Posted by: richardkirk | February 20, 2013

crane poster

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Posted by: richardkirk | February 13, 2013

Berrow Conservation Group meet regularly at Berrow Village hall, for more details about the hall and its facilities please visit here

Posted by: richardkirk | February 7, 2013

crane projet

Posted by: richardkirk | December 4, 2012

OWL POSTER

OWL POSTER

Posted by: richardkirk | March 10, 2012

Posted by: richardkirk | October 27, 2011

Diary of Forthcoming Events

Our next meeting will be held on Tuesday 22nd November 2011 in Berrow Village Hall at 7.30pm.  Our guest will be John Buttivant who is a Coastal Engineer with the Environment Agency.  We will discuss erosion of our sand dunes,  the measures currently taken by the group, and the Environment Agencies plans for our area.   Guests are very welcome to attend.

Posted by: richardkirk | August 12, 2011

Dune Monitoring

INTRODUCTION

The Berrow Conservation Group (BCG) was requested by the Local Nature Reserve Steering Committee (LNRSC) to monitor dune erosion along that part of the beach to the west of, and which borders with, Berrow Dunes Local Nature Reserve (LNR). For the purposes of this exercise, erosion will be defined as the inward (easterly) movement of the point at which vegetation generally begins to grow.

A very convenient reference point from which to measure this erosion is the existing row of posts which runs north – south along the beach for the length of the LNR, and beyond it.  (These posts were originally erected to prevent parked cars encroaching on the dunes, and are shown below) 

MARKING THE POSTS

It was agreed with the LNRSC that measurements be taken at 10 metre intervals (approx.). The posts from which measurements are to be made are not spaced at regular intervals, but are generally about 3 to 4 feet apart. It was therefore necessary to measure and mark appropriate posts at 10 metre intervals, for identification, starting at one end of the LNR, and working towards the other – in our case, from south to north. The method of marking, we agreed, must be unobtrusive, but of as permanent a nature as possible, bearing in mind the conditions to which the posts are subjected (wind, sea  etc), and the possibility of vandalism. For this reason, two separate methods of identification were devised, one using black and white cable ties, plus a back-up method using staples (horse-shoe shaped nails) and/or washers. A code was devised whereby each of the appropriate posts could be identified.  The code is not explained in this blog, but is not secret and details would be supplied on request. For interest, however,  photos of two posts showing ties and nails etc are shown below.  


The picture above shows two black cable ties around the post and two washers nailed into the top of the post

This picture shows two white cable ties, and identifies the position, where measurements start.  This post was originally a metre high, and is now only about 400mm. Some of our posts have been competely covered due to the shifting sand

TAKING MEASUREMENTS
The length of beach to be monitored is 680 metres long, and measurements are made at 10 metre intervals; hence 68 individual measurements in total are taken. Measurements are made from the marked posts, inland, and at right angles to the row of posts, to a position where vegetation generally starts to grow. Results are measured in metres.
Readings are taken twice a year, April and October, as soon after high tide as possible. By comparing subsequent results, we can measure any movement of the dune/beach interface twice yearly.    
By comparing the latest results with the first taken in 2009 we can measure the trend over longer periods. 
Graphs are produced in Excel, and display virtual plan views of the coastal strip, making interpretation of our results very easy to understand

Click once on the graph below to give a full screen view 

INITIAL RESULTS 2009

Our next graph shows the results of measurement made six months later, superimposed on the original results shown above.

 

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