SPECIAL STUDIES AND ANALYSIS
3.2 Project details, goals and deliverables
This project is part of a climate change adaptation initiative that includes several phases. The first three phases of this initiative were undertaken in June 2017 and completed in June 2020. The reports of the previous phases are available on the website of the Chaleur Regional Service Commission. The goal of the project is to produce high quality geospatial data that will help identifying the coastal infrastructures and wetlands that will be at risk over the next decades due to coastal erosion
processes and coastline changes.
The study areas included in this project are:
1) the salt marsh system in Beresford, as well as the portion of this system associated with Peters River in Bathurst,
2) the cliffs and dunes along Nigadoo and salt marshes along Nigadoo River, and
3) the cliffs and dunes along Salmon Beach and Janeville.
The level of erosion risk will be evaluated based on:
1) the current position of coastal infrastructures, geospatial data that will be provided by the Chaleur Regional Service Commission, and
2) a projection of the historical rates of coastline change along the cliffs, dunes and salt marshes, and of shoreline change along the salt marshes,
The specific objectives of this project are:
1. Digitize with Arc GIS (version # 10.3.1) the position of the coastline and shoreline using the aerial photos of the 1930's or 1940's, 1970's or 1980's, and the orthophotos of the 2010's or 2020's, based on their availability and quality for the above-mentioned coastal areas.
The coastline and shoreline must be digitized with a precision of # 5 m on the oldest photos, # 4 m on the intermediate photos and # 3 m on the most recent orthophotos, in relation to their true position on the ground.
2. Calculate with USGS's DSAS module (Arc GIS extension) the mean annual rates of coastline
and shoreline change for the three longest periods covered by the selected aerial photos and orthophotos, for example:
# 1944 - 1985
# 1985 - 2018
# 1944 - 2018
Measurements of coastline and shoreline change must be done at an interval of 30 m and the transects used for measuring should not be too long and cross each other. The coastline and shoreline along salt marshes must be connected to create polygons; the pans and pounds that exceed 10 m in width or length and located inside the salt marshes must also be digitized in a way to create polygons.
3. Determine with Arc GIS the future position of the coastline and shoreline, in 2050 and 2100,based on a conservative scenario associated with the mean historical rate and pessimistic scenario associated with the standard deviation of this rate. The projection will be based on a methodology used during similar projects along the northeast coast of New Brunswick. The report of the Phase 1 study is available on the website of the Chaleur RSC at:
https://www.csrchaleurrsc.ca/docs/document/38/RegNord_EN.pdf.
The report of the Phase 2 will be available online after it has been received and approved by the Chaleur RSC.
4. The total area of salt marshes must be calculated for each study area and each period covered by the aerial photos and orthophotos. The total area of pans and pounds must also be calculated to better understand the marsh drowning phenomena associated with rapid sea-level rise.
Note:
Coastline is here defined as the limit of the large tide higher high water in situation of normal wave runup. Therefore, the coastline represents the limit of bedrock or unconsolidated cliffs, sand dunes or man-made coastal structures, as well as the limit of trees or slope breaks along salt marshes. Shoreline is here defined as the limit of the mean tide higher high water in situation of normal wave runup. Therefore, the shoreline represents the seaward limit of the schorre of the salt marshes,
in most cases the limit between Spartina patens and Spartina alterniflora.
Products to deliver at the end of the project are:
1. Arc GIS (version # 10.3.1) layer presenting the following information:
- Orthophotos used for the georeferencing and mapping work;
- Rectified aerial photos used for the mapping work;
- Baselines and transects used for calculating the rates of change;
- Coastlines and shorelines used for calculating the rates of change;
- Projected coastlines and shorelines based on pre-approved scenarios.
- Limit of pans and pounds inside salt marshes.
2. Arc GIS (version # 10.3.1) database presenting the following information:
- ID numbers of the transects used for calculating the rates of change;
- X and Y coordinates of the intersection point of transects with coastlines or shorelines;
- Type of coastline at intersection points (e.g.cliff, dune);
- Presence of coastal protection structure at intersection points (yes or no);
- Rates of mean annual coastline change along transects;
- Rates of mean annual shoreline change along transects;- Margin of error associated with the coastline and shoreline rates of change;
- Total area of salt marshes, and of pans and pounds inside salt marshes.
Note:
The geospatial data produced in this project must follow the standards established by Service New Brunswick, and be based on the Canadian Spatial Reference System ("North American Datum 1983") and a map projection adapted to the province's territory ("Stereographic Double").
3.3 Deliverables
All documents, reports, studies and analysis containing text, tables, graphs and data must be submitted in both official languages and in a format that can be read and edited with software of the Microsoft Office Suite for Windows, i.e. Word,Excel and PowerPoint, and with Arc GIS (version# 10.3.1)
The consultant shall submit the progress reports and the final draft report as follows:
- 7 hard copies in French,
- 3 hard copies in English,
- One electronic copy of all documents in French and in English on an external storage media in Word and PDF formats.
The consultant shall submit the final report as follows:
- 5 hard copies in French,
- 5 hard copies in English,
- One electronic copy of all documents in French and in English on an external storage media in Word and PDF formats.
The final report shall contain an executive summary. The final draft report shall be submitted to the Committee at least ten (10) working days before the commission
This is a tender notice only. In order to submit a bid, you must obtain official tender documents from the New Brunswick Opportunities Network, another authorized tendering service or as indicated in the tender notice.
