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- Title
Two-component hydrograph separation in a Tropical Forested Watershed, Puchong, Selandor, Malaysia.
- Authors
Saito, Mariko; Tsujimura, Maki; Nurhidayu, Siti; Fatimah, Siti; Hakim, Faizal
- Abstract
The hydrograph separation using isotope tracers is effective to identify the storm watersources. However, there are not enough investigations to specify the rainfall-runoff processesbased on the hydrograph separation in peninsular Malaysia. We aim to clarify the contributions of the groundwater to the storm runoff andrainfall-runoff process by using stable isotopes (deuterium and oxygen-18) and geochemicaltracers in a tropical rainforest catchment with an area of 4.69 km2 in Puchong, Selangor,Malaysia. We performed an intensive water sampling campaign for the storm of July (low streamflow season) and November (high stream flow season) in 2018. The storm runoffranged from 0.15 m3/s to 0.21 m3/s in the low-flow season, whereas that rangedfrom 0.5 m3/s to 1.1 m3/s in the high-flow season. The NO3− concentration ofthe stream in the high-flow season was higher than that in the low-flow season,suggesting that shallow subsurface water contributed to the runoff dominantly in thehigh-flow season. The SiO2 concentration and δ18O of the stream decreased atthe runoff peak and recovered during the recession limb of the runoff, showingthat the stream water was affected by the event water during the rainstorm. Weapplied an End Member Mixing Analysis using SiO2 as a tracer to separate the stormhydrograph into the event water and pre-event water components. The pre-eventwater component contributed to the storm runoff dominantly ranging from 70% to98% in both the low-flow and the high-flow seasons. Our result shows that thegroundwater takes an important role in the storm runoff during the rainfall events in thetropical rain forest with a consideration of previous data taken at the tropical regions.
- Subjects
MALAYSIA; SELANGOR; RUNOFF; RAIN forests; STREAMFLOW; ISOTOPE separation; WATERSHEDS; WATER depth
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article