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Introduction to Water Systems - Coggle Diagram
Introduction to Water Systems
The Role of Water in the Environment
Importance of Water
Water as a medium for life: Crucial for biological processes and ecosystems.
Key roles
Habitat for aquatic organisms
Regulator of climate through heat capacity
Agent for transporting nutrients and waste
The Hydrological Cycle (Water Cycle)
Processes in the Hydrological Cycle
Transfers
Surface runoff
Groundwater flow
Transformations
Evaporation: Liquid to gas (requires energy)
Condensation: Gas to liquid (releases energy)
Freezing/Melting: Phase changes of water
Storages in the Hydrological Cycle
Major water stores
Oceans: Largest global store (~97%).
Glaciers/Ice caps: Key freshwater reserve (~69% of freshwater).
Groundwater: Long-term freshwater storage.
Surface water: Rivers, lakes, wetlands (~1% of freshwater).
Atmosphere: Small but vital for weather and climate.
Soil Moisture and Organisms: Critical for terrestrial ecosystems.
Human Influence on the Hydrological Cycle
Urbanization
Increases surface runoff.
Reduces infiltration and groundwater recharge.
Deforestation
Reduces evapotranspiration and disrupts rainfall patterns
Agriculture
Alters soil moisture and increases irrigation demand
Dam construction
Alters river flow, disrupts natural storage and transfers
Flows of Energy and Matter in Water Systems
Energy Transfers
Energy Transfer
Solar Radiation: Drives evaporation and influences water temperature.
Kinetic Energy: Movement in rivers and streams.
Latent Heat: Released or absorbed during phase changes (e.g., evaporation, condensation)
Matter Transfer
Transport of dissolved nutrients, sediments, and pollutants in rivers and streams.
Deposition of sediments in deltas and floodplains.
Systems Approach to Water
Water system as Open System
Inputs: Precipitation, river inflows, groundwater recharge.
Outputs: Evaporation, transpiration, runoff to oceans.
Storages and Flows
Water moves between stores via natural and human-influenced processes.
Feedback Mechanisms
Positive Feedback
Example: Melting ice caps reduce albedo, causing more solar absorption and warming.
Negative Feedback
Example: Increased evaporation leads to cloud formation, reflecting sunlight and reducing temperatures.
Management of Water Resources
Issues of Water Availability
Physical Water Scarcity: Insufficient natural supply in arid regions (e.g., Middle East).
Economic Water Scarcity: Lack of access due to infrastructure or governance issues (e.g., Sub-Saharan Africa).
Sustainable Water Use
Strategies
Efficient irrigation (e.g., drip irrigation).
Rainwater harvesting and recycling.
Desalination in water-scarce regions.