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Estimating environmental flows (E-flows) in Poland Piotr Parasiewicz, Katarzyna Suska, Paweł Prus Fundig: Polish National Water Authority.

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Presentation on theme: "Estimating environmental flows (E-flows) in Poland Piotr Parasiewicz, Katarzyna Suska, Paweł Prus Fundig: Polish National Water Authority."— Presentation transcript:

1 Estimating environmental flows (E-flows) in Poland Piotr Parasiewicz, Katarzyna Suska, Paweł Prus Fundig: Polish National Water Authority

2 Fish monitoring data from different water bodies

3 Extrapolation framework – Generalization of species into habitat use guilds –Classification of water bodies according to fish communities structure –Selection of representative sites Unmodified hydromorphology Hydrograph data available min length: 100xchannel width –Drone supported aerial imagery (10cm resolution)

4 Target Fish Communities 1: mountain rivers and streams 4: lowland rivers 2: flysch rivers 5: lake connectors with salmonids 3: lowland streams 6: river connecting lakes, peat bogs and estuaries Associated Strongly rheophylic Rheophylic – gravel bed Sand-detritus bed Associated with sand and mud Rheophylic sand-gravel bed Generalist Associated with macrophytes Deep water body

5 Conditional Habitat Suitability Criteria …

6 Map of selected sites Maksymilian Rogowski, ARUP

7 Flow yield (cfsm) + 0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50% 00.511.522.5 Relative habitat area

8 x 15 days14 days x 31% threshold

9 Persistent Typical Catastrophic

10 10 Results Skawa – Type 2, flysch rivers subsistence rearing

11 Example

12 Hydrological standartisation for spatial transferability p b = specific flows/mean low flow of bioperiod Coeff. p b

13 Calculating E-flows Q sef,k = p b · q MBLF,k · A k p b = tabulated value of coefficient obtained from pilot studies specific for bioperiod and fish ecological river type q MBLF,k = specific mean low flow for the bioperiod at the cross-section k A k = catchment area at the cross-section k

14 Conclusions E-flows for bioperiods: spring spawning, rearing and growth, fall spawning, overwintering. Adaptive E-flow depends on the continuous durations of habitat deficit events at two levels: the subsitence and trigger. –Flow < eflow thresholds for a continuous period no longer than specified persistent and catastrophic durations. Standardization of specific E-flows by q MBLF -> transfer correcting for hydrological variability. The resulting coefficient p b has the similar values in the rivers of the same fish biological type. Valid for good HYMO TBC….

15 ADAPTING INLAND FISHERIES TO CLIMATE CHANGE. Poland, 26-30 June 2017 www.infish.com.pl

16 Simulation of HYMO modifications construction of impoundment; channel alteration through channelization; carrying out maintenance works;

17 Frequency increase of rare and critical habtat events after simulated river regulation

18 Hydromorphologic impacts on fish habitat I HSD = e -0.38|SKDS%-1|

19 Conclusions II Hydromorphological modifications cause dramatic increase in habitat stress days (HSD), potentially causing severe changes in the structure of fish communities. Applying the formulas presented above for hydromorphologicaly altered rivers and streams involves high risk that good ecological status or potential will not be achieved. Presently the only method for determining eflows in HMWB - > site specific habitat modelling studies. Very small number of pilot data - >veryfication needed.


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