Description: Many of the fields in the attribute table of this shapefile are the results of running ArcGIS plugin Planform Statistics (Lauer and Parker, 2008) on the channels' traced banklines. Many fields have null values (typically 0) where banks could not be traced. The attribute table fields are:dFrmMNR_m (m) distance from the confluence of the Blue Earth and Minnesota Riverswidth (m) channel width where traced streambanks exist. These points were measured on the Blue Earth and Watonwan, but were calculated on the Maple and Le Sueur following the relationship between width and upstream area in Gran et al., 2013.chanElv (m) the elevation of the channel centerline from the 3m DEMChanSlp channel slope, averaged over a moving 6km long reachupstrmA_km (km^2) sampled from a flow accumulation raster created from a 30m resolution DEMc (m/a) channel migration rate, measured using Planform Statistics and the traced banklines. Data could not be accurately imported for the Maple and Le Sueur riversCRR_3km (m/a) arithmetic average bluff crest retreat rate within a circle of 3km radius. meanE (m/a) linear regression average (volume eroded/surface area) bluff erosion rate within a circle of 3km radius. E = ((2*retreat)+migration)/4sigmaE (m/a) the standard deviation of the meanE measurementsc_6km_av (m/a) channel migration rate arithmetically averaged over 6km reachescPerWidth (m/m/a) channel migration rate normalized to channel widthcPerW6km (m/m/a) 6km reach averaged channel migration rate normalized to channel width
Copyright Text: Andrea Johnson
Stephanie Day
Martin Bevis (bevisma@gmail.com)
Karen Gran (kgran@d.umn.edu)
Drew Faherty
Patrick Belmont
Description: Bluffs were initally identified on a 3m resolution digital elevation model as areas that had more than 3m of relief within a 9x9m square. Features or portions of features were removed from the dataset until only bluffs adjacent to the modern channel remained. The following is a description of the fields in this shapefile's attribute table:Migration NDSU-summarized channel migration at the bluff toe (m/a). For this column, zeroes are null.Retreat NDSU-measured bluff crest retreat (m/a) 9999=null, zeroes are real valuesErate bluff erosion rate “E,” calculated from measured migration and retreat (m/a) = ((2*retreat)+migration)/4Height relief on Patrick’s GBER 3m DEM within the bluff polygon. (m)arcMapA map area, as calculated by arc (m^2)SA_AtanTht surface area (vertical), (m^2) = Area*tan(meanSlope)mean Slope (degrees)Aspect aspect binned into 8 groupsVegComb10 0 = bare in 2010 NAIP aerial photos1 = vegetated in 2010 aerial photosprobVeg the proportion of bluff surface area that is vegetated with in a circle of 3km radius of each bluffPrk 0 = no Steenberg et al., 2012 mapped bedrock outcrop on bluff (Prk = Paleozoic Rock)1 = MGS mapped bedrock outcrop on bluffHal 0 = no Belmont et al., 2011 mapped Holocene alluvium on bluff1 = Belmont et al., 2011 mapped Holocene alluvium on bluffPal 0 = no Jennings et al., 2012 mapped Pleistocene alluvium on bluff1 = Jennings mapped Pleistocene alluvium on bluffFPtrap 0 = no bluff sediment trapped on floodplain. Based on subwatershed and Belmont 2011.1= bluff sediment trapped on floodplainautoTEmeas “trapping efficiency” (%) the percentage of bluff sediment trapped in downstream lakes, based on NHDlakes, DNR bathymetry, and the middle curve (0.1) from Brown, 1943.Watershed Blue Earth, Watonwan or Le SueurSubwatershed a subwatershed delineationBudget_rate a broader subwatershed delineationEcode 1 = measured E2 = E interpolated from the average of the rates measured within a 3km radius3 = E extrapolated from GBER, subwatershed, or with consideration of vegetation Einterp E, for bluffs with interpolated EEextrapAll E, the average subwatershed bluff erosion rateVeMeas Volume eroded, (m^3/a) on bluffs with measured EVe all Volume eroded. (m^3/a) extents not trimmed, Prk included, veg extrapolation, interpolationVe all_Veg Volume eroded with vegetation-specific extrapolation. (m^3/a) extents trimmed, Prk included, veg extrapolation, interpolationLoad_pTex Load, (Mg/a) nostorage, bedrock included. Calculated with variable mud mass/volume of sediment eroded based on mapped Quaternary alluvium.loadTrap Load, (Mg/a) storage of bluff sediments on floodplains and in lakes, bedrock included. Calculated with variable mud mass/volume of sediment eroded based on mapped Quaternary alluvium.
Copyright Text: Martin Bevis (bevisma@gmail.com)
Karen Gran (kgran@d.umn.edu)
Andrea Johnson
Stephanie Day
Description: Subwatersheds in this shapefile are based on geomorphic setting (knickpoint location), confluences, and DNR HUC 12 level watershed polygons. Fields in the attribute table are:area (m^2) subwatershed areasubwatershed the name of the subwatershedwatershed coarser resolution than subwatershedbudget rate the groups of subwatersheds over which bluff erosion rates were averaged in the GBERB fine sediment budgetBluff_AvgE the average bluff erosion rate in each budget subwatershed group
Copyright Text: Karen Gran (kgran@d.umn.edu)
Stephanie Day
Martin Bevis (bevisma@gmail.com)
Patrick Belmont
Color: [0, 0, 0, 255] Background Color: N/A Outline Color: N/A Vertical Alignment: bottom Horizontal Alignment: center Right to Left: false Angle: 0 XOffset: 0 YOffset: 0 Size: 8 Font Family: Arial Font Style: normal Font Weight: normal Font Decoration: none
Description: These "lakesheds" are catchment areas for each lake in the GBEBR included in the National Hydrography Dataset lakes. Catchment area was determined with the watershedtool using a pourpoint placed on the cell with the highest flow accumulation value in each lake (from a 10m resolution DEM). Catchment area and lake volume were related (after Brown, 1943) to find a trapping efficency for each lake. Lake depth was assumed to be 2m for all lakes. The fields in this feature's data table are:lake area: (m^2) Lake surface area CW ratio (m^3/km^2) the ratio of the lake capacity and watershed area see Brown, 1943 and Verstraeten and Poesen, 2000)shed_A (m^2) Lake catchment area TE low (%) the trapping efficency using Brown's (1943) lower curveTE high (%) the trapping efficency using Brown's (1943) upper curveautoTE mid (%) the trapping efficency using Brown's (1943) middle curveSubwatershed a subwatershed delineationWatershed Blue Earth, Watonwan or Le SueurBudget_rate a broader subwatershed delineationarcMapA (m^2) the area of the feature
Copyright Text: Martin Bevis (bevisma@gmail.com)
Karen Gran (kgran@d.umn.edu)