著者
Mariko Saito Maki Tsujimura Siti Nurhidayu Abu Bakar
出版者
Japan Society of Hydrology and Water Resources (JSHWR) / Japanese Association of Groundwater Hydrology (JAGH) / Japanese Association of Hydrological Sciences (JAHS) / Japanese Society of Physical Hydrology (JSPH)
雑誌
Hydrological Research Letters (ISSN:18823416)
巻号頁・発行日
vol.17, no.2, pp.28-35, 2023 (Released:2023-05-10)
参考文献数
44
被引用文献数
1

This study aims to clarify the contributions of pre-event water to storm runoff using environmental tracers (dissolved inorganic ions and stable isotopes) in a tropical forested catchment in Puchong, Selangor, Malaysia. We performed intensive sampling campaigns of stream water and throughfall for two storm events in July and November 2018. The discharge showed a low peak of 0.13 mm/h in event 1, with 18 mm of total rainfall, whereas event 2, with 50 mm of total rainfall, showed a quick discharge peak of 1.17 mm/h and a slow recovery of 0.39 mm/h. The nitrate concentration in the stream water during event 2 was higher than that in event 1. The temporal variations in nitrate ions indicate that subsurface water provided a dominant stormflow in event 2. Hydrograph separations using silicate as a tracer revealed that pre-event water was the dominant component of the storm hydrograph (58–98%). Our results suggest that pre-event water plays an essential role in storm runoff of headwaters in humid tropical regions.