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Caspian Sea water level fluctuation: comparison between ground Measurement and altimetry

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Caspian Sea water level fluctuation: comparison between ground Measurement and altimetry M Bolgov R Mammedov J-F Crétaux M. Bergé-Nguyen A. Kouraev Destruction of a coastal zone in northern coast of Azerbaijan as a result of rise of a sea level. Caspian Sea level fluctuation problem

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slide1
Caspian Sea water level fluctuation: comparison between ground

Measurement and altimetry

M Bolgov

R Mammedov

J-F Crétaux

M. Bergé-Nguyen

A. Kouraev

slide2
Destruction of a coastal zone in northern coast of Azerbaijan as a result of rise of a sea level.
caspian sea level fluctuation problem
Caspian Sea level fluctuation problem

Peculiarities of the variability of the Caspian Sea level

The variability of the Caspian Sea level can be classified on cycles:

  • Geological period,
  • Historical period,
  • Yearly change,
  • Seasonal change.
slide4
Variability of the Caspian Sea level for historical period: 1-Historical period, 2-Average tendency its, 3-Frequency of repetition, 4-Average tendency, 5-Level maximum, 6-Level minimum.
slide5
Annual levels of the Caspian Sea measured in the Baku post.

1-measured level, 2- tendencies of changing. In the framework seasonal changing level is shown.

slide6
Reasons for changes in sea level

Geological factors

Anthropogenic factors

Hydroclimatic factors

slide8
Water mass balance estimation

The balance of water in the Caspian Sea is determined by the following contributory factors:

1) surface river flow into the sea;

2) precipitation over the surface of the sea;

3) underground flow into the sea;

4) evaporation from the surface of the sea;

5) outflow into the gulf of Kara-Bogaz-Gol.

The first three factors constitute additions to and the last two, subtractions from, the water stock of the Caspian

DV/dt = (Runoffrivers - RunoffKBG) + (Gi-Go) +(P-E)

slide13
Altimetry on the Caspian sea and Kara Bogaz Gol Gulf
  • This concerns three main components:
    • Calculation of decadal Caspian Sea and KBG level variation and comparison with in-situ measurements
    • Estimation of water mass balance of each water bodies, based on coupled altimetry-climatological data
    • Study of ice regime in the north of Caspian sea from combination of active (altimetry) and passive (radiometry) microwave data
slide14
Study of CSL from altimetry

+ Digital Bathymetry Map

slide18
Global agreement with remaining local discrepancies (70 mm

in 1995)

Errors in altimetry ~15 mm/yr

Possible uncertainty in the global lake level deduced from

terrestrial gauges to investigate

slide21
4 December 1972

29 September 1987

Change of the area of gulf Gara-Bogaz-Gol

Mamedov (1996) presents the following relationship (attributed to Sheremetievskoi):

where, QKBG = annual inflow to the KBG (km3), H = average annual sea level at Baku (cm), QC = annual inflow to the Caspian Sea (km3).

slide23
+

DV/dt = Runoff (Caspi->KBG) – (E-P)*Surface(t)

slide24
Geographycal distribution of annual

CSL variation deduced from 10 years

(1993-2002) Of Topex / Poseidon data

and average seasonal variation

Annual Amplitude (m)

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