Geomorphic histories for river and catchment management

Area of Science:

• Environmental Science
• Hydrology
• Ecology

Background:

• River and catchment management aims to transition from undesirable states to defined targets.
• Target states are typically based on community values, economic factors, and ecosystem functions.
• Disturbed catchments require historical context to define an 'existence space' of past natural states.

Purpose of the Study:

• To review quantitative differences between pre- and post-disturbance river states.
• To investigate the presence and implications of natural equilibrium states.
• To assess the utility of historical ecological data for catchment management, particularly concerning erosion and sediment transport.

Main Methods:

• Literature review of quantitative data on pre- and post-disturbance river conditions.
• Analysis of historical records to identify natural equilibrium states.
• Focus on erosion and sediment transport dynamics.

Main Results:

• Significant quantitative differences exist between natural and disturbed river states.
• The concept of natural equilibrium states in rivers is complex and requires careful consideration.
• Historical data provides crucial insights into past conditions for setting realistic management targets.

Conclusions:

• Understanding past natural states, especially regarding erosion and sediment transport, is vital for effective river and catchment management.
• Defining appropriate management targets necessitates a thorough evaluation of historical ecological data and the concept of equilibrium.
• The study highlights the importance of quantitative historical data for guiding restoration and management strategies.