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Peatscapes: Monitoring of Hydrology and Water Quality at Geltsdale and Priorsdale Report of Phase 1: Nov 2007 – Mar 2009 Dr Jennine Jonczyk, Dr Mark Wilkinson,

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Presentation on theme: "Peatscapes: Monitoring of Hydrology and Water Quality at Geltsdale and Priorsdale Report of Phase 1: Nov 2007 – Mar 2009 Dr Jennine Jonczyk, Dr Mark Wilkinson,"— Presentation transcript:

1 Peatscapes: Monitoring of Hydrology and Water Quality at Geltsdale and Priorsdale Report of Phase 1: Nov 2007 – Mar 2009 Dr Jennine Jonczyk, Dr Mark Wilkinson, Dr David Rimmer and Dr Paul Quinn

2 Some of the features in the catchment Upper Belford Burn R2 R3 BEL 1.35km1.15km 1.85km “Pilot pond” Features 1 to 3 R1 PILOT POND Overland flow following gradient of slope STREAM SPILL Belford Burn Woodland Diversion structure Overflow Leakage Roughly 200m R1 stream gauge Pilot pond stream gauge Leaky wooden barrier

3 Some of the features in the catchment Upper Belford Burn R2 R3 BEL 1.35km1.15km 1.85km “Pilot pond” Features 1 to 3 R1

4 Some of the features in the catchment Upper Belford Burn R2 R3 BEL 1.35km1.15km 1.85km “Pilot pond” Features 1 to 3 R1

5 …but that was last week! Lower Lady’s well feature

6 Outline 1.Questions to answer 2.Hydrology 3.WQ 4.Peatscapes II

7 Questions to answer How does grip blocking effect :- 1.Water table 2.Water colour (& Dissolved Organic Carbon; DOC) 3.Suspended sediment HOW are we investigating this? 1.(Water table) using pressure transducers in the peat 2. (Colour) grab samples taken from grips and downstream pts and measuring DOC and absorbance in lab. 3. (SS) Filtering grab sample

8 Working Hypothesis ARE grips like open drainage ditches? What happens when it rains? Q WT

9 Generic experimental Lay-out

10 Geltsdale Hydrology: Grips

11 Geltsdale Hydrology: Water table

12 E.g. Data anomalies

13 Geltsdale Hydrology:- Response in grips in May 2008

14 Geltsdale Hydrology: Water table response in May 2009

15 Geltsdale Hydrology: Response in grips during Sept 2008

16 Geltsdale Hydrology:- response in water table during Sept 08 storm

17 Observations in unblocked grips No response in water table position - no matter where they are Flashy spiky flow in grips.

18 Observations in blocked grip Nice and smooth – less spiky and less flashy response in grip Water table position is again not responding to flow

19 Working Hypothesis Grips and Pipes are ‘off’ even though there may be a water table present Small additions of percolating rain – connect all the pipes and grip together What comes in goes out When rain stops, flow stops and pipes empty WT pipes grip Active flow paths in the acrotelm (top) layer

20 Water Quality

21 Colour Water colour is caused by the presence of dissolved organic compounds – predominantly humic and fulvic acids, which are the products of decomposition from organic soils. Current EU Drinking water standard for Water colour is :- 20 Hazen Colour of River Tees is: Hazen

22 Colour Geltsdale Priorsdale

23 DOC Dissolved Organic carbon is derived from organic matter and has a strong correlation with WATER COLOUR. DOC is an important component of the carbon cycle in streams and a primary food source. Evidence for upward trend in DOC concentrations related to atmospheric deposition changes. (Worrall et al, 2004; Evans et al, 2006)

24 DOC Geltsdale Priorsdale

25 E4/E6 ratio Ratio of humic acid(E4) and fulvic acid(E6) Used to represent the degree of humification in peat Humification is decomposition of vegetation….. Ratio below 5 classified as humic above 5 classified as fulvic

26 E4/E6 ratio Geltsdale Priorsdale

27 Suspended Sediment Some studies on IMPACTS of suspended sediments from peatlands (Holden 2005, 2006; Rothwell et al 2005; Yeloff et al 2005; White et al 1996; Stewart 1963 ) Little data on erosion rates or supply to main channels (Holden 2007) Ranges of SS from Holden 2007 at peak discharge were Undisturbed catchment (1) mg/l Grips (3) mg/l Blocked grips (2) mg/l

28 Geltsdale Priorsdale Suspended sediments

29 Peatscapes II Moving pressure transducers closer to the grip edge to see if there are any edge effects from unblocked grips Mapping all observation sites to look at the effect of surface topography on the recorded depth to the water table Putting pressure transducers in the shallow acrotelm layer to study the activity of runoff within the layer. The layer could be producing a temporary perched water table and the instruments will pick this up. In Priorsdale we could move the flow gauge from one unblocked grip to the other to see if it has higher flow rates. WT Pipes in the catotelm layer grip Active flow paths in the acrotelm layer New hydrological hypothesis

30 Summary Hydrology Unblocked grips respond rapidly to rainfall RO smoothed in blocked grips Some attenuation from blocked grip area and buffered by interaction with acrotelm area but still HIGH RO to main channels New hypothesis- ON/OFF switch WQ No clear effect of blocking on colour and DOC at either site YET Increase of colour and DOC in blocked (like Worrall et al, 2007 and Dodd, 2008) Seasonality Peatscapes II Moving some instrumentation to test new hypothesis


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