what does it all mean siletz river near siletz, or may 20-23, 2013
TRANSCRIPT
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What Does It All Mean
Siletz River near Siletz, OR
May 20-23, 2013
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What we learned this week• Why & where we might collect sediment data
• How sediment is transported by water (fluvial)
• How the samplers work, (the 0.4 rule, isokinetic)
• Sed conc (mg/l) and discharge (tons/day)
• Under what conditions each sampler can be used (high vs low flow, Q vs sed peak)
• Sed sizes can vary in X-sec– pebbles,sand,silt,clay– In vertical and width
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What we learned this week (cont)
• How to collect – Suspended-Sediment Samples– Bed Material (pebble counts with MacKenzie)
• Equal-Width-Increment (EWI) sampling• Equal-Discharge-Increment (EDI) sampling• Sampling sets A & B for QA/QC• Analyze individual or composite• Representative sample
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What we learned this week (cont)
• Wading versus bridge sampling• Use of 4-wheel crane & bridgeboard with D-74 &
DH-76 --- Quart jars, green and red nozzles• Use of hand-line with DH-59 (pint jars)• Suspended load vs bedload (ewi & unequal-wi)
– (Qb (tons/day/ft) = K (grams/sec/ft to tons/day/ft) * drymass (grams) / time (sec)
• We need more collaborative discussions
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What’s Next• Take this information and apply to your
situations in your work
• Determine what the problem is (define objectives)
• Determine how to collect the best data
• Estimate and reduce the errors
• Contact us with any questions
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THIS MEANS THAT YOU WILL HAVE TO THINK
ABOUT WHAT YOU ARE DOING IN THE FIELD.
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IF THIS IS YOUR PROBLEM
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DO YOU COLLECT SAMPLES WITH THIS?
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THINK ABOUT THESE SITUATIONS
• NON-MIXED STREAMS
• BRAIDED CHANNELS
• REVERSE FLOW
• URBAN vs RURAL STREAMS
• DEPTHS OVER 15’
• PARTICLE SIZE OF SEDIMENT
• BEDLOAD vs SUSPENDED LOAD
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That’s it- you folks were great
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The Siletz CallTutuni, Chinook and Kalapuyawe hear your callHigh from the treetopsthe eagle is tall
The Siletz rolls and rumblesthrough terrain ancient and wildYet peaceful enoughfor even a child
We thank you mighty oneFor this lookand hope we give backMore than we took