Coupled modelling of soil thaw/freeze dynamics and runoff generation in permafrost landscapes, Upper Kolyma, Russia - PowerPoint PPT Presentation

Loading...

PPT – Coupled modelling of soil thaw/freeze dynamics and runoff generation in permafrost landscapes, Upper Kolyma, Russia PowerPoint presentation | free to download - id: 4490e3-ZGUxO



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Coupled modelling of soil thaw/freeze dynamics and runoff generation in permafrost landscapes, Upper Kolyma, Russia

Description:

Coupled modelling of soil thaw/freeze dynamics and runoff generation in permafrost landscapes, Upper Kolyma, Russia Lebedeva L.1,4, Semenova O.2,3 – PowerPoint PPT presentation

Number of Views:39
Avg rating:3.0/5.0
Slides: 17
Provided by: MILA49
Learn more at: http://www.hydrograph-model.ru
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Coupled modelling of soil thaw/freeze dynamics and runoff generation in permafrost landscapes, Upper Kolyma, Russia


1
Coupled modelling of soil thaw/freeze dynamics
and runoff generation in permafrost landscapes,
Upper Kolyma, Russia
  • Lebedeva L.1,4, Semenova O.2,3
  • 1Nansen Environmental and Remote Sensing Centre
  • 2Gidrotehproekt Ltd
  • 3St. Petersburg State University
  • 4State Hydrological Institute
  • St. Petersburg, Russia

The study is partially supported by
Russian-German Otto Schmidt Laboratory for Polar
and Marine research
2
Variety of landscapes and complex process
interactions
  • Bare rocks

Bush tundra
Deep active layer Subsurface runoff
Shallow active layer, surface runoff
Larch forest
Riparian vegetation
www.hydrograph-model.ru
3
Motivation
  • variety of landscapes and dominated flow
    formation mechanisms
  • sparse hydrometeorological network in
    North-Eastern Russia and nearly absence of
    research stations
  • observed environmental changes impact differently
    in diverse landscapes
  • - analysis of active layer formation and flow
    generation mechanisms in mountainous permafrost
    landscapes of the Kolyma Water Balance Station
    (North-Eastern Russia)
  • - simulate thaw/freeze depths and runoff in
    homogenious landscape typical for North-Eastern
    Russia using the Hydrograph model
  • - develop and verify unified approach for
    hydrological modelling in changing permafrost
    environments of North-East of Russia

Objectives
4
Study area Kolyma water-balance station
Creek Area, km2 Average (and maximum) elevation, m Average (and maximum) slope, º Area occupied by a certain landscape, Area occupied by a certain landscape, Area occupied by a certain landscape, Area occupied by a certain landscape,
Creek Area, km2 Average (and maximum) elevation, m Average (and maximum) slope, º Rocky talus Mountain tundra Sparse trees Forest and bogs
Morozova 0.63 1370 (1700) 33 (50) 98 2 0 0
Severny 0.33 1020 (1300) 21 (40) 24 63 0 13
Yuzhny 0.27 985 (1100) 17 (30) 5 17 56 22
Kontaktovy 21.2 1070 (1700) 25 (50) 34 27 12 27
  • Mean air temperature is -11,40?
  • Mean annual precipitation 320 mm
  • Elevation ranges 800-1700 m
  • Variety of landscapes
  • Continuous permafrost with the thickness up to
    400 m
  • Representative for the vast territories of Upper
    Kolyma River Basin

5
List of measurements conducted at KWBS
6
Scheme of the typical landscapes
Bush tundra
Bare rocks
Sparse forest
Larch forest
7
The Hydrograph model
  • Process-based (explicitly includes all processes)
  • Observable parameters, no calibration (can be
    obtained apriori)
  • Common input daily data (air temperature and
    moisture, precipitation)
  • Free of scale problem (from soil column to large
    basin)

initially developed by Prof. Yury Vinogradov
www.hydrograph-model.ru
8
Physical ground properties that drive the
processes of active layer formation
Moss and lichen Peat Clay with inclusion of rocks Bedrock
Density, kg/m3 500 1720 2610 2610
Porosity, 90 80 55 35
Water holding capacity, 60 20-40 13 7
Infiltration coefficient, mm/min 10 0.0005-0.5 0.0005 0.05-1
Heat capacity, J/(kg oC) 1930 1930 840 750
Heat conductivity, W/(m oC) 0.8 0.8 1.2 1.5
Wilting point, 8 6-8 4 2-3
www.hydrograph-model.ru
9
Soil thaw/freeze processes and runoff
formationType 1 peaty soils and surface flow
Peaty soil is fully saturated with ice during
snow melt. It thaws slowly and surface flow
occurs.
10
Soil thaw/freeze processes and runoff
formationType 2 rocky stratum and subsurface
flow
Snowmelt water is re-frozen in soil. Only
subsurface flow is formed.
liquid water content in soil ice content in
soil simulated soil thaw depth
observed runoff simulated runoff snow water
equivalent
11
Stages of the soil thawing and spring flow
formation (Bantsekina, 2003)
flow dependence on air temperature
  • Data of ice content in the rocky stratum dont
    exist. According to literature each year in
    freshet period 40-60 mm ground ice are formed.
    Modelling results for 1969-1990 show 21-48 mm.

12
Observed and simulated thawing depths in bare
rocks, bush tundra and larch forest, 1962
Bare rocks
Bush tundra
Larch forest
13
Runoff modelling at slope scale
Yuzny Creek, area 0.27 km2 , sparse forest
1980 NS 0.74
Severny Creek, area 0.33 km2, bush tundra
1978 NS 0.86
1 observed runoff, 2 simulated runoff, 3 -
precipitation
www.hydrograph-model.ru
14
Runoff modelling at slope and small scale
Morozova Creek area 0.63 km2, bare rocks
1979 NS 0.79
Kontaktovy Creek, 21.2 km2, 1978, m3/s
1978 NS 0.85
Landscape distribution Bare rock 32 Bush
tundra 29 Sparse forest 21 Larch forest
18
1 observed runoff, 2 simulated runoff, 3 -
precipitation
15
Conclusions
  • Hydrograph model proved its capability to
    successfully describe soil thawing and freezing,
    water and ice dynamics in rocky stratum in
    diverse landscapes based on relatively simple
    algorithms and observable parameters.
  • Good agreement between observed and simulated
    active layer depth and runoff is achieved for
    small watersheds of the KWBS
  • Developed set of model parameters which are
    systematized according to main landscapes of the
    Upper Kolyma River basin might be transferred to
    other basins without specific observations

www.hydrograph-model.ru
Semenova O., Lebedeva L., Vinogradov Yu., 2013
Simulation of subsurface heat and water dynamics,
and runoff generation in mountainous permafrost
conditions, in the Upper Kolyma River basin,
Russia. Hydrogeology Journal vol. 21, iss. 1, 107
119. DOI10.1007/s10040-012-0936-1
www.hydrograph-model.ru
16
  • Thank you for attention
About PowerShow.com