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Environmental FlowsSaving Rivers in the Third Millennium$
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Angela H. Arthington

Print publication date: 2012

Print ISBN-13: 9780520273696

Published to California Scholarship Online: May 2013

DOI: 10.1525/california/9780520273696.001.0001

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PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use.date: 16 September 2021

Global Hydrology and Climate, and River Flow Regimes

Global Hydrology and Climate, and River Flow Regimes

(p.13) 2 Global Hydrology and Climate, and River Flow Regimes
Environmental Flows

Angela H. Arthington

University of California Press

Global patterns of climatic variation provide a broad context for discussing geographic variation in river flow regimes and their classification. Climatically driven hydrologic signatures of individual rivers can be described in terms of the magnitude, frequency, seasonal timing or predictability, duration, and rate of change of hydrologic conditions. Hydrological classification plays an important role in scientifically informed water management to protect river ecosystems and sustain livelihoods. Although flow is a “master variable,” many other environmental factors modulate how a flow regime translates into habitat types, and responses of aquatic biota to habitat at various spatial and temporal scales. Geomorphic differentiation and channel network structure, substrate types, water quality, and riparian character influence the development of typical habitat structures throughout a river basin.

Keywords:   global hydrology, climatic variation, river flow regimes, seasonal timing, hydrologic classification, habitat types, other environmental factors

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