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Jana N ábělková , Dana Kom ínková , Gabriela Šťastná, Jakub Jirák

OVLIVNĚNÍ VODNÍCH TOKŮ SILNIČNÍM OKRUHEM KOLEM PRAHY. Jana N ábělková , Dana Kom ínková , Gabriela Šťastná, Jakub Jirák. 30.9 – 1.10.2010 Velké Bílovice. Městské vody 2010. Watercourses in urban areas. r oad traffic – important role within anthropogenic activities

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Jana N ábělková , Dana Kom ínková , Gabriela Šťastná, Jakub Jirák

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  1. OVLIVNĚNÍ VODNÍCH TOKŮ SILNIČNÍM OKRUHEM KOLEM PRAHY Jana Nábělková, Dana Komínková, Gabriela Šťastná, Jakub Jirák 30.9 – 1.10.2010 Velké Bílovice Městské vody 2010

  2. Watercourses in urban areas • road traffic – important role within anthropogenic activities • road/highway runoff and air contamination (emissions from vehicle exhausts) • pollutants: ammonia, nitrites, nitrates, toxic metals, PAHs • increase of natural discharges of road/highway runoff • modification of aquatic environment in chemical, morphological as well as biological parameters, deterioration of water quality • evaluation of impact of highway runoff on small urban streams ordered by the Road and Motorway Directorate of the Czech Republic • requirement: two sampling campaigns – rain event and dry weather • three urban streams, sampling above and below impact • chemical quality, morphological status and quality of benthic communities

  3. Popis zájmového území čtyřproudá komunikace – pražský okruh napojení na D11 (Hradec Králové) a R10 (Mladá Boleslav) Průměrné zatížení: 25 tisíc aut za den

  4. Popis zájmového území délka:2.2 km povodí: 4 km2 průměrný průtok:0.02 m3.s-1 C-A C-B Chvalka

  5. Popis zájmového území délka:6.8 km povodí: 11 km2 průměrný průtok: 0.02 m3.s-1 S-A S-B Svépravický potok

  6. Popis zájmového území R-B Rokytka R-A délka:36.2 km povodí: 134.85 km2 průměrný průtok: 0.3-0.4 m3.s-1

  7. Popis zájmového území C-0 C-A C-B S-A Chvalka X S-0 S-B Svépravický potok R-B R-A Rokytka R-0

  8. Monitored indicators • basic chemical indicators of water quality: pH, electrolytic conductivity, temperature, DO, NH4+-N, NO3--N, BOD5, COD, total P, SS • specific pollutants associated with the road traffic: trace metals (Cd, Cu, Cr, Hg, Ni, Pb and Zn) and PAH (15 componds) • water • sediment and soil samples (TOC) • Evaluation of results water: Czech standard CSN 757221 I. class – clean water II. class – slightly polluted III. class – polluted IV. class – strongly polluted V. class – heavily polluted sediment: USEPA Toxicity Reference Values (TRV) soil: Decree No. 13 of the Ministry of the Environment of CR (1994)

  9. Basic chemical quality of water • evident anthropogenic impact • all sampling sites strongly or heavily polluted • the worst: the Rokytka creek - BOD, COD, total P and NH4+-N • no evident deterioration in B profiles • no significant difference between wet and dry weather flow

  10. Specific pollutants in water • PAHs and metals – 1st class (clean water) in all sampling sites • no differences between A and B sampling sites • expectation: - increased concentrations in water during rain events - the most significant increase occurs in profiles below highway runoff discharges did not confirmed

  11. Specific pollutants in solid phase - PAHs • values exceeding TRV (esp. HMW PAHs)  danger and irreversible changes in aquatic organisms communities • lower concentrations in soil sample - non-point-source pollution from highway not confirmed • no evident relation between TOC and PAH in sediment • the Chvalka c. (dry weather), the Svepravicky c. (both campaigns): increase of PAHs in B profiles compared to A • higher concentrations in C-0 than in C-B • building-up area in the surrounding of S-B ?? different causes of increased PAHs than highway runoff ??

  12. Specific pollutants in solid phase – toxic metals • no definite evidence of higher load in sampling sites affected by highway runoff • exception: the Rokytka creek - higher Cd, Cr, Cu, Hg and Ni below discharge

  13. Specific pollutants in solid phase – toxic metals • dangerous concentration of Hg, Cu, Ni and Zn - all sites, the Rokytka c. also Cd, Cr and Pb • soil sample – less concentrations with no risk

  14. Specific pollutants in solid phase – toxic metals • Cu, Ni, Pb, Zn and partly Hg positive correlation with TOC

  15. no obvious deterioration of water quality in sampling sites directly impacted by highway runoff • studied creeks can be characterized as strongly or heavily polluted based on basic chemical analyses of water quality also in sampling sites upstream • no significant difference between rain event and dry weather flow water quality observed • sediments of the studied creeks are polluted by PAHs and toxic metals, but no demonstrable direct relation with the highway runofffound out • confirmed association of some metals (Cu, Ni, Pb, Zn and partly Hg) with OM content in sediment, but not confirmed for PAHs • An unclarity still exists in binding behavior of specific pollutants in sediment, a lot of different factors of the aquatic environment of small urban streams play an important role within that the highway runoff impact takes less significant part for this specific case.

  16. Děkuji za pozornost nabelkova@fsv.cvut.cz 30.9. – 1.10.2010 Velké Bílovice Městské vody 2010

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