This work is designed to broaden the scope with which many people regard
a river. Rivers are commonly regarded from a very simplistic perspective
as conduits for downstream flows of water. In this context, it may be
considered acceptable and necessary to engineer the channel to either
facilitate such flows (e.g., channelization, levees) or limit flows and
store water (e.g., water supply reservoirs, flood control). The book
presents the concept of a river as a spatially and temporally complex
ecosystem that is likely to be disrupted in unexpected and damaging ways
by direct river engineering and by human activities throughout a
drainage basin.
Viewing a river as a complex ecosystem with nonlinear responses to human
activities will help to promote a more nuanced and effective approach to
managing river ecosystems and to sustaining the water resources that
derive from rivers. In this context, water resources refers to ecosystem
services including water supply, water quality, flood control, erosion
control, and riverine biota (e.g., freshwater fisheries). Chapters in
this book draw extensively on existing literature but integrate this
literature from a fresh perspective. General principles are expanded
upon and illustrated with photographs, line drawings, tables, and brief,
site-specific case studies from rivers around the world.