Monday, February 7, 2011

Evolution of the Western Stege Marsh, Part 2

In my last post, I linked the Hydrologic Monitoring Report obtained by the Richmond Field Station and included Figure 18, which shows the extensive tidal channel networks on the Conner site as of 1996.  I thought it might be wise to see what the tidal channel network looked like closer to April 13, 2003, the date Conner was found (allegedly washed ashore), and January 10, 2004, the date People's 100 was taken.

Google Earth (the free version) has an aerial it says is dated October 10, 2003*, which very clearly shows the tidal channel network in the northern 3/4 of the site.  The site appears to be under a high tide as the channels are quite full.  This is the High/Low tidal data for October 10, 2003.  5.82 feet is 6/10 of an inch below 5.87 feet, the verified HH water level on April 13, 2003.

Historic Tide Data

Station Date      Time Vrfy HL
DCP#:                        1
Units:                    Feet
Data%:  MLLW     Local   1.667  
Maximum:                  5.82  
Minimum:                  0.62  
------- -------- ----- ------- 
9414863 20031010 00:42    5.22  H
9414863 20031010 06:12    0.99  L
9414863 20031010 12:42    5.82  HH
9414863 20031010 18:54    0.62  LL
I've also attached a Google Earth aerial at a lower tide so you can see the difference in the channels at the different water levels.


This is the High/Low Tidal data for March 5, 2003*.  

Historic Tide Data

Station Date      Time Vrfy HL
DCP#:                        1
Units:                    Feet
Data%:  MLLW     Local   1.667  
Maximum:                  5.53  
Minimum:                  0.84  
------- -------- ----- ------- 
9414863 20030305 01:36    5.53  HH
9414863 20030305 07:18    1.39  L
9414863 20030305 13:30    5.27  H
9414863 20030305 19:18    0.84  LL
(*Google Earth does not certify that the imagery dates are correct.)  

2 comments:

Bruce Dombrowski said...

(*Google Earth does not certify that the imagery dates are correct.)


Tese are not reliable at all, I recall looking at my mothers house with ehr, and trying to tell her that it was on a certain date, but she informed me that the tan Buick was in the driveway, and they had gotten rid of it over a year prior to that date....still neat to look at...

Marlene Newell said...

Street views in Google Map are not current -- they are from old aerials. And they will stay up for quite some time. However, the aerials are supposed to be at least in a date range. Google Earth sometimes gives Oct 9, 2003 as the date for this image,and sometimes Oct 10. Oct 9 is interesting because its HH tide was exactly 5.87. Terra Server claims that it's imagery dates are correct, but they do not always have the same aerials as Google Earth.