on streams throughout the USA Tonia Hack William Sanford Department of Geosciences Colorado State University Separate hydrograph using 2component end member mixing Estimate baseflow Compare to analytical methods fixed interval sliding interval local minimum ID: 1022243
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1. Stream flow hydrograph separation using end member mixing analysis on streams throughout the USATonia HackWilliam SanfordDepartment of GeosciencesColorado State University
2. Separate hydrograph using 2-component end member mixingEstimate baseflowCompare to analytical methods: fixed interval, sliding interval, local minimumApply to various US streamsApproach
3. Hydrograph Separation2-component hydrograph separationAnalytical methods use constant time base of direct runoff from event to event (Linsley et al., 1982)N = 0.8A0.2N is time in days after peak discharge that all discharge is considered baseflowA is watershed area in km2Analytical methods use 2N* moving time windowOdd integer between 3-11 closest to 2Ne.g. A=112km2 N=0.8(1120.2)=2.06 2N=2(2.06)=4.12 2N*=5
4. Sliding Interval Fixed Interval Local MinimumAnalytical Methods(Pettyjohn and Henning, 1979; Sloto and Crouse, 1996)
5. BF is daily baseflowQ is daily dischargeQC is daily conductanceROC is runoff conductanceBFC is baseflow conductanceMethod chosen due to availability of USGS discharge and specific conductance dataConductivity Mass Balance (CMB) Method(Stewart et al., 2007)
6. Study SitesGroundwater regions from Thomas (1952)Stream & LocationUSGS #UTM CoordinatesDrainage Area (mi2)Buck CreekLongs SC0211040033°57'12", 78°43'12"49.4Silver RiverL'Anse MI0404315046°48'15", 88°19'01" 64.7Sagehen CreekTruckee CA1034350039°25'54", 120°14'13" 10.5
7. Preliminary Results
8. Preliminary Results
9. Preliminary Results
10. Preliminary ResultsStreamCUMULATIVE BFCMB DEPTH (cm over area)METHOD2N*CUMULATIVE UNCALBRATED BF DEPTH (cm over area)% DIFFER-ENCE BFCMB : BFmethodCALI-BRATED 2N*CUMULATIVE CALIBRATED BF DEPTH (cm over area)% DIFFER-ENCE BFCMB : BFmethodBuck Creek Longs SC21.51Sliding Interval520.853.12520.853.12Silver River L’Anse MI40.84Sliding Interval577.9-62.423140.96-0.29Sagehen Creek Truckee CA26.33Local Minimum357.85-74.893322.3516.35
11. 2 component CMB shown to estimate baseflowSnowmelt signal affects analytical method baseflowCMB estimates lower cumulative baseflow compared to analytical methodsNext steps include:Calculation of baseflow during periods of non-snowmeltCalibrate analytical method baseflow to CMB baseflowSummary
12. Thank You!