Evaluation of the Gash Rainfall Interception Model in Forest Plantations

Yulia Amirul Fata, Hendrayanto, Yoga Adhi Pratama, Erizal, Suria Darma Tarigan

Abstract

Interception modeling, an important part of hydrological modeling, can be used to determine water balance, infiltration processes, the function of vegetation in reducing rainfall, and the hydrological function of vegetation. This study aims to simplify Gash’s model and evaluate its performance compared with the Gash model and revised Gash model in forest plantations of teak (Tectona grandis) and Maesopsis eminii. The performances of these three models of the Gash model (GM), revised Gash model (RGM), and simplified Gash model (SGM) were measured by comparing the models to the observed interception. The observed interception was calculated on the basis of daily gross rainfall, stemflow, and throughfall measurements. Canopy interception of the simplified Gash model gives the closest result to the measured canopy interception compared to the Gash model and revised Gash model. The average field-measured canopy interception of teak and young and old Maesopsis eminii forest plantations was 42%, 38%, and 39% of 1451-mm rainfall, respectively. The average canopy interception based on the GM, RGM, and SGM were 30%, 32%, 38%, and 42% (for teak plantation), 7%, 7%, 35%, and 38% (for young Maesopsis eminii plantation), and 14%, 15%, 35%, and 39% (for old Maesopsis eminii), respectively. The canopy interception differences between SGM and field-measured canopy interception in teak and young and old Maesopsis eminii plantations were 4% (59.7 mm), 3% (52.8 mm), and 3.7% (54.1 mm).

 

Keywords: interception, the Gash model, forest plantation, Tectona grandis, Maesopsis eminii.

 

https://doi.org/10.55463/issn.1674-2974.50.12.3


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