Bed stability as parameter describing the hydro-morphological balance of mountain river
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1 The XXXII International School of Hydraulics, May 2012, Łochów, Poland Bed stability as parameter describing Andrzej STRUŻYŃSKI 1, Mateusz STRUTYŃSKI 1 and Krzysztof KULESZA 2 1 University of Agriculture in Kraków, Department of Hydraulic Engineering and Geotechnics Mickiewicza Ave. 24/28, Kraków, Poland rmstruzy@cyf-kr.edu.pl 2 Institute of Meteorology and Water Management - National Research Institute, Board of Water-Management Systems Piotra Borowego 14, Kraków, Poland krzysztof.kulesza@imgw.pl
2 Presentation schedule: - introduction - methodology - investigated objects - bed stability - influence of bed stability on the balance h-m first attempt Financed by National Project No: 1865/B/P01/2009/37 Ocena zrównoważonego stanu rzek i potoków górskich w oparciu o naturalne warunki morfologiczne
3 Introduction Water policy of the European Union has set new requirements for the tasks of engineering and water management. Currently, one of the most important tasks of water management in accordance with the requirements of the Water Framework Directive of the European Union is to prevent the deterioration of water bodies and to achieve good status for all waters by the end of For surface water "good status" is determined by the "good ecological status". In the case when the current biotic and physicochemical is good, according to the WFD hydromorphological assessment may be taken into account and reduce the overall rating by one step. Authors stress that hydromorphological and physicochemical parameters as creating live conditions for the nature should be taken first into account.
4 Methodology - In situ measurements: - geodesy measurements - bedload - hydrological data - bed stability prognosis (ARMOUR)
5
6
7 q ( ) q p 0 / c = φ τ τ p di d min a ( di ) = d max d min q ( di ) q ( di ) p p 0 0 ( di ( di ) ) x Probabilistic interpretation of grain movement - Gessler distribution drawn by Komura
8 Investigated objects: upper Skawa upper Biały Dunajec upper Czarny Dunajec
9 Biały Dunajec in Szaflary Bed stability as parameter describing
10 Czarny Dunajec in Chochołów
11 Skawa in Bystra Bed stability as parameter describing
12 f(x) = 0.009x R² = Biały Dunajec H [m a.s.l.] L [m]
13 751.5 Czarny Dunajec f(x) = 0.007x R² = H [m a.s.l.] L [m]
14 Skawa River f(x) = 0.006x R² = H [m a.s.l.] L [m]
15 I avg [ - ] I pools [ - ] I riffles [ - ] L pools [m] L riffles [m] L r / L p Biały Dunajec Czarny Dunajec Skawa
16 Hydrological data p% B Dunajec Q [m3/s] Cz Dunajec - / Skawa - / Biały Dunajec Czarny Dunajec Skawa slope n low flow n high flow
17 Biały Dunajec elevation [m a.s.l.] distance [m]
18 Biały Dunajec - cumulative curve H [m] Q [m3/s]
19 Czarny Dunajec - p elevat ion [m a.s.l.] distance [m]
20 7.74 Czarny Dunajec - cumulative curve H [m] Q [m3/s]
21 430.5 Skawa - p elevat ion [m a.s.l.] distance [m]
22 Skawa - cumulative curve H [m ] Q [m3/s]
23 Biały Dunajec
24 Czarny Dunajec
25 Skawa
26
27
28 100 Biały Dunajec - sieve curve Sp % d [m]
29
30 Czarny Dunajec - sieve curves Sp % bank current d [m]
31
32 100 Skawa - sieve curve Sp % bank current riffle pool bank current pool d [m]
33 H min H bankfull H terrace 1 h bankfull h terrace 1 2/3 bankfull Biały Dunajec Czarny Dunajec Skawa h ( Q% ) [m] / /
34 100 Biały Dunajec Sp % initial /3Qb 1.21 Q50% Qb Q25% Q10% Q5% Q1% st terrase d [m]
35 100 Czarny Dunajec Sp % init ial Q50% Q25% Q10% /3Qb 1.65 Q5% Q1% Qb d [m]
36 Skawa Sp % initial 2/3Qb Qb 1.19 Qt 1.79 Q50% Q25% Q10% Q5% Q1% d [m]
37 Conclusions: channel capacity: - Biały Dunajec bankfull discharge is equal to Q50%, - Czarny Dunajec bankfull discharge is equal to Q5%, 2/3Qb = Q25%. - Skawa Q50% - floods terrace - Biały Dunajec - bed cover is moved for discharge smaller then Q50% - Czarny Dunajec and Skawa very stable bed surface layer Q1% In Szaflary the Biały Dunajec seems to be morphologically active. Bed erosion processes appear. Czarny Dunajec in Chochołów is cut into bottom of the bed. The bank erosion predominates. Skawa River has very stable bed. Erosion processes are found occasionally Bed is armored. River often floods it's valley.
38 Thank You
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