SANDWATCH PROJECT

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SANDWATCH PROJECT

• AVARUA SCHOOL
• GRADE 6
• 2007

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AIM

• TO FIND OUT HOW HUMAN IMPACTS,
  AFFECTS OUR BEACH.

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NGATIPA BEACH
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HYPOTHESIS

• BEACH COMPOSITION
• Measuring Beach Sand Shape and Sorting
• Finding out where Beach material comes from
• WATER QUALITY
• Measuring the Water Quality

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EROSION AND ACCRETION

• Measuring Erosion and Accretion over time
• Determining the effects of man-made structures on
  erosion and accretion

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Measuring beach sand shape and sorting

• Sand samples were collected from different points
  of the beach. In addition, the samples were
  collected from near-land, middle and near water.
  Then we allocated them into two groups shape and
  sorting.
• The shape of the sands or gravels relates to
  whether the individual sand and rock are angular
  and pointed or whether they are smooth and
  rounded. This shows how it is moved around by the
  waves, which makes them to become rounded with
  very few sharp points.
• The sorting out of the sands and gravels relates
  to the mixture of sizes. For example if all sand
  grains are the same size (mostly small big),
  then the sample is well sorted. If there are a
  lot of different sizes of sands and gravels (
  mixture of small, medium and large), then it is
  poorly sorted. If all the sand and gravels have a
  mixture of medium and small or large and medium,
  then it is moderately sorted. When the sand is
  moved about by the waves, it tends to get better
  sorted. In other words all the sand grains are
  about the same size.

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AREA A
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AREA B
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AREA C
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BEACH COMPOSITIONFIND OUT WHERE BEACH MATERIALS
COME FROM

• A beach contains loose material of varying sizes.
  The actual material itself can tell a lot about
  the stability of the beach.
• Samples of the sands were collected from the
  three allocated areas. The sand samples were
  categorized in accordance to Color and Texture.
• Area 1 Whatever Beach
• Color White and Black grain sand with a mixture
  of broken shells and gravel like stones included
  in the natural beach sand.
• Texture Hard
• Area 2 Orometuas Beach
• Color Similar to that of Area 1
• Texture Hard

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Area 3 Paradise Inn - Color White -
Texture Soft.We believe that Areas 1
2s sand collection was carried down from inland
rocks by the river current and the long shore
current. In Area 3, we believe that the white
sand came from the reef and limestone coral
battered down by the waves.
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Measuring Water Quality

• Ask for assistance from the Ministry of Marine
  Resources
• Wade into the sea to measure the quality of the
  water
• Take results for the readings
• Table results on a chart and create a line graph
  to show results
• Visit to the Ministry on how they find out about
  the Bacteria Entrococci in the water

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WATER QUALITY RESULTSTEMPERATURE
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DISSOLVE OXYGEN (mg/L)
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DISSOLVED OXYGEN (Saturation )
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SALINITY
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Entrococci Results

• The two day visit to the Ministry of Marine
  Resources, was spent looking at how they collect
  and analyze the Bacteria Entrococci in 3
  different samples of water i.e. Marine, UV
  treated and Non UV treated. It is then left to
  grow over night before it is counted. The final
  result was inconclusive due to large amount of
  bacteria found in the water. However, we had to
  consider the fact that the water samples were
  collected during rainy period.

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EROSION ACCRETION

• Measuring the beach over a period of 6 weeks,
  every Friday.
• 3 Points were measured labelled as A, B, C
• Area A Whatever Bar Beach
• Area B Orometuas House Beach
• Area C Paradise Inn Beach
• In each area, three points were measured and
  labelled as points A1, A2 ,A3 / B1, B2, B3/ C1,
  C2, C3.

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Results of the measured beach
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Determining the effects of man made structures on
erosion and accretion.