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Climate Change Vulnerability Assessment and Adaptation Planning ...

Climate Change Vulnerability Assessment and Adaptation Planning ...

3.0 Conducting a

3.0 Conducting a Vulnerability Assessmentreplicate measurements, taking several at differentlocations along the seaward edge, for example. Theelevation to measure is the average mud surface levelinside the mangroves – the level that is influencingtidal inundation frequency.At the seaward edge (d1), mud levels will slope downon the edge of a creek bank; so go a few meters insidethe mangrove trees where the mud levels are flatter.Also, because crab activity will cause mud levelvariation, look for areas that are undisturbed by crabs.Data sheets are provided in the Appendix. The waterdepths in the mangroves must be recorded at theexact same time that an observer records the waterdepth at the reference station (h). Depths in themangroves can be recorded at different times by thesecond person/group, so long as a correspondingmeasurement for each is taken at the same time at thereference station. Corresponding time measurementscan be communicated by radio or mobile phone, ormeasurements can be taken at prearranged times, suchas every 10 minutes.Water depths should be measured in mm, using a stifftape or survey pole held vertically in the water to theaverage mud level (Figure 28). If the water is deep andturbid, quickly take several measurements at differentplaces and record an average level.If communication is by phone or radio, the locationcolumn at the reference station can be filled outwith the site where the other person is measuring,as communicated at the time by phone or radio. Ifregular times (such as every 10 minutes) are used formeasurements, the time column should be agreedbefore the fieldwork starts, and watches should bechecked so that they are synchronized.Elevation surveys above tidal levels can only be doneusing high-technology techniques described in theprevious subsection, such as dGPS or LiDAR, due tothe lack of tidal water. Such elevation surveys abovetidal level provide useful information for adaptationplanning, as they can identify potential migrationareas for mangroves with predicted relative sea levelrise. A case study from Tanzania included earlier inthis subsection shows the value of such surveys foradaptation planning.Photo: Gordon Ajonina, Cameroon Wildlife Conservation SocietyHow to analyze resultsTo interpret elevation (E) of a mangrove location (d)when measurements are taken at the same time:E = h - d (for each mangrove station such as d1, d2, d3, etc.)To interpret elevation (E) of a mangrove location (d)when measurements are taken at different times:E = h1 - d1 (for each mangrove station when h and d areboth measured at the same time)It is crucial that the same (h) survey stake is used forthis calculation.As shown in Figure 26, if the reference station (h)can be related to the mean sea level (MSL) of thelocal survey datum, elevation results can be describedFigure 28. Recording water depth at sample sites (d)within the mangroves at the same time as ameasurement is taken at the reference station (h).Climate Change Vulnerability Assessment and Adaptation Planning for Mangrove Systems | 47

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