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Runoff response and sediment yield of a landslide-affected fire-climax grassland micro-catchment (Leyte, The Philippines) before and after passage of typhoon Haiyan2.27 MB
Accepted VersionCC BY-NC-ND V4.0, Open Access
Journal article
Runoff response and sediment yield of a landslide-affected fire-climax grassland micro-catchment (Leyte, The Philippines) before and after passage of typhoon Haiyan
Journal of Hydrology, Vol.565, pp.524-537
2018
Abstract
Decades of logging and slash-and-burn agriculture have turned vast tracts of land in tropical South-east Asia into unproductive fire-climax grasslands whose hydrological functioning is poorly known. To help fill this knowledge gap, a 3.2 ha landslide-affected Imperata grassland micro-catchment with perennial flow on Leyte Island (Philippines) was instrumented and monitored for a year. The area was hit by typhoon Haiyan on 8 November 2013, one of the largest events on record. Landslide surfaces covered 3.4% of the catchment prior to typhoon Haiyan and contributed to 'direct runoff' (Qq). This basic 'contributing area' increased to 7.7% by activation of old landslides and formation of new ones during typhoon Haiyan. Median storm runoff coefficients (Qq/P) based on straight-line hydrograph separation were 9% and 23% before (48 events) and after the typhoon (43 events), respectively, but the ratios of period-total Qq and P were much larger (24% and 47%, respectively). Both storm runoff volumes and peak discharge increased rapidly once a mid-slope water storage threshold for the upper 60 cm of soil of 250 mm was exceeded. Storm runoff contributions above those generated on landslides were most likely in the form of overland flow given the prevailing very low soil hydraulic conductivities. Post-typhoon water use of the heavily disturbed vegetation was reduced initially by nearly 70%, recovering to nearly 80% of the pre-typhoon value after ∼3 months. The high annual sediment yield (∼27 t ha-1) was heavily dominated by post-Haiyan sediment transport (94%); bedload contributed ∼8% of the total sediment yield.
Details
- Title
- Runoff response and sediment yield of a landslide-affected fire-climax grassland micro-catchment (Leyte, The Philippines) before and after passage of typhoon Haiyan
- Authors
- Jun Zhang (Author) - VN University, NetherlandsH J (Ilja) van Meerveld (Author) - University of Zurich, SwitzerlandRoger Tripoli (Author) - Visayas State University, PhilippinesL Adrian Bruijnzeel (Author) - University of the Sunshine Coast - Faculty of Arts, Business and Law
- Publication details
- Journal of Hydrology, Vol.565, pp.524-537
- Publisher
- Elsevier BV
- Date published
- 2018
- DOI
- 10.1016/j.jhydrol.2018.08.016
- ISSN
- 0022-1694
- Copyright note
- Copyright © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
- Organisation Unit
- University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99450898402621
- Output Type
- Journal article
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