Modelling hydrologic processes distribution in a tropical forest watershed in the Philippines

Cruz R. V. O., . and Combalicer E. A., . and Lee S. H., . and Im S., . Modelling hydrologic processes distribution in a tropical forest watershed in the Philippines. pp. 155-169. ISSN 0128-1283

Hydrologic modelling has become an indispensable tool and cost-effective process in understanding the movement of water loss in the Molawin rainforest watershed Philippines. The study aimed to optimise the use of a lumped BROOK90 model and simulate the hydrologic processes distribution in a given watershed. The rating curve model was developed as a basis for hydrologic modelling. The model was calibrated at catchment scale to avoid subjectivity of various variable parameters by considering the topography morphology climate soil and canopy characteristics. Five years of streamflow discharge measurements were considered for the model sensitivity analysis calibration and validation. Results showed a good agreement between observed and simulated streamflows during calibration (r 0.87 and E 0.87) and validation (r 0.84 and E 0.81) periods. As a consequence the major hydrologic processes distribution accounted for 41 of the precipitation that turned into evaporation while 49 became streamflow and 10 remained in deep seepage loss. Overall the distribution of hydrologic components is primarily reflected during pronounced seasonal variations and fluctuating patterns in precipitation.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v22n2/15...

Abstract

Hydrologic modelling has become an indispensable tool and cost-effective process in understanding the movement of water loss in the Molawin rainforest watershed Philippines. The study aimed to optimise the use of a lumped BROOK90 model and simulate the hydrologic processes distribution in a given watershed. The rating curve model was developed as a basis for hydrologic modelling. The model was calibrated at catchment scale to avoid subjectivity of various variable parameters by considering the topography morphology climate soil and canopy characteristics. Five years of streamflow discharge measurements were considered for the model sensitivity analysis calibration and validation. Results showed a good agreement between observed and simulated streamflows during calibration (r 0.87 and E 0.87) and validation (r 0.84 and E 0.81) periods. As a consequence the major hydrologic processes distribution accounted for 41 of the precipitation that turned into evaporation while 49 became streamflow and 10 remained in deep seepage loss. Overall the distribution of hydrologic components is primarily reflected during pronounced seasonal variations and fluctuating patterns in precipitation.

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Item Type:	Article
AGROVOC Term:	Geohydrology
AGROVOC Term:	Tropical forests
AGROVOC Term:	Plant morphology
AGROVOC Term:	Climate change
AGROVOC Term:	Soil analysis
AGROVOC Term:	Canopy
AGROVOC Term:	Seepage water
AGROVOC Term:	Precipitation
AGROVOC Term:	Water loss
AGROVOC Term:	Forest reserves
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/21497

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