Influence of some microclimatic and hydrologic factors on streamflow and sediment yield of grassland watersheds in Angat

Date

10-1979

Abstract

The influence of rainfall (amount, duration and intensity), evapotranspiration, initial and peak flows on streamflow; and that of streamflow, initial flow, peak flow, evapotranspiration and rainfall (amount, duration and intensity) on sediment yield, were studied on per storm basis. Data came from a 5 year record of two Imperata-Saccharum grassland watersheds, namely, the Right Fork (1.84 has.) and the Left Work ( 0.99 ha.), located within the Angat Experimental Watershed of the Forest Research Institute. The multiple regression analysis was used.

The orientation of the Righ Fork was southeast while the Left was south. The slope angle of the Right Fork was 28% while that of the Left was 26%. The soil of the area was of the Novaliches clay loam type and acidic. The soil bulk density of the Right Fork was 1.3 g/cc and the Left Fork, 1.1 g/cc. The former had a constant infiltration rate of 1.6 iph and the latter, 2.6 iph. The site belonged to the first type of Corona's climatic classification.

At the Right Fork, 53% of the variation in the streamflow was due to combined effects of the initial flow, rainfall amount and evapotranspiration. The standard partial regression coefficients revealed that initial flow and evapotranspiration were more important that rainfall amount in estimating streamflow. For the Left Fork, similar variables were responsible for 48% of the variation in streamflow however initial flow was the most important estimator of streamflow followed by evapotranspiration then by the rainfall amount.

For the sediment yield, the independent variables accounted for 62% of its variation at the Right Fork and 64% at the Left Fork. Peak flow, initial flow and evapotranspiration were the most important variables in estimating sediment yield of the Right Fork. At the Left Fork the most important factor was streamflow followed by peak flow, amount of rainfall and initial flow, in that order.

Document Type

Dissertation

Degree

Doctor of Philosophy in Agronomy

Adviser/Committee Chair

Arturo C. Alferez

Committee Member

Arsenio D. Calub, Senen M. Miranda, Wilfredo P. David, Percy E. Sajise

Language

English

LC Subject

Microclimatic, Hydrologic

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 996 1979 A42 L87

Notes

Doctor of Philosophy ( Agronomy)

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