Watershed, Hydrodynamic, Water Quality and Sediment Flux Modeling to Support TMDL Determinations, Lake Thunderbird
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1 Watershed, Hydrodynamic, Water Quality and Sediment Flux Modeling to Support TMDL Determinations, Lake Thunderbird 24 th Annual Conference Oklahoma Clean Lakes and Watersheds Association (OCLWA) April 8-9, 2015 Stillwater, Oklahoma
2 Lake Thunderbird Watershed-Lake Model Watershed and Lake Thunderbird Pollutant Sources Designated Uses & Water Quality Impairments Watershed and Lake Model Management Scenario What-if? TMDL for Lake Thunderbird
3 Lake Thunderbird Upper Little River basin (256 mi 2 ) 6,070 acre reservoir Public water supply for Norman, Midwest City & Del City (near OKC) Population 99,600 (2010) Urban stormwater runoff (Moore, Norman, OKC) Nonpoint source runoff from rural areas
4 Designated Uses, 303(d) Impairments & WQ Targets Flood control, water supply, recreation, fish & wildlife propagation Sensitive Water Supply Impaired for Warm Water Fish & Wildlife Propagation Impaired for Public Water Supply Annual 90 th percentile Turbidity < 25 NTU Surface DO > 5 mg/l Lake volume DO: < 50% can be < 2 mg/l, stratified season Annual average chlorophyll < 10 µg/l
5 EFDC HSPF Watershed Hydrodynamics Sediment Transport Water Quality Sediment Bed Sediment Flux Water Quality Targets Management Scenarios Flow, Loads
6 Little River at 17 th St. (L17) Little River at 60 th Ave. (L60) Rock Creek at 72 nd Ave. (Rock) HSPF Watershed Model 64 Sub-Watersheds West Elm Creek at 134 th St. (Elm) Hog Creek at 119 th St. (Hog) Total-P Monitoring Sites 1 Yr Calibration 4/2008-4/2009 Average hydrology WQ data, 5 sites,occ HSPF: Flow, TSS, Temperature, DO, BOD, N,P, Algae Source (kg/day) Total-N Total-P BOD Sediment Tributary ,933 Overland ,553 Total ,486
7 Streamflow & PO4: Little th Little River at 17 th St. (L17) West Elm Creek at 134 th St. (Elm) Hog Creek at 119 th St. (Hog) Little River at 60 th Ave. (L60) Rock Creek at 72 nd Ave. (Rock) Monitoring Sites Flow (cfs) PO4 (mg/l)
8 Lake Thunderbird Conceptual Model Mass balance cause-effect watershed flow, loading and lake water quality Riverine, transition, lacustrine zones affect reservoir transport and water quality Stratified in summer; well-mixed in winter Hypolimnetic DO depletion controlled by stratification and sediment oxygen demand Internal source of nutrients from sediment bed
9 Lake Model Data Sources Bathymetry Watershed flow & loads Meteorology Lake level, dam release Water supply withdrawals WQ (T,DO,TSS,N,P,Chl) Sediment bed (TP, TKN) OWRB survey, 2001 HSPF watershed model Oklahoma Mesonet USACE Tulsa District Central OK Master Conservancy District OWRB surveys, 8 sites OWRB surveys, 5 sites
10 EFDC Lake Model 1660 Cells,6 Layers Loads: HSPF Flow, WQ, Atm Dep N,P Hydrodyn: Lake level, Velocity, Wtemp Sediment: TSS, bed WQ: Chl, DO, C, N,P Sed Flux: SOD, N,P fluxes, Bed C,N,P Calibration: 8 sites, 1 yr, 4/2008-4/2009
11 Aug-2008 Storm, TSS 200 Legend Site2(Sfc)-Model (Layer 6) Site2(Sfc)-Data Site2(Bot)-Model (Layer 1) Site2(Bot)-Data Lake Thunderbird, Calibration (Final) Run517 Calibration Results: Time Series Summary TSS (Inorg + Org) (mg/l) Legend Site2(Sfc)-Model (Layer 6) Site2(Sfc)-Data Site2(Bot)-Model (Layer 1) Site2(Bot)-Data Lake Thunderbird, Calibration (Final) Run517 Calibration Results: Time Series Summary TSS- Site 2 Animation, Aug-2008 TSS (Inorg + Org) (mg/l) Apr-08 Jun-08 Aug-08 Oct-08 Dec-08 Feb-09 Apr Date 0 Apr-08 Jun-08 Aug-08 Oct-08 Dec-08 Feb-09 Apr-09 Date
12 Secchi Depth & Algae Chl 1 m Secchi -Site Legend Site2(Sfc)-Model (Layer 6) Site2(Sfc)-Data Site2(Bot)-Model (Layer 1) Site2(Bot)-Data Lake Thunderbird, Calibration (Final) Run517 Calibration Results: Time Series Summary Chlorophyll a (ug/l) μg/l Chlorophyll- Site Apr-08 Jun-08 Aug-08 Oct-08 Dec-08 Feb-09 Apr-09 Date
13 Dissolved Oxygen Legend Site2(Sfc)-Model (Layer 6) Site2(Sfc)-Data Site2(Bot)-Model (Layer 1) Site2(Bot)-Data Lake Thunderbird, Calibration (Final) Run517 Calibration Results: Time Series Summary Dissolved Oxygen- Site 2 Dissolved Oxygen (mg/l) River Flow Aug-2008 Storm Events Apr-08 Jun-08 Aug-08 Oct-08 Dec-08 Feb-09 Apr-09 Date
14 Aug-2008 Storm, Anoxic Volume River Flow Aug-2008 Storm Events Lake Thunderbird, Calibration (Final) Run517 50% Target Site 2 Anoxic Volume Anoxic Volume (%) Legend Site2Polygon, Anoxic Volume Anoxic Volume Site 2 Aug :56 Animation, Aug Apr 08 May 08 Jun 08 Jul 08 Aug 08 Sep 08 Oct 08 Nov 08 Dec 08 Jan 09 Feb 09 Mar 09 Apr 09 Date
15 EFDC Sediment Flux Model Biological Production & Deposition of POM POM diagenesis (decay) in bed Sediment oxygen demand (SOD) & benthic N,P fluxes Sediment bed C,N,P data from OWRB Di Toro (2001) Sediment Flux Modeling
16 Sediment Bed Surveys OWRB Surveys in July & December 2008 TKN, TP, % Solids Lacustrine (Site 1,2,4) Transition (Site 3) Riverine (Site 8) OWRB data & literature; fill data gaps for TOP, PO4, NH4, NO3, TON, TOC by zones
17 Sed Flux PO4: Model & Observations Lake Thunderbird, Calibration (Final) Run mg P m -2 day Phosphate Flux (g/m2/day) Legend Site 1 (i=116,j=33) Site 2 (i=114,j=45) Site 4 (i=97,j=36) Jul-Aug Apr-08 May-08 Jun-08 Jul-08 Aug-08 Sep-08 Oct-08 Nov-08 Dec-08 Jan-09 Feb-09 Mar-09 Apr-09 Time (days) N=17 reservoirs (Dzialowski & Carter, OSU)
18 How Well Did Lake Model Match Observed Data? Model generated seasonal stratification Good match to water temperature and dissolved oxygen Aug-2008 storm event reproduced Model matched seasonal trends of temperature, DO, secchi depth, nutrients & chlorophyll Sediment flux model SOD & internal load of P comparable to other Midwest reservoirs Model DO used to compute anoxic volume of lake as percentage for WQ target compliance
19 Management Scenario What-if Watershed 35% of TSS and nutrient (N,P) load is removed? Existing Loads Would lake attain WQ targets for turbidity, Chlorophyll & DO? Lake How long will it take to attain compliance with WQ targets? WQ Impairments Sediment flux model Spin-up runs, 8 years Watershed Reduce Loads Lake WQ Target Compliance
20 30 NTU Meets Turbidity Target < 25 NTU Turbidity 30 μg/l Meets Chl Target <10 µg/l Chl 10 mg/l 5 mg/l Meets DO Targets (a) Sfc DO > 5 mg/l (b) <50% Lake Volume can be < 2 mg/l Obs Cal Yr1 Yr4 Yr8
21 Sediment Flux: PO4 & SOD Calibration & 8 Yr Spin-up 6 mg P m -2 day -1 1 g m -2 day -1 Cal Yr1 Yr4 Yr8 Cal Yr1 Yr4 Yr8
22 35% Load Reduction & TMDL Based on spin-up, 35% load reduction should attain compliance with WQ targets Flow & TSS,BOD, N,P loads described by lognormal distribution Probability-based statistics of log-normal distribution of HSPF watershed loading data used to compute TMDLs TMDL computed from Long Term Average (LTA) load (35% R), CoeffVar, & 95% Confidence Interval
23 Maximum Daily Load,TP
24 Summary Calibrated Watershed-Lake model provided Oklahoma DEQ with technically defensible tool Literature used to help fill data gaps for sediment flux model 35% removal attains compliance with WQ targets for Turbidity, Chlorophyll & Oxygen Watershed-Lake model used to support TMDL Determinations for TN, TP, TSS, and BOD Lake Thunderbird TMDL approved by EPA Region 6 in Nov-2013
25 Lake Thunderbird Watershed-Lake Model Questions & Discussion Andy Stoddard Dynamic Solutions, LLC (540)
26
27 Sediment Bed C,N,P Data Gaps Sediment Flux Model needs NH4, NO3, TON, TOP, PO4, TOC for initial conditions Nitrogen TKN from OWRB NH4 = 1% TKN NO3 = 1% NH4 TON =99% TKN Phosphorus TP from OWRB TOP, PO4 = 50% TP (Nowlin et al.,2005,oh) Organic Carbon C:N = 15 (Kaushai & Binford, 1999, MA) TOC = TON * C:N
28 SOD: Observations vs. Model
29 Lake Model Performance Relative RMS Error (%) Parameter Number Data Pairs Relative RMS Error (%) Water Level % 20% Water Temperature 465 8% 50% TSS % 50% Chlorophyll % 100% Dissolved Oxygen % 20% Target Relative-RMS Error (%) Total-P % 50% Total-N % 50%
30 Total Maximum Daily Loads TMDL: kg/day Total-N Total-P BOD Sediment Existing, ,487 Load Removal 35% 35% 0% 35% Long-Term Average Load ,466 Coeff_Var (CV) TMDL ,481 76,951
31 References Di Toro, D.M Sediment Flux Modeling. Wiley Interscience, New York, NY. Dzialowski, A.R. and L. Carter (2011). Predicting internal nutrient release rates from Central Plains reservoirs for use in TMDL development. Final Report, Project Number: X , Dept. Zoology, Oklahoma State University, Stillwater, OK, Submitted to U.S. Environmental Protection Agency, Region 7, TMDL Program, Water Quality Management Branch, Kansas City, KS. Haggard, B.E. and J.T. Scott Phosphorus release rates from bottom sediments at Lake Wister, Oklahoma,Summer, Arkansas Water Resources Center-University of Arkansas, Tech. Pub. Number MSC 364-Year Kaushai, S. and M. W. Binford Relationship between C:N ratios of lake sediments, organic matter sources, and historical deforestation in Lake Pleasant, Massachusetts, US. Jour. Paleolimnology, 22: Nowlin, W.H., J.L. Evarts and M.J. Vanni 2005 Release rates and potential fates of nitrogen and phosphorus from sediments in a eutrophic reservoir. Freshwater Biology, 50, Veenstra, J.N. and S. L. Nolen In-situ sediment oxygen demand in five southwestern U.S. lakes. Water Research, 25(3):
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