puerto galera watersheds
TRANSCRIPT
Puerto Galera WatershedsPuerto Galera Watersheds
• Increasing population• Tourism boom
• Increased demand for resources ( e.g. land, water, food)
• Land use / cover change
• More wastes generated
How can watershed How can watershed modeling help modeling help Puerto Galera?Puerto Galera?
• Assessing water supply potential
• Quantifying material fluxes, also from built-up areas
• Assessing the effect of clear-cutting and deforestation
• Evaluating risk of flash flooding
White Beach
forest 2005deforested 2005 (from 2001)
Puerto Galera Watersheds
Balatero Balatero watershedwatershed
Aninuan Aninuan watershedwatershed
SRTM 3” DEM
Balatero WatershedBalatero Watershed
Present Land Cover
21798, 9%
155513.5,63%
67975.6,28%
All Forest
153380.5, 63%
58932.5, 24%
33017, 13%Interception
Infiltration
Discharge
All Bare
0, 0%
143191.9, 58%
102070.9, 42%
Present LCPresent LC All ForestAll ForestAll BareAll Bare
Balatero WatershedBalatero Watershed Hydrographs
0
5
10
15
20
25
0 50 100 150 200 250 300 350 400
minutes
cms
All Forest
All Bare
Present Land Cover
Present LC
Rapid increase in stream dischargeHigh peak discharge
All ForestAll Bare
Gradual increase/decrease
in stream discharge
More gradual increase/decrease in stream dischargeLow peak discharge
Aninuan WatershedAninuan Watershed
All Forest92719.4,
24%
210190.2,54%
83046.3,22%
All Bare
0, 0%
222042.7,58%
163805.8,42%
Interception
Infiltration
Discharge
Aninuan Watershed Hydrographs
0
5
10
15
20
25
30
35
40
0 50 100 150 200 250
minutes
cms
All ForestAll Bare
Aninuan Watershed
Aninuan Watershed
Anin
uan
Wat
ersh
edAn
inua
n W
ater
shed
All BareAll Bare All ForestAll Forest
Conclusions
• Long-term continuous monitoring reveals discharge dynamics not adequately captured by intermittent grab sampling
• Land cover composition and landscape patterns have significant influence on river/stream discharge
• Watershed modeling is a useful tool for understanding effects of land cover change, among other factors, and hence for supporting decision-making in a coastal environment.
Maraming salamat po!Maraming salamat po!