Presentation on theme: "Keweenaw North Waterway Buoy Bob Shuchman: Colin Brooks: Nate Jessee:"— Presentation transcript:
Keweenaw North Waterway Buoy Bob Shuchman: email@example.com@mtu.edu Colin Brooks: firstname.lastname@example.org@mtu.edu Nate Jessee: email@example.com@mtu.edu www.michigantechlakesuperior.org www.mtri.org 1
The Keweenaw Waterway North buoy gathered data from 7/9/2010 through 10/11/2010. Data is located at www.michigantechlakesuperior.org www.michigantechlakesuperior.org A limited selection of records were removed for pre- deployment recording and sensor errors. Data presented here represents dates from 7/9/2010 through 10/10/2010. Two of the parameters collected were wind direction and wind speed. This data was organized to determine the frequency, duration, and strength of winds moving off shore (from land to water) and on shore (from water to land). 2
3 For all records spanning from July 9 th through October 10 th 2010, wind speed measurements were recorded every ten minutes. During this time span, wind speeds were less than 2 m/s for 11.41% of all records and wind speed was equal to zero for 0.07% of all records.
On shore and off shore winds are characterized based on the buoy location and the direction of the land. Wind direction is absolute in that it indicates the direction that wind is moving towards. On shore events are defined by consecutive recordings of winds with a direction between 45 and 225 degrees where 360/0 is north and 180 degrees as south. 45 225 On Shore Direction 4
Off shore events are consecutive recordings with a direction greater than 225 and less than 45 degrees where 360/0 is north and 180 degrees is south. 45 225 Off Shore Direction 5
59.5% 7 The frequency of wind direction recordings described as either off shore or on shore, a total of 13453 records were taken from July 9 th to October 10 th. Count of Recordings
8 Hours Max 10.83 m/s Description of off shore wind events, described by duration of events in hours. *Events are defined as time periods greater than 10 minutes where wind is consistently moving in the on or off shore direction.
9 Wind Speed, m/s Summary of all off shore wind speeds for all off shore events.
10 Hours Max 5.92 m/s Min 4.32 m/s Ave. 4.98 m/s Description of on shore wind events, described by duration of events in hours. *Events are defined as time periods greater than 10 minutes where wind is consistently moving in the on or off shore direction.
11 Wind Speed, m/s Summary of all on shore wind speeds for all on shore events
13 Wind Speed, m/s Represents all wind speed records for all events categorized as on or off shore
Started on September 11 th at 7:30 p.m. and lasted through September 15 th at 1:00 a.m. Lasting a total of 77 hours, 30 minutes. The event had the following characteristics: Average wind speed: 8.07 m/s Minimum wind speed: 5.31 m/s Maximum wind speed 10.83 m/s The following slide represents the temporal distribution of wind speed. 14
*Wind Directions indicate the actual direction that wind is moving * 16 Wind Direction
17 Wind Speed, m/s Represents all records from July 9 th through October 10 th.
18 Wind Speed, m/s Represents all records from July 9 th through October 10 th and highlights the major off shore event
High Frequency (HF) Radar is sensitive to dominant wave period length. Wave periods of small length, less than 2 seconds for example, may be unnoticed by HF Radar. An analysis was performed to determine how frequently the dominant wave period dropped below a specific value. Each event was also characterized by the length of time the wave period value was below the threshold. 19
For all records spanning from July 9 th to October 10 th, dominant wave period measurements were recorded every ten minutes. The dominant wave period had a value of zero second for 0.01% of all records. Also, dominant wave period value was less than 2 seconds for 15.98% of all records and greater than 5 seconds for 16.03% of all records between July 9 th and October 10 th. 20
21 This graph represents 15.98 % of all records from July 9 th through October 10 th. Count of Events
22 This graph represents 3.95 % of all records from July 9 th through October 10 th. Count of Events
23 This graph represents 0.01 % of all records from July 9 th through October 10 th. Count of Events