Patrick Baskfield. Scott Matteson. Minnesota Pollution Control Agency. Minnesota State University Water Resource Center
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1 Regression Analysis of Total Suspended Solids Concentrations to Estimate Streambank, Upland Field, and Classic Gully Sediment Contributions to Minnesota River Tributaries Patrick Baskfield Minnesota Pollution Control Agency Scott Matteson Minnesota State University Water Resource Center
2 Acknowledgements Scott Matteson High Island CWP, MNSU Water Resouce Center Paul Wymar Chippewa River CWP Watonwan River CWP Maple River CWP Scott MacLean Little Cottonwood River, Seven Mile Creek CWP s USGS Bill VanRyswyk - MDA
3 Sediment source contributions: what are the percentages? Chetomba Creek Photos courtesy of Stephanie Klamm Hawk Creek CWP
4 Sediment Sources: Streambanks and Bluffs Construction Sites Classic Gullies Urban Stormwater Agricultural Fields (includes sediment from open tile intakes)
5 The Link Between Runoff Source and Sediment Source Contributions to Rivers Field Erosion Runoff Type Overland Flow
6 The Link Between Runoff Type and Sediment Source Contributions to Classic gully Erosion Runoff Sources: overland flow drainage tile, interflow Rivers Bottom of ravine 10/18/07 Top of ravine 10/18/07
7 The Link Between Runoff Type and Sediment Source Contributions to Rivers Streambank Erosion Runoff Sources overland flow, drainage tile, groundwater, interflow Maple River Lower Monitoring Site
8 TSS Streambank Erosion Regression Method Example: Maple River Watershed slope Map courtesy of Eileen Campbell - MPCA Map courtesy of Scott Matteson MNSU Water Resource Center
9 Sampling Frequency
10 TSS Streambank Erosion Regression Method Hypothesis Lower Maple River Stream Bank Erosion Regression Samples Total Suspended Solids (mg/l) y = 0.081x R 2 = N Non-SBE TSS Samples SBE TSS samples Linear (SBE TSS samples) Discharge (cfs)
11 Step 1: Select Samples For SBE Regression Sample Discharge Example: Samples used in the 600 to 900 cfs sample category: 21 samples in entire sample set, 4 used in the SBE regression (19%) Discharge Range of Sample Categories Lower Maple River cfs Flow TSS 4/22/ /6/ /23/ /27/ /09/04 Each sample category 111contains approximately 3/29/ % of the total number 115 of water quality /4/2005 samples collected 134 from (247 samples) 06/15/ /03/ /12/ From each sample category approximately 08/06/ % of the samples 282 with the lowest TSS 5/12/2005 concentrations are 330 used in the stream bank /31/2005 erosion regression /12/ /11/ /10/ /21/ Example category /30/ cfs /21/ /12/ /09/ Note- sub-samples selected represent 0% 9% the 16% full range 24% of flows 31% in 40% this category 47% 55% 62% 71% 78% 85% 93% Cumulative Percentage of Total Number of Samples 4037
12 Step 2: Create SBE Regression Stream Bank Erosion Regression Lower Maple River Total Suspended Solids (mg/l) y = 0.081x R 2 = TSS (mg/l) Linear (TSS (mg/l)) Discharge (cfs)
13 5000 Stream Bank Erosion Regression Samples and Daily Average Discharge Lower Maple River 4500 Daily Average Discharge (cfs) Flow SBE Samples /14/ /01/ /17/ /05/ /24/ /10/ /28/ /14/2007 Date
14 Step 2: Compute Daily Streambank 1000 Erosion (SBE) Loads Total Suspended Solids (mg/l) With a Daily Average Discharge of 100 cfs, the estimated SBE TSS concenetration using this regression would be 16.8 mg/l. The Daily TSS load from stream bank erosion is estimated to be 4114 kg (load = concentration x flow) 16.8 mg/l y = 0.081x R 2 = TSS (mg/l) Linear (TSS (mg/l)) Discharge (cfs) Daily Average Flow x SBE TSS Concentration = Daily SBE Load
15 Step 3: Compute Seasonal Streambank Erosion Load (generally 4/1 through 9/30) Sum of Daily SBE loads = Seasonal SBE load
16 Step 4: Compute the Streambank Erosion Proportion of Seasonal TSS Loads Lower Maple River Streambak Erosion Contribution Year Seasonal TSS Load (tons) Seasonal Stream Bank Erosion TSS Load (tons) % of Seasonal TSS Load from Stream Bank Erosion % % % % % Numeric 5 year average SBE contribution 40%
17 Percentage of Seasonal TSS Loads from Streambank Erosion Using TSS Flow Weighted Mean Concentrations Year Lower Maple River Streambak Erosion Contributions monitoring season dates Lower Maple Seasonal TSS FWMC Lower Maple Stream Bank Erosion TSS FWMC % of TSS load from Streambank Erosion /24-10/ % /21-10/ % /1-10/ % /31-10/ % /20-10/ % Numeric 5 year average SBE contribution 40%
18 Summary Table Average Streambank Erosion Proportion of Seasonal TSS Loads by Watershed Watershed Data Years Average streambank erosion proportion of seasonal TSS load Watonwan R. 7 41% High Island Cr. 5 31% Little Cottonwood R. 7 20% Chippewa R. 8 38% 7 Mile Cr. 8 20% Maple River 5 40%
19 Computing Field and Classic gully TSS Load Proportions Upper Maple River Site
20 Upper Maple River SBE Regression 500 Total Suspended Solids Concentration (mg/l) y = x R 2 = Discharge (cfs) Non - SBE TSS SBE TSS Samples Linear (SBE TSS Samples)
21 Streambank Erosion Proportion of Seasonal TSS Load by Year Upper Maple River Year Upper Maple River - TSS Source Contributions Seasonal TSS FWMC. Streambank Erosion TSS FWMC Field Erosion TSS FWMC % of Seasonal TSS Load from SBE % of TSS Load from Field Erosion % 48.1% % 57.2% Two Year numeric Average SBE contribution 47%
22 Year Upper Maple River - TSS Source Contributions Seasonal TSS FWMC. Streambank Erosion TSS FWMC Field Erosion TSS FWMC % of Seasonal TSS Load from SBE % of TSS Load from Field Erosion % 48.1% % 57.2% Two Year numeric Average SBE contribution 47%
23 TSS Load Source Proportions for the Lower Maple River Year Lower Maple Seasonal TSS FWMC Lower Maple River Source Contributions Lower Maple SBE TSS FWMC Field Erosion TSS FWMC (computed from Upper Maple site) % of TSS load from SBE % of TSS load from Field Erosion % of TSS load from Classic Gulleys % % % % 17.5% 9.3% % 20.6% 33.5%
24 Caveats and Criticisms Streambank Erosion from ice Rainfall on streambanks is not included Ephemeral gully erosion from tile outlets is included in the SBE calculation Too many samples: over-predicting SBE contributions More SBE occurs when flows are rising
25 Conclusions For the analyzed watersheds, on average no more than 40% of TSS load can be from SBE SBE proportions are variable from year to year: climate, timing of events affect TSS source contributions When field and gully erosion are the dominant sediment sources, streams are the dirtiest In some watersheds all major sediment source contributions can be determined with this method.
26 Daily Rainfall 2006 Lower and Upper Maple River Monitoring sites Red bars are the Lower Maple 1.5
27 minute rainfall intensities and discharge at the Lower Maple site. During the early April rains (the two big events at the beginning of this hydrograph), the maximum one hour rainfall intensity was about 0.25 /hr. The maximum value on the scale is 0.5. Note how little influence large intense rains have on these systems after crop canopies close. 0.1
28 Streambank/Bluff Erosion Estimates for High Island Creek Watershed High Island Creek Watershed Rush River Watershed
29 Percentage of Land with Slopes Greater than 12% by Watershed
30 Site 5P Site 10P
31 Site 5P Site 10P
32 Discharge (cfs) 2002 High Island Creek Daily Average Discharge and Total Suspended Solids Concentrations fold difference fold difference % of the TSS at a higher flow /30 4/19 5/9 5/29 6/18 7/8 7/28 8/17 9/6 9/ Date 30 fold difference 4.5 times less sediment at a higher flow Flow smpl collected 327
33 2001 High Island Creek Total Suspended Solids Load
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