developing countries, the focus is often on adaptation measures, such as adjusting to erosion and flooding, because these are more cost-effective to implement with limited resources. In developed countries, strategies combine adaptation with mitigation efforts, like building defences to control natural processes, due to greater pressure from communities and available funding.

In the UK, for example, the English and Welsh coastline is divided into 11 littoral cells (large-scale units based on natural sediment movement). ICZM further breaks this into 22 smaller areas, each managed through a shoreline management plan (SMP) developed by bodies like the Environment Agency and local authorities.

The four main strategies in shoreline management plans

Shoreline management plans (SMPs) outline how specific coastal sections will be handled. They typically select one of four strategies, each with its own benefits and drawbacks. These decisions aim to balance protection, cost, and environmental impact.

No active intervention

This strategy involves building no new coastal defences, allowing natural processes like erosion and flooding to occur. Existing structures may remain but will eventually degrade.

Evaluation:

• Advantage - It is the most cost-effective option, preserving natural coastal dynamics and avoiding interference with sediment cells.
• Disadvantage - It leaves properties and land vulnerable, often leading to opposition from affected residents, and requires authorities to manage consequences reactively.

Strategic realignment

Here, the shoreline is allowed to shift inland naturally, but in a controlled way to minimise damage to high-value areas, such as directing flooding towards low-quality farmland instead of towns.

Evaluation:

• Advantage - It promotes ecological sustainability by working with natural processes and can enhance habitats over time.
• Disadvantage - It is less suitable for densely built-up areas, like much of the UK coastline, where relocation could disrupt communities.

Hold the line

This approach maintains the current shoreline position by repairing or upgrading existing defences, often using a mix of hard engineering (like sea walls) and soft engineering (like beach replenishment).

Evaluation:

• Advantage - It protects high-value land and infrastructure effectively, providing stability for economic activities.
• Disadvantage - It can be expensive, especially if original defences were flawed, and structures like concrete walls may reduce the beach's visual appeal.

Advance the line

New defences are constructed seaward of the existing shoreline, expanding the land area through methods like beach nourishment or reclamation, typically in areas with natural deposition.

Evaluation:

• Advantage - It can increase beach size, boost tourism, and create new land for development.
• Disadvantage - High costs are involved, and it requires suitable conditions like sediment availability to be effective.

Factors influencing coastal management decisions

Choosing a strategy for coastal management is complex and overseen in the UK by bodies like the Department for Environment, Food and Rural Affairs (DEFRA). The goal is to safeguard homes, businesses, and the environment from the social, economic, and environmental effects of erosion and flooding. Several key factors are weighed to ensure decisions are balanced and practical.

Main considerations in strategy selection

• Land value - Areas with high economic or use value, such as urban zones or productive farmland, are more likely to receive protective measures.
• Engineering feasibility - The local geology and coastal shape can make some defences impractical, for example, stabilising highly mobile sand dunes or unstable cliffs.
• Impact on coastal processes - Strategies must avoid disrupting sediment cells, which could cause erosion elsewhere.
• Environmental sensitivity - Options that harm valuable habitats, like wetlands or breeding grounds, are avoided, while undefended areas might protect others indirectly.
• Cultural heritage - Sites with historical or cultural significance, even without direct economic value, influence choices to preserve them for communities.
• Local opinions - Input from residents, councils, and stakeholders can sway decisions, reflecting community priorities.
• Costs - Both initial construction and long-term maintenance expenses are evaluated to ensure affordability.

In some cases, authorities opt for visible strategies, like hard engineering, to build local confidence and encourage investment, even if softer options might be more sustainable.

Tools for decision-making in coastal management

To make informed choices, authorities use analytical tools that compare options objectively. These help prioritise limited resources, especially when not all areas can be defended.

Cost-benefit analysis

Cost-benefit analysis (CBA) evaluates a strategy by comparing its economic costs against benefits, including social and environmental factors. It assigns values to intangible elements, such as biodiversity, visual appeal, or accessibility, to weigh them alongside financial aspects.

This process often favours larger settlements over smaller ones due to higher overall benefits, ensuring funds are used efficiently.

Environmental impact assessment

An environmental impact assessment (EIA) provides detailed insights into a project's effects, complementing CBA.

An EIA examines impacts on:

• Natural processes - Such as longshore drift or sediment transport.
• Species and ecosystems - Including marine plants, fish, mammals, and overall balance.
• Environmental quality - Covering potential pollution to air, water, or soil.

EIAs ensure strategies minimise harm and support sustainability.

Conflicts in coastal management

The broad scope of ICZM often leads to disagreements among stakeholders, as plans span large areas with diverse interests. This occurs in both developed and developing countries, creating perceived 'winners' and 'losers'.

Key players and their priorities

• Local residents and homeowners - Focus on protecting personal property and land from erosion or flooding.
• Local authorities - Aim to keep settlements functional, supporting businesses and infrastructure.
• Environmental pressure groups - Prioritise habitat and species conservation over development.

Winners and losers in decisions

• Winners - Groups or species that benefit, such as protected bird nesting sites on cliffs that gain stability.
• Losers - Those disadvantaged, like businesses forced to relocate, leading to job losses or economic disruption.

These conflicts highlight the challenge of balancing human needs with environmental protection.

Case study: Coastal management in Happisburgh, England

Happisburgh is a small village in North Norfolk, UK, with around 1,400 residents and 600 properties. Its coastline features boulder clay, making it prone to erosion.

Background and method

In 1996, a no active intervention policy was adopted, predicting around 200 metres of coastline loss by 2105. This risked properties, a caravan park, 45 hectares of farmland, and heritage sites like a listed church. Sea defences from the 1950s had already failed due to weathering and mass movement.

Results and evaluation

A cost-benefit analysis showed new defences would cost £15 million, exceeding the properties' value, so they were not approved. In 1998, residents formed the Coastal Concern Action Group to campaign against the policy.

North Norfolk District Council received around £3 million to:

• Buy at-risk properties at 40% value.
• Relocate facilities like the caravan site and create a buffer zone.
• Install emergency rock armour to slow erosion.

In 2022, the UK's Coastal Transition Accelerator Programme was launched to support communities like Happisburgh.

Limitations

The policy caused local dissatisfaction, as it prioritised cost over immediate protection, highlighting tensions in developed countries where residents expect mitigation.

Case study: Coastal management in Chattogram, Bangladesh

Chattogram is a coastal city in southeastern Bangladesh, vulnerable to flooding from sea-level rise and cyclone storm surges.

Background and method

Since 2013, the Coastal Climate Resilient Infrastructure Project, funded by the Asian Development Bank, has used a multi-faceted ICZM approach to build resilience for people, the economy, and the environment.

Key schemes and procedures

• Constructing embankments with halophytic vegetation (plants tolerant of salty conditions) for protection.
• Elevating and reinforcing roads to withstand storms.
• Upgrading 25 cyclone shelters (also used as schools or community centres) and improving access.
• Enhancing 37 boat landing stages to handle rising waters.
• Implementing education on cyclone response and land management.
• Improving water supply, sewage, and sanitation with flood protection.

Projects were locally managed to boost engagement.

Results and evaluation

Concerns arose over vegetation clearance, but replanting and local stewardship roles mitigated this. 346 people received compensation for resettlement.

Limitations

While effective for adaptation in a developing context, the project relied on external funding, and initial environmental disruptions showed the need for careful planning.