The River Restoration Centre therrc.co.uk. Understanding Fluvial Processes: supporting River Restoration. Dr Jenny Mant
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1 The River Restoration Centre therrc.co.uk Understanding Fluvial Processes: supporting River Restoration Dr Jenny Mant
2 Understanding your catchment Hydrology Energy associated with the flow of water affects the system Sedimentology Relationship between silt, sand and gravel size/position to hydrological regime River Processes Adjustment in shape and size of the river and topographical changes in the floodplain in relation to climatic conditions and geology DRIVERS = Natural and Anthropogenic Affect the relationship between river and floodplain features, habitats and their quality?
3 Sediment: river and floodplain processes... The study of sediment sources, fluxes and storages within the river channel over short, medium and longer timescales and of the resultant floodplain morphology (Sear and Newson, 1993) the pattern of which is determined by the hydrological regime in a natural system. Helps to identify appropriate mitigation measure.
4 Catchment the hydrology Streams receive water from their drainage basin Discharge: related to catchment area plus other influences
5 Discharge Discharge Small flow is exceeded a lot of the time, a given high flow is rarely exceeded Discharge has a magnitude- frequency relationship both the very high and very low flows are rarer, the middle size flow more common 0 99 % of time equalled or exceeded Important because impact on how much sediment and associated pollutants will move in the system and where they will be transported to within the context of the catchment characteristic.
6 Effects of hydrology Catchments receive inputs (precipitation) Transformed to outputs (streamflow and evaporation) Input = output (allow for storage) Output is continuous. Inputs (precipitation) are discrete (i.e. separated by time/space). Note: Visible and invisible inputs (e.g. seepage) Some river flow in summer maybe sustained by the flow of groundwater
7 Types of flow to the river Base or steady flow: Slower route: rate depends on geology and landuse and flows through rather than over land. Flashy or overland: Catchments respond very quickly: depends on geology and human intervention. Affects how quickly sediment, water and pollutants enter the river. Impact on aquatic habitat distribution and quality. Impacted by human intervention in the catchment
8 River Pontbren Catchment Field site for Flood Risk Management Research Consortium (FRMRC) what characteristics can you see?
9
10 Mechanisms of sediment movement
11 Understanding connectivity in the sediment transfer system Where are the sediment sources, transfers and sinks?.. Helps to identify risk
12 Height (m) Gradient or long profile (the energy curve) Long profile Catchments naturally saucer shaped Steeper at the top - lots of energy but less catchment area so less discharge Middle reaches - less gradient, more discharge from larger catchment Lower reaches- lower gradient but highest discharge. Distance downstream (m) So where you are in the catchment effects erosion/deposition characteristics
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17 Summary of controls
18 Human intervention and disruption to natural sediment sources
19 The case of realignment
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22 The effect of a sediment pulse from upstream Erosion and sedimentation in the middle course a) Lateral channel shift b) Increase in sediment supply
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25 Adjustment to disturbances
26 Discharge Velocity distribution in channel Channel geometry or habitats erosion & deposition bed roughness selective transport Bed material characteristics Bedload transport availability of sediment velocity profile Bed shear stress competence & capacity after Ashworth and Ferguson (1986) Sediment supply
27 Minimising risk and uncertainty: understanding the catchment context
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29 Human intervention: sediment and pollutant sources and sinks
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32 River habitats
33 What do we want to achieve? Full of native wildlife Water low in pollution Natural structure and connectivity Sufficient water flow From RRC s PRAGMO document (Judy England)
34 A range of habitats From RRC s PRAGMO document (Judy England)
35 What level of detail do we need to consider? Frissell et al. (1986)
36 Processes influencing ecology Longitudinal processes: Hydrology Fluvial geomorphology Lateral processes: Interactions with riparian zones & floodplains Internal processes: Predation, competition, life cycle etc.
37 Habitats for invertebrates - vegetation Bank full water level semi terrestrial vegetation emergent broad leaf vegetation Low water level tree roots terrestrial vegetation emergent narrow leaf vegetation floating leaf vegetation Submerged vegetation
38 Habitats for invertebrates - Exposed riverine sediments Glide physical Riffle Pool Marginal dead-water Large woody debris Water surface Bank Marginal damp areas Water table Hyporheos Groundwater
39 Case studies
40 Norman Park, Ravensbourne, London ( from the MOT)
41 Works undertaken New open course, culvert buried; Spoil used to create topography ; Planting with trees, shrubs, wildflowers & grass; Footbridge and stepping stones; Gravel beach ; Sediment fan at lower end; Gravel introduced into the bed; Safe & shallow bank slopes; Allows flooding to spill into the park and not the housing downstream.
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47 River Bure, Norfolk: before
48 During
49 After
50 Hawley manor, Darent 2006
51 After (design N Holmes)
52 Midsomer Norton stream (Nr Bristol before)
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54
55
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57 After
58 Babingly brook, Norfolk an ornamental pond
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60 During
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62 After
63
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