Output for manuscript

Purpose: Make charts for an article about the experience of EPFL students and beach litter surveys.

Background: This is in the context of the global movement to reduce plastic debris in the maritime environment. Riverine inputs are major contributors of plastic debris (and all types of refuse) to the oceans. This parts of an analysis of the data collected on the shores of Lake Geneva over a three year period. The maritime protocol was modified in very specific ways to adjust for the local geography and population density.

From previous notebooks in this repo:

  1. The data was collected at different locations
  2. The data was collected by different groups of people
  3. For each year there is one group that collected 50% or more of the samples
  4. The mean for each year is 9pcs/m +/- 1
  5. The median for each year is 5.5pcs/m +/- 1.3
  6. The numnber of samples for each year is different
  7. Each year has a geographic center
  8. All the particpants recieved training on a standardized protocol

The survey totals, in pieces of trash per meter, can be summarised as follows:

Statistic Year one Year two Year three Combined
Samples 83 41 24 148
mean 8.77 9.99 9.01 9.16
median 4.83 6.84 4.24 5.52
Std dev 9.92 8.52 16.14 10.75
25\%ile 3.113 4.41 2.36 3.18
75\%ile 10.405 12.35 7.79 11.24
Minimum 0.68 0.57 0.11 0.11
Maximum 50.075 39.54 77.05 77.05
MCBP samples 80 22 5 107
SLR samples 0 18 15 33
EPFL samples 2 2 2 6
PC samples 0 0 2 2 
Directory already in place

Cumulative results Lac Léman Nov 2015 - Nov 2017

Cumulative results Saint Sulpice and Parc Parc-des-Pierrettes

The top ten Plage de Saint Sulpice

The top ten Parc des Pierrettes

Material Parc des Pierrettes

Material Saint Sulpice

Source Parc des Pierrettes

Source Saint Sulpice

Results on the day of interest

Top ten Parc des Pierrettes

Top ten Saint Sulpice

Materials Saint Sulpice

Material Parc des Pierrettes

Source Saint Sulpice

Source Parc des Pierrettes