Modelling of surface runoff and soil erosion in La Trinidad sub-watershed

Date

6-2025

Abstract

The computer-based physical dynamic model uses the PCRaster script, integrating soil physics equations, Manning's, Rose and Freebairn's, and the Chezy Coefficient, to simulate surface runoff and predict soil loss. The model also integrates user-friendly technology, such as GIS, Remote Sensing, and data loggers. Rainfall Event 1 generated 71,126.22 m³ estimated total surface runoff carrying 580,741.92 kg, equivalent to a 1.92 T/ha soil erosion rate. The estimated eroded sediment for Rainfall Event 2 was 3 1 1,057.28 kg in 38,096.24 m³ surface runoff, or a soil erosion rate of 1.03 T/ha. For Events 3 and 4, the eroded sediment was 101,361.89 kg and 108,918.72 kg in 12,429.22 m³ and 13,337.93 m³ surface runoff, respectively. The soil erosion rate for Event 3 was 0.34 T/ha, while 0.36 T/ha in Event 4. All soil erosion rates predicted were below the soil loss threshold limit at 10 T/ha/yr. Only Rainfall Event 1 was classified as erosive. The model's overall performance was satisfactory, indicative of the low RMSE, high R?, and NSE values, and a p-value greater than 5% for the Welch t-test. Generated surface runoff and soil loss were associated with the land use and land cover type within the La Trinidad Sub-Watershed.

Document Type

Dissertation

Degree

Doctor of Philosophy in Soil Science

College

Graduate School (GS)

Adviser/Committee Chair

Dr. Victorino A. Bato

Committee Member

Dr. Sherry B. Marasigan, Dr. Maria Victoria O. Espaldon, Dr. Gina V. Pangga

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

En – AGROVOC descriptors

TILLAGE EROSION; SOIL LOSS; ERODED SOILS; REVISED UNIVERSAL SOIL LOSS EQUATION; GEOGRAPHICAL INFORMATION SYSTEMS; REMOTE SENSING; LAND SURVEYING; MICROCATCHMENTS

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