Minimizing Long-Term Wind Set-Up Errors in Estimated Mean Erie and Superior Lake Levels

By Croley Ii, Thomas E.

Book Id: WPLBN0000662000
Format Type: PDF eBook
File Size: 636.74 KB.
Reproduction Date: 2005

Title:	Minimizing Long-Term Wind Set-Up Errors in Estimated Mean Erie and Superior Lake Levels
Author:	Croley Ii, Thomas E.
Volume:
Language:	English
Subject:	Science., Ecology & environment, National Oceanic and Atmospheric Administration (U.S.)
Collections:	National Oceanographic Data Center
Historic Publication Date:
Publisher:	Government Reference Publication


Citation APA MLA Chicago Croley Ii, T. E. (n.d.). Minimizing Long-Term Wind Set-Up Errors in Estimated Mean Erie and Superior Lake Levels. Retrieved from https://gutenberg.cc/

Excerpt
Excerpt: Minimizing Long-Term Wind Set-Up Errors In Estimated Mean Erie And Superior Lake. Errors in computed mean lake levels, caused by wind set-up, are estimated from linearized hydrodynamic shallow-water equations applied to Lakes Erie and Superior for historical and current gage networks. Observations of maximum unit error (that results from a unit wind stress) with each of the historical networks and with the current network are consistent with lake orientation and network placement considerations. Optimum network gage selections are made from the 16 available Lake Erie gages to minimize mean square set-up error estimated over one season's wind data, mean square total error estimated from daily data for 12 years, and mean square total error with constraints on the network size. Optimum network gage selections for Lake Superior are made from the 10 available gages to minimize mean square total error estimated from 12 years of daily data with and without constraints on the network size. It is not possible to eliminate wind set-up errors in mean lake levels if Thiessen weights must be used (although errors can be kept quite small); without this constraint, wind set-up errors can be eliminated from mean lake level computations. This allows selection of the weights that minimize other types of errors. The differences in net basin supply and lake volume computations that result by using optimum weights instead of Thiessen weights appear significant on both Lakes Erie and Superior.

Table of Contents
CONTENTS PAGE ABSTRACT....................................................................l 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. INTRODUCTION .......................................................... 1 LAKE ERIE ............................................................. 2 LONG-TERM LAKE ERIE SET-UP ERROR ...................................... 4 MINIMUM SET-UP ERROR FOR LAKE ERIE .................................... 8 TOTAL ERROR FOR LAKE ERIE ............................................ 11 MINIMUM TOTAL ERROR FOR LAKE ERIE .................................... 14 SPATIAL-OPTIMUM AND THIESSEN WEIGHTING DIFFERENCES FOR LAKE ERIE ..... 21 LAKE SUPERIOR ........................................................ 25 LONG-TERM LAKE SUPERIOR SET-UP ERROR ................................. 26 MINIMUM TOTAL ERROR FOR LAKE SUPERIOR ................................ 29 SPATIAL-OPTIMUM AND THIESSEN WEIGHTING DIFFERENCES FOR LAKE SUPERIOR ........................................................ 31 NET BASIN SUPPLY COMPARISONS ......................................... 35 smMARY .............................................................. 38 REFERENCES ........................................................... 40 iii





Science., Ecology & environment, National Oceanic and Atmospheric Administration (U.S.) The American Society of Limnology and Oc... (by Jumars, Peter A.) Physical Processes Affecting the Movemen... (by Overstreet, R.) Minimizing Long-Term Wind Set-Up Errors ... (by Croley Ii, Thomas E.) Marine Protected Areas Lesson Plan Prote... Archaeological Resources Protection Act ... 150 Years of Tides on the Western Coast ... (by Theberge, Albert E.) Dear Admiral Watkins and Members of the ... (by Sandifer, Paul A.) Marine Aquaculture in the United States ... (by Devoe, M. Richard) Management of Ocean and Coastal Environm... (by Poole, Richard) United States Department of Commerce Was... (by Gran, Sandra J.) Summary of Recommendations Exchange File Format