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Streamflow Regime and Changes in Large Northern Watersheds: Human Impacts vs. Natural Variations Daqing Yang, Douglas Kane Water and Environment Research.

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Presentation on theme: "Streamflow Regime and Changes in Large Northern Watersheds: Human Impacts vs. Natural Variations Daqing Yang, Douglas Kane Water and Environment Research."— Presentation transcript:

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2 Streamflow Regime and Changes in Large Northern Watersheds: Human Impacts vs. Natural Variations Daqing Yang, Douglas Kane Water and Environment Research Center University of Alaska Fairbanks, AK99775 Baisheng Ye Cold & Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, P. R. China

3 A F E D C H G I J K M L N B A Reservoir

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5 Monthly discharge (m3/s) Lena river, 1935-94 Yenisei river, 1936- 1995 Ob river, 1930-94 Monthly flow regime and change

6 Comparisons of long-term daily mean discharge (m3/s)

7 Annual discharge and trend for Ob, Yenisei & Lena rivers, 1930-95

8 Annual precipitation and trend in large Siberian basins, 1935-98

9 Vilui reservoir, operated in 1967, max. capacity 35.9km 3, 7% Lena River total runoff E F D A B C H Aldan tributary Area ----28.6% Runoff ---- 30% Data ---1942-1990 Upper Lena basin Area ----36.9% Runoff --- 42% Data ---1936-1990 Vilui basin Area ---18.6% Runoff ---- 9% Data ---1936-1990 LENA – KUSUR Area ----2,430,000km 2 Runoff ---523.9km 3 Data ---1939-1994 G

10 Monthly discharge (m3/s) Reservoir Effect on Streamflow

11 Monthly mean discharge for pre-dam (1942-67) and post-dam (1968-90) periods at the 4 stations Monthly discharge (m3/s)

12 Mean stream temperatures, predam (1950-67) vs. postdam (1968- 92) periods, Suntar station. June discharge and June 20 stream temperature, Suntar station. Dam Impact on Water Temp:

13 Monthly discharge trends for major sub-basins and at Lena basin outlet

14 Reconstruction of monthly discharge at basin outlet Regression functions between upstream and downstream Q: June: Q outlet = 0.315+3.315Q 1 +0.813Q 2 May: Q outlet = 660.8e 0.0002Q 2

15 Comparison between the observed and reconstructed monthly discharge at Lena basin outlet / Kusur station Reconstructed discharge (m3/s) Observed discharge (m3/s)

16 Comparison between observed and reconstructed monthly discharge at the Lena basin outlet, 1942-90 Monthly discharge (m3/s)

17 Comparison of observed vs. reconstructed mean flows at Kusur station

18 Comparisons of annual discharge and its trend, observed vs. reconstructed, Lena basin outlet

19 A F E D C H G I J K M L N B A Reservoir

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