BackgroundSustainable Rivers Audit (SRA)• Establish 1750 Reference Condition• Assess five themes against reference condition 1. Fish 2. Macro Invertebrates 3. Hydrology 4. Physical Form (of River Channels) 5. Vegetation• Ongoing monitoring of themes against land-use, water–use vegetation cover, Climate
Methods• Metrics = Observed/Expected• Expected = Reference Condition valueIntegration:• to indicators, Theme Indices, Ecosystem health• using Expert RulesCurrent Data Reference Data Metrics
Aggregation: from Site to Basin• Zones for stratifying sampling effort• Samples at random sites or census of reaches within Zones• Aggregation from – Site to Zone; and – Zone to Valley.
Full Wave Form LiDAR • Entire backscattered signal recorded • Acquisition of a continuous section • Additional information on the illuminated surface structure (Chauve, 2007)
Data collection for new ThemesDerived layers and data include:• 1 m surfaces• 25 cm contour lines• Vegetation height surfaces• Bank and channel delineation• Channel wetted area polygons• Bank geometry and vegetation height measurements• Summarised to valley/zone reporting of River Health (observed vs expected)
Project ScopeSITES 23 Valleys across 1M sq. km X 70 sites per Valley = 1610 river sites + 31 control sites near airfields + 71 check sites = Total 1710 surveyed sitesPrimary DATA SETS 27 x base data sets for each siteMeasurements 50 x Physical Form Channel Measurements for each of 19 transects per site. 17 x Vegetation Measurements per bank area per vegetation polygon.TOTAL Over 2,000,000 measurements Over: 200,000 files
1. Map Channel Features2. Generate 19 x transect profiles3. Measure 50 x Channel attributes for each site / transect Channel Width Le ft B an Channel Depth e k gl Convexity Left B. Le An ng x-sectional area k t an h B Left Bank Inflexions ht g Ri Bed width