2. River Hydrology short - Sunshine Coast Elder College · 2018-04-03 · Charlton 2008,...
Transcript of 2. River Hydrology short - Sunshine Coast Elder College · 2018-04-03 · Charlton 2008,...
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2. River HydrologyRivers are part of the global hydrologic cycle
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Contributions to streamflow
Charlton 2008, Fundamentals of Fluvial Geomorphology
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Hortonian overland flow (surface runoff)
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Saturation overland flow (surface runoff)
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Through flow (sub-surface runoff)
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Groundwater flow
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Measuring Streamflowdischarge: volume of water [cubic metres] passing through a cross-section of a river per unit time [seconds]:
discharge [m3/s or cms] = mean flow velocity [m/s] times cross-sectional area [m2]
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Charlton 2008, Fundamentals of Fluvial Geomorphology
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modern measurements of discharge use acoustic Doppler current profilers (aDcp)
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Hydrographs
hydrograph: a plot of discharge over time
Dis
char
ge (
cms)
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• quick flow: water that enters the channel quickly by overland flow and through flow
• base flow: water that enters the channel slowly by groundwater flow
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Charlton 2008, Fundamentals of Fluvial Geomorphology
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Floods
causes: rain storms and/or snowmelt, ice-jams, dam failures
importance: control sediment movement and channel morphology, damage infrastructure, cause fatalities
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Nadi
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Tom River
Ob
Rive
r
Tomsk
10 km
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Global Discharge
river ranking by average daily discharge