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Synthesizing dam-induced land system change.

Philippe Rufin1,2, Florian Gollnow3, Daniel Müller4,5,6

  • 1Geography Department, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099, Berlin, Germany. philippe.rufin@geo.hu-berlin.de.

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|January 10, 2019
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Summary
This summary is machine-generated.

Dam construction significantly alters land systems, impacting forests, agriculture, and urban areas. Indirect effects, rather than just flooding, are the primary drivers of these land system changes.

Keywords:
Causal effectsCounterfactualsLand use displacementLand use intensityMeta-study

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Area of Science:

  • Environmental Science
  • Geography
  • Ecology

Background:

  • Dam construction and operation are known to modify terrestrial ecosystems and land systems.
  • Understanding the scale and nature of these modifications is crucial for environmental management.

Purpose of the Study:

  • To synthesize existing research on dam-induced land system changes.
  • To identify the primary types of land cover and land use changes associated with dams.
  • To explore the mechanisms driving these changes and potential future research directions.

Main Methods:

  • Systematic synthesis of 178 observations from 54 peer-reviewed case studies on dam-induced land system changes.
  • Categorization of land system changes by type (land cover, land use intensity) and dam type (hydropower, multi-purpose, irrigation).
  • Analysis of direct (reservoir flooding) and indirect effects on land systems.

Main Results:

  • Forests (23%), agricultural land (21%), and built-up areas (11%) frequently changed in extent due to dams.
  • Land use intensity alterations were also significant (23%), particularly from irrigation dams.
  • Indirect effects (42%) were more influential than direct reservoir flooding (29%) in driving land system changes.
  • Dam distance and time since commissioning were suggested as potential controls for change direction.

Conclusions:

  • Dam impacts on land systems are diverse, encompassing both land cover and land use intensity.
  • Indirect effects play a critical role, necessitating a holistic understanding of dam-environment interactions.
  • Future research should focus on large-scale, multi-disciplinary investigations to generalize findings on dam-induced land system modifications.