Yr 10 Geo case study

Geographical definitions and terminology

• Enviromental issue: is a natural or human induced problem that disrupts ecosystems by altering enviromental conditions and affecting plants, animals, and human communities

• Salt water intrusion: the process where sea water moves into freshwater environment increasing salinity and changing water quality, soil conditions and ecosystem health

• Mitigation: actions taken to reduce the severity or impacts of environmental problems to help protect ecosystems from further damage

• Location and background 

• Kakadu national park, Northern territory

• UNESCO world heritage site

• Biodiverse wetland and flood plains

• Managed by traditional owners

• Environmental issue

• Salt water intrusion happens when salt water moves into freshwater environments increasing salinity, changing water quality, soil conditions and ecosystem health

• In kakadu tidal sea water travels upstream into freshwater environments

• The increased salinity in the water changes soil and water chemistry fresh water plants like paperback trees and waters lilies cannot survive because they cant tolerate salt and prevents the plants from regrowing and new plants from growing

• Loss of vegetation reduces habitat and food sources 

• Reduce biodiversity and disrupt breeding areas

• Causes (anthropogenic) or human induced

• Climate change: long term shift in global weather patterns largely driven by increased greenhouse gas emissions (CO2, burning coal) warmer temps contribute to higher sea levels, stronger storms and changing rain patterns, which push saltwater into freshwater enviroments speeding up environmental change

• Causes (natural) 

• Rise in sea levels: global warming makes oceans warmer contribute to sea levels rising causing floods and tidal waves which push saltwater into freshwater enviroments

• Buffalo grazing damage: when the buffalos grazed on the kakadu lands they trampled it damaging vegetation and natural levee bank which previously acted as barriers against seawater. Because of this channels formed allowing seawater in leaving long lasting impacts

• Storm surges and tidal waves: occur when strong winds and low air pressure push ocean waters onto land during storms temorarily rises ocean levels and and forces seawater upstream into rivers and wetlands increases salinity and and gradually transform freshwater habitats into sea water ones

• Evidence and data  

• Sea levels:scientific monitoring shows that sea levels are rising 3-4mm per year. This is a slow continuous rise increases the likelihood of seawater moving into freshwater wetlands making long term environmental change more likely

• Wetland vegetation decline: increased salinity in fresh water environments makes it harder for fresh water plants - paper bark tree and water lilies to grow. Studies have shown that the growth of these plants have significantly declined with them growing slower or not at all

• Increasing salinity readings: environmental monitoring programs measure the salinity levels in water and soil across kakadus floodplains. Data shows that salt concentraltion levels are increasing in levels in places affected by saltwater intrusion. Confirming that freshwater ecosystems are gradually turning into more marine like ecosystems and that the change is ongoing

Environmental effects

• Loss of freshwater plants: because of the increased salinity in the water fresh water species such as paperbark trees and water lilies cannot survive in an ecosystem with high salinity levels. The salt interferes with their ability to absorb nutrients and water. Overtime the plants will die and be replaced with salt- tolerant species

• Habitat loss: when freshwater plants beging to die out it eliminates shelter, food and water for animals who rely on the vegetation. Loss of plants also can lead to soil erosions and water quality further degrading living conditions

• Biodiversity loss: As habitats decline fewer species survive in affected areas, causing species to migrate or even begin to die out. Eliminating the biodiversity of the ecosystem and making it more vulnerable to enviromental change and making it harder to recover from climate impacts

social and cultural effects

Social and cultural: 

• Food sources: Impacts on indigenous people who rely on the freshwater ecosystem to receive their food, include freshwater fish and plants. The salt water intrusion changes the environment cause species to decline reducing acess to important bush foods and affecting traditional harvesting

• Connection to land: wetlands are culturally significant landscapes that connection to stories and have traditional management strategies. Salt water intrusion changes the environment, changing the appearance and the function impacting indigenous culture and management of land

• Tourism: the national park attracts tourists because of its unique freshwater ecosystem, wildlife and cultural connection. Environment degragation and biodiversity loss causes the environment to be less attractive or accessible reducing tourism

stakeholders and their perspectives

• Traditional owners: want to protect cultural sites and food sources affected by the environmental change

• Parks Australia: manage and conserve wetlands whilst balancing visitor intake

• Scientists and researchers: want to study the ecosystem and the changes happening to it so that they can provide mitigation strategies

• Tourism operators: depend on the health and appeal of the ecosystem to attract customers

• Locals: rely on the enviroment for employment and wellbeing

management responses (local, national and global)

• Saltwater barriers 

Local

Built in kakadu wetlands to physically stop salt water from entering the fresh water floodplains

National

Supported through conservation funding by the australian government and management plans

Global

Part of climate adaptation strategies used worldwide to protect vulnerable costal ecosystems from sea level rise

• vegetation restoration

Local

Replant native plants to try and restore habitats and stabalise wetland ecosystems in kakadu

National

Aligns with australias biodiversity conservation and ecosystem restoration programs

Global

Supports international goals such as ecosystem restoration under UN environmental sustainability initiatives.

• Ranger Programs

•Local: Indigenous ranger groups manage Country using traditional ecological knowledge and on-ground conservation practices.

•National: Funded through Australian Indigenous Ranger and Caring for Country programs.

•Global: Recognises Indigenous knowledge as an important approach in global environmental management and sustainability frameworks.

• Monitoring programs

• •Local: Scientists measure salinity, vegetation health, and ecosystem change in Kakadu wetlands.

• •National: Data contributes to Australian climate research and environmental reporting.

• •Global: Monitoring supports international climate science and helps track global environmental change trends.

mitigation strategies (short-long term)

• •Short: Monitoring — Regularly measuring environmental conditions to detect changes early and guide management decisions.

• •Medium: Habitat Restoration — Rebuilding damaged ecosystems by restoring native vegetation and improving natural wetland conditions.

• •Long: Climate Adaptation Planning — Developing long-term strategies to help ecosystems and communities adjust to ongoing climate change impacts.

Evaluation of mitigation stategies

• •Successes: Wetland Recovery Areas

• •Management actions such as saltwater barriers and vegetation restoration have helped some wetlands recover, allowing freshwater plants and wildlife to return in protected areas. These efforts show that local management strategies can slow environmental damage and support ecosystem recovery.

• •Challenges: Ongoing Sea Level Rise and Costs

• •Despite local successes, rising sea levels continue to push saltwater inland, making long-term protection difficult. Management projects are also expensive and require ongoing maintenance, meaning solutions may become harder to sustain without broader action on climate change