SEFA - SYSTEM FOR ENVIRONMENTAL FLOW ANALYSIS
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1 SEFA - SYSTEM FOR ENVIRONMENTAL FLOW ANALYSIS COMPUTER SOFTWARE BASED ON THE INSTREAM FLOW INCREMENTAL METHODOLOGY Presented to AWRA Environmental Flow Conference Hartford, Connecticut June 24 25, 2013 By: Thomas R. Payne Ian G. Jowett
2 ENVIRONMENTAL FLOW - DEFINITION Minimum Flow Base Flow Instream Flow Ecological Flow Required Flow Environmental Flow E-flow Environmental Flow: Environmental flows are the quantity and timing of water flows required to maintain the components, functions, processes, and resilience of freshwater ecosystems and the goods and services they provide to people. AWRA
3 ENVIRONMENTAL FLOW METHODS Pre-1960 Hydrologic, typically 7Q Baxter Percentage of Mean Annual Flow 1972 Washington Habitat Area Method 1975 Tennant Percentage of Mean Annual Flow 1976 Waters Habitat-Discharge Method 1977 Instream Flow Incremental Methodology Methods Methods 2002 Over 200 Methods 2012????
4 IFIM SCHEMATIC 1982
5 IFIM SCHEMATIC Determine physical microhabitat available with and without project
6 IFIM SCHEMATIC 1998
7 IFIM SCHEMATIC 1998 Microhabitat suitability criteria Channel structure Hydraulics Microhabitat area per unit length of stream
8 TYPICAL IFIM APPLICATIONS Step One PHABSIM Step Two PHABSIM Step Three PHABSIM Infrequently: Water Temperature Modeling Time Series Analysis
9 CONSEQUENCES IFIM is equated with PHABSIM IFIM inappropriately criticized Alternative methods multiply Analysis becomes fragmentary Study integration weakens Resource protection suffers
10 WHY IS THE FULL IFIM SO RARE? Schematics are too complicated? Projects won t pay for it if agencies don t require it? Only fish people know about it, while other disciplines use their own methods? There is little current training in the IFIM?
11 THE NUMBER ONE REASON No software was ever written to guide and implement the full IFIM, only: LIAM PHABSIM TSLIB SNTEMP/SSTEMP
12 CURRENT SITUATION Instream Flow Group transitions PHABSIM updated but not supported RHABSIM needs updating Other software programs not widely adopted IFN methods are proliferating and diverging instead of converging
13 SEFA: SYSTEM FOR ENVIRONMENTAL FLOW ANALYSIS By: Ian Jowett (RHYHABSIM) Robert Milhous (PHABSIM) Thomas Payne (RHABSIM) Juan Manuel Diez Hernández
14 SYSTEM FOR ENVIRONMENTAL FLOW ANALYSIS Merges PHABSIM, RHABSIM, and RHYHABSIM Based on IFIM schematic and includes numerous analytic modules User-friendly format, menu-driven, abundant graphics, interactive help files Allows import/export of multiple instream flow methods to incorporate alternative analytical approaches
15 ELEMENTS OF SEFA Hydrologic Analysis (IHA and Time Series) Hydraulic Habitat Analysis (1D and 2D import) Habitat Suitability Criteria (HSC) Water Temperature Modeling (network, reach) Water Quality Modeling (D.O., dilution) Sediment Analysis (flushing, transport, deposition) Riparian Vegetation Analysis (inundation, scour) Habitat Duration and Time Series Legal-Institutional Analysis (LIAM)
16 IMPLEMENTATION OF SEFA Completely open to user choice: Start from the first module Start anywhere within the program Select modules to run or not run Use alternative models and return with data Link results from different modules Habitat analysis with water temperature Combine 1D and 2D habitat modeling
17 OPENING SEFA SCREEN SHOT
18 CROSS SECTION PROFILE AND VELOCITY
19 ISOMETRIC VIEW OF CROSS SECTIONS
20 REACH PLAN VIEW OF CROSS SECTIONS
21 STAGE-DISCHARGE RATING CURVES
22 WATER VELOCITY CALIBRATION
23 FLOW TIME SERIES
24 AREA WEIGHTED SUITABILITY TIME SERIES
25 AWS EVENT ANALYSIS BY TIME PERIOD
26 SEDIMENT FLUSHING FLOW ANALYSIS
27 DOWNSTREAM WATER TEMPERATURE
28 DISSOLVED OXYGEN MODELING
29 HYDRO OPERATIONS ANALYSIS /1/2013 3/1/2013 5/1/2013 7/1/2013 9/1/ /1/2013 1/1/2014
30 MAINTENANCE OF SEFA Supported by not-for-profit corporation (Aquatic Habitat Analysts, Inc.) Interactive web site for version upgrades, bug fixes, user comments, and suggestions Documentation and training available Distributed for a nominal cost Continuous improvements, including links and incorporation of new features
So which approach, the holistic-integrative, or the comprehensive-analytic, is better for addressing uncertainty?
Tom Payne Intro TOM PAYNE: All right, thank you. Thank you, Thom [Hardy]. And thank you, the other Tom [Annear] and to the Instream Flow Council, for inviting me to appear before this august assemblage.
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