““Beach recreation planning using video Beach recreation planning using video systems for coastal stability problems on systems for coastal stability problems on

natural beaches”natural beaches”

University of Cantabria (UCa)University of Cantabria (UCa)

““Beach recreation planning using Beach recreation planning using video systems for coastal stability video systems for coastal stability

problems on natural beaches”problems on natural beaches”

1.1. Issues and necessitiesIssues and necessities

2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity

3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”

4.4. Methodology and algorithm usedMethodology and algorithm used

5.5. Results and discussion Results and discussion

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussion Results and discussion

Beach services

Beach accesses

Lifeguard stations Security sign

Beach user density

Spatial and temporal distribution

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussion Results and discussion

The beach carrying capacity can be analysed The beach carrying capacity can be analysed from many different parametersfrom many different parameters

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussion Results and discussion

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussion Results and discussion

Video imageryVideo imagery15 Jul 2003 – 15 Sep 200315 Jul 2003 – 15 Sep 2003

ArgusDB

Main Access to the beachMain Access to the beach

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussion Results and discussion

Area Area SelectedSelected

DN1

DN4

DN7

DN2

DN5

DN8

DN3

DN6

DN9

AVEA = (DN1 + DN3 + DN7 + DN9)/4

AVEB = (DN2 + DN4 + DN6 + DN8)/4

DIFF = | AVEA - AVEB |

THRESH = DIFF X WEIGHT

IF : |DN5 – AVEA| or |DN5 – AVEB| > THRESH

THEN:

Is counted

The kernel algorithm employing a NxN (e.g. 3x3) pixel neighborhood The kernel algorithm employing a NxN (e.g. 3x3) pixel neighborhood

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussion Results and discussion

The kernel is moving The kernel is moving around selected areaaround selected area

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussion Results and discussion

C3, Sat – 9/Aug/2003, 13:10C3, Sat – 9/Aug/2003, 13:10

The spatial distribution of The spatial distribution of beach user was found after beach user was found after the algorthm was appliedthe algorthm was applied

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussionResults and discussion

With the data of beach user position With the data of beach user position was estimated the distance from the bridge to each personwas estimated the distance from the bridge to each person

Histogram of walking Histogram of walking distances from beach distances from beach access to sunbathing place access to sunbathing place on August 2003.on August 2003.

The peak is ~ 150 mThe peak is ~ 150 m

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussionResults and discussion

Distance from the main access (m)

Log-normal Log-normal distributions of distributions of optimal distance from optimal distance from shoreline on August shoreline on August 9, 20039, 2003

The peak is ~ 50 mThe peak is ~ 50 m

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussionResults and discussion

Distance from shoreline (m)

1.1. Issues and necessitiesIssues and necessities2.2. Estimation of beach carrying capacityEstimation of beach carrying capacity3.3. Video-derived CSIs at “El Puntal”Video-derived CSIs at “El Puntal”4.4. Methodology and algorithm usedMethodology and algorithm used5.5. Results and discussionResults and discussion