FE 423 - Watershed Analysis Lecture 1a - Overview Finn Krogstad UW Forest Engineering .
FE 423 - Watershed Analysis Lecture 1a - Overview
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Transcript of FE 423 - Watershed Analysis Lecture 1a - Overview
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FE 423 - Watershed AnalysisLecture 1a - Overview
Finn KrogstadUW Forest Engineering
http://students.washington.edu
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OVERVIEW• why -• what -• when -• where - • how -• who -
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EARLY MANAGEMENT• Management was done with little
consideration of environmental impacts
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Early Regulations• Case-by-case evaluation of roads, harvests,
and locations
• Still dominates forest management today
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Watershed AnalysisAPPROACH - basin specific•where are the hazards•what are they sensitive to•will they reach the stream•are there sensitive reaches•are vulnerable fish there•do inputs exceed background
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Watershed AnalysisPROBLEMS•Massive expert time•Site-by-site investigation •Stop being watershed specific•Site, not landscape plans•Is plan A worse than plan B?
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Goal: Comparing Landscape Options
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OVERVIEW• why - spatial approach • what -• when -• where - • how -• who -
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WATERSHEDS
• Spatial Heterogeneity
• Water Flows Downhill
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EACH POINT HAS UNIQUE:• Vegetation• Soil• Slope• Aspect• Upslope Area• Distance to Stream• Management
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‘DOWNHILL’ IMPACTS• Saturating Hillslopes• Erosion Runoff Filtering• Stream Flow Volumes• Stream Width & Depth• Sediment Supply• Fish Habitat
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WE NEED1a. Data for each point in the watershed1b. Calculate processes at each point2a. Sum outputs from upslope area2b. Sum ‘delivery costs’ to stream
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Spreadsheets - The Most Powerful Scientific Tool Ever Developed
1. Bring in data2. Run calculations3. Display results
Originally was:Programming for Accountants
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GRID: the Spreadsheet for Landscapes
1. Bring in spatial data (soils, vegetation, topography, )
2. Run equations3. Display results
ArcView: not just pretty pictures
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Watershed Analysis: in GRID
•data for each point•calculation at each point•… along path to the stream•accumulating upstream inputs•accumulating different inputs•compare management plans
Gridding the World
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OVERVIEW• why - spatial approach • what - downhill in GIS• when -• where - • how -• who -
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SCHEDULETuesday Thursday
Grid Basics overview spatial datadigital topography surface functionsgrid algebra grid functions
Grid Hydrology Exam I flow directionflow accumulation path lengtheuclidian/costpath vehicular trafficwildlife movement Exam II
Grid Watersheds mass wasting surface erosionhydrology channelsriparian fish
Finals Week Final Exam
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OVERVIEW• why - spatial approach • what - downhill in GIS• when - schedule• where - • how -• who -
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SYLLABUS
OSB
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OVERVIEW• why - spatial approach • what - downhill in GIS• when - schedule• where - OSB 111• how -• who -
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SYLLABUSInstructors: Finn Krogstad, Peter Schiess
Grading:FE423: three exams (33% each)FE523: three exams and a project (25% each)
Lectures: Tuesday & Thursday, 9:30-11:20, in OSB 111 (except first day in AND 302)
Exams:Each exam will include an in-class and a take-home part. The in-class part is open book, open note, pencil-and-paper discussion of grid-based solution of watershed problems. The take-home part which will require solution of problems.
Practice Problems:Each lecture will include a set of problems to provide hands-on experience in the grid-based approach to solving watershed problems. These problems are not handed in, but the exams will look much like these problems, and will assume that students have completed all problems.
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READINGS• Hard copy of the online help
Cell Based Modeling with GRID• People without ArcView experience
Getting to know ArcView GIS• Another view of Spatial Analyst
Extending Arcview GIS • Some Hydrology and Geomorphology
Water in Environmental Planning, Watershed Analysis Manual (WFPB)Geomorphology (Chorley, et al)
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OVERVIEW• why - spatial approach • what - downhill in GIS• when - schedule• where - OSB 111• how - syllabus• who -
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Why Watershed Analysis in GRID?
PROBLEMS• not a survey class: an approach, not ‘facts’• learning GIS: requires work• existing software: more accurate ‘black boxes’
ADVANTAGES• quantitative approach: actually ‘say something’• insight into process: applicable to many issues• GIS skills: applicable to other types of problems
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Should you take this course?
• Spatial Hydrology• Landscape Scale• More GIS
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Discussion Problems:for Thursday, try and be ready to discuss the following
Make a spreadsheet that will estimate the peak flow Q5=.157*A.9*Pa1.35*F-.21 for a five year storm in Region XII, using a table of road crossings with their respective contributing area A, percent forest cover F, and annual rainfall Pa.