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Faculty of Environment: Martin Neruda, Tomáš Přikryl, Jitka Fikarová
River Board Povodí Ohře: Lucie Tichá
Belfast, Questor, 9.3.-12.3.2010
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ContentMonitoring in Chabařovice and Most lakes
Rehabilitation of Černý potok stream
Rainfall-runoff modelling with Artificial Neural Networks
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Chabařovice lakeMeasuring profiles:
Eutrophication reservoir: 3 places:− 1) inside the reservoir - in the other end of the
reservoir− 2) inside the reservoir - around the outlet− 3) outside of the reservoir - below the outlet in the
channel
Chabařovice lake: 1 place – inside the lake in the north – west part
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Chabařovice lake – area of interest
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Measuring profiles
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MethodologyCatch a small fish and plankton with special
netMake a conservation in a small plastic bottle
with a chemicalsIdea is to say which species of fish come to
the lake because of their influence to the fish stock
From the last year: research of plankton species to have a detailed picture about the lake‘s ecosystem
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Eutrophication lake - in the other end of the reservoir23. 7. 2009 – fish results: 10 pieces of Scardinius erythrophthalmus + 1 piece of Tinca tinca
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Eutrophication reservoir - around the outlet28. 7. 2009 – fish results: 10 pieces of
Scardinius erythrophthalmus26. 10. 2009 – plankton results: Cyclops
vicinus, Moina macrocopa, Ceriodaphnia reciculata – lots of them
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Eutrophication lake - below the outlet in the channelNo fish speciesPlenty of the invertebrates (juveniles of insects), many
species of plankton – failed the conservation
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Chabařovice lake – inside the lake in NW partAimed only to plankton: 7. 9. 2009 Metacyclops
gracilis, Melosira varicus, cyclops sp. Daphnia magna – many of them
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Most lake – new oneProfiles: 2 places1) Inside „Most“ lake2) Small lake above Most lake
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Most lake - inside14. 8. 2009 small species of plankton12. 11. 2009 Chydorus sphaericus, Daphnia
magna, Acanthocyclops nanus – many of them
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Small lake above the Most lake
5 pieces of Scardinius erythrophthalmus Small species of plankton (algae)
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Černý potok streamIn Ore mountains – north from Usti – boarder with
Germany2 phases of rehabilitation:1) 1st August- 31st December 20092) 1st August 2010 – 31st December 2010Organised by Agency for Nature
Conservation and Landscape Protection of the Czech Republic in Ústí nad Labem
Pictures from October 2009:
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Information about Rainfall-runoff modellingMain goal: improving flood warning system in
Czech Hydrometeorological Institute For small size river basins Based on several time series of hourly
measured dataFor short time runoff predictions (1-6 hours)
based on runoff and rainfall data
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R-R modellingSignificant data for prediction (made by
correlation analysis): runoff data, short time rainfall history, API values
Multilayer perceptronRadial basis function Results made in 6 weeks internship (Petr
Paščenko) within the scope of the project HPC Europa 2 at the EPCC Department of the Edinburgh University
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Results Ploučnice RiverMain problem:- overtraining of the network – poor
generalization - small number of extreme events which
makes it difficult for a model to predict the amplitude of the event
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Results Experiments with absolute and relative runoff
predictionNeural model shows about 5 % improvement
in terms of efficiency coefficient over linear models
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Results Best behavior - Multilayer perceptrons with
one hidden layer trained by back propagation algorithm and predicting relative runoff
Genetically evolved input filter improves the performance of yet another 5 %
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Future Experiments in on-line prediction using real-
time data from Smeda River (Jizerské hory mountains) with 6 hours lead time forecast
Following the operational reality we will focus on classification of the runoffs into flood alert levels
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Results
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The two diagrams show the statistically relevant input variables for the two linear regression models. The red cells variables have 0.001, the violet have 0.01, the blue 0.1 and the white cells stand for less significant inputs.
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Thank you for your attention