Hydroclimatology of the PNW and the Columbia River Basin - PowerPoint PPT Presentation

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Hydroclimatology of the PNW and the Columbia River Basin

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Orography. Snowmelt. Evapotranspiration. Runoff. Groundwater. Vegetation. Water Resources ... Observed Variability of Columbia Basin Streamflow Associated with ... – PowerPoint PPT presentation

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Title: Hydroclimatology of the PNW and the Columbia River Basin


1
Hydroclimatology of the PNW and the Columbia
River Basin JISAO Climate Impacts Group Nate
Mantua Alan F. Hamlet Dennis P. Lettenmaier
2
Climate
Hydrology
Water Resources
3
Wind
Rl
Precip
Temp
Rs
Climate
SST
4
Snowmelt
Hydrology
Evapotranspiration
Orography
Vegetation
Runoff
Groundwater
5
Water Resources
Recreation
Water Supply
Irrigation
Hydropower
Flood Control
Navigation
Fisheries
6
Hydrologic Sensitivities of PNW
Snowmelt-Dominated River Basins to
Meteorological Changes
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No Change
No Change
Sm. change
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No Change
Sm. change
7
Observed Variability of Columbia Basin Streamflow
Associated with PDO and ENSO
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Effects on Columbia Basin Hydrology Associated
with Interactions Between the PDO and ENSO
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Climate Patterns Associated with Extended
Low-Flow Sequences in the Columbia River
Basin Kristyn Gray Alan F. Hamlet
23
  • Definition of Extended Drought
  • For each calendar month the virgin flow at The
    Dalles must be 0.9 std deviations or more below
    the long-term mean, and not exceed that threshold
    for longer than 3 sequential months at any time
    during the sequence.
  • The sequence of low-flow must be more than 12
    months long
  • Extended Drought Sequences 1900-1997
  • Feb 1905--Jun 1906
  • Dec 1928--Feb1932
  • Oct1935--Aug1937
  • Jan1944--Aug1945
  • Jun1987--Sep1988
  • May1992--Oct1995

24
1944-1945
1905-1906
1987-1988
1928-1932
1936-1937
1992-1995
25
  • Climate Statistics for Extended Droughts
  • 5 out of 6 are in PDO Positive Epochs
  • 4 out of 6 contain multiple El Nino events
  • 3 out of 6 contain back-to-back El Nino events
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