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Streamflow Regime and Changes in Large Northern Watersheds

This study examines streamflow changes in major Siberian rivers from 1930 to 1995, assessing the impacts of human activities and natural variations on water regimes in the Lena, Yenisei, and Ob River basins. Detailed analyses compare historical discharge data, reservoir effects on streamflow, and dam impacts on water temperature, providing valuable insights into long-term hydrological trends.

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Streamflow Regime and Changes in Large Northern Watersheds

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  1. 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

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

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

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

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

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

  7. LENA – KUSUR Area ----2,430,000km2 Runoff ---523.9km3 Data ---1939-1994 A H G D B E Aldan tributary Area ----28.6% Runoff ---- 30% Data ---1942-1990 F Vilui reservoir, operated in 1967, max. capacity 35.9km3, 7% Lena River total runoff C Vilui basin Area ---18.6% Runoff ---- 9% Data ---1936-1990 Upper Lena basin Area ----36.9% Runoff --- 42% Data ---1936-1990

  8. Monthly discharge (m3/s) Reservoir Effect on Streamflow

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

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

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

  12. Reconstruction of monthly discharge at basin outlet Regression functions between upstream and downstream Q: June: Qoutlet = 0.315+3.315Q1+0.813Q2 May: Qoutlet = 660.8e0.0002Q2

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

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

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

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

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

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