Journal
JOURNAL OF HYDROLOGIC ENGINEERING
Volume 14, Issue 6, Pages 575-587Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)HE.1943-5584.0000024
Keywords
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Funding
- Climate Change Action Fund [A946]
- OURANOS
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In some parts of the world, watersheds are experiencing changes in land cover that affect their hydrological regime. This paper presents a methodology to assess the potential hydrological response of the Chaudiere River watershed (Quebec) to historical land cover changes. The objectives of this study are: (1) to determine acceptable and plausible land cover scenarios for the past 30 years based on spatial scenario intercomparison and land cover evolution analyses; and (2) to assess the influence of land cover changes on the hydrological regime of the watershed. Historical land cover changes were assessed from seven optical satellite images using an object-oriented approach. Each scenario was entered into GIBSI, an integrated modeling system. Hydrological simulations showed strong correlations between land cover changes and water discharge at the outlet of the watershed. Results demonstrated a homogeneous effect of land cover on annual runoff. Simulated annual and seasonal low flows were also strongly correlated to agricultural and forested land cover changes. Globally, results corroborate that land cover constitutes a governing factor of watershed hydrology in the Chaudiere River watershed.
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