Suspended sediment load in the tidal zone of an Indonesian river
| Autor: | Buschman, F. A., Hoitink, A. J. F., de Jong, S. M., Hoekstra, P., Hidayat, H., Sassi, M. G., Sub FG Kust Riv Gl 2e geldstroom, FG Kusten, Rivieren, Global Change, Landdegradatie en aardobservatie, Proceskunde, Landscape functioning, Geocomputation and Hydrology, Coastal dynamics, Fluvial systems and Global change |
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| Přispěvatelé: | Sub FG Kust Riv Gl 2e geldstroom, FG Kusten, Rivieren, Global Change, Landdegradatie en aardobservatie, Proceskunde, Landscape functioning, Geocomputation and Hydrology, Coastal dynamics, Fluvial systems and Global change |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Aardwetenschappen
Drainage basin runoff Rainforest Structural basin Hydrology and Quantitative Water Management lcsh:Technology lcsh:TD1-1066 soil r-factor Acoustic Doppler current profiler Marine ecosystem lcsh:Environmental technology. Sanitary engineering catchment impacts lcsh:Environmental sciences Hydrology lcsh:GE1-350 east kalimantan geography geography.geographical_feature_category WIMEK Discharge lcsh:T lcsh:Geography. Anthropology. Recreation Coral reef erosion flux coral-reefs lcsh:G Environmental science Surface runoff hbv model Hydrologie en Kwantitatief Waterbeheer |
| Zdroj: | Hydrology and Earth System Sciences, 16, 4191-4204 Hydrology and Earth System Sciences, Vol 16, Iss 11, Pp 4191-4204 (2012) Hydrology and Earth System Sciences, 16(11), 4191. European Geosciences Union Hydrology and Earth System Sciences 16 (2012) Hydrology and Earth System Sciences, 16, 4191. Copernicus Publications |
| ISSN: | 1027-5606 1607-7938 |
| Popis: | Forest clearing for reasons of timber production, open pit mining and the establishment of oil palm plantations generally results in excessively high sediment loads in tropical rivers. The increasing sediment loads pose a threat to coastal marine ecosystems, such as coral reefs. This study presents observations of suspended sediment loads in the Berau River (Kalimantan, Indonesia), which debouches into a coastal ocean that is a preeminent center of coral diversity. The Berau River is relatively small and drains a mountainous, still relatively pristine basin that receives abundant rainfall. In the tidal zone of the Berau River, flow velocity was measured over a large part of the river width using a horizontal acoustic Doppler current profiler (HADCP). Surrogate measurements of suspended sediment concentration were taken with an optical backscatter sensor (OBS). Averaged over the 6.5 weeks covered by the benchmark survey period, the suspended sediment load was estimated at 2 Mt yr−1. Based on rainfall-runoff modeling though, the river discharge peak during the survey was supposed to be moderate and the yearly averaged suspended sediment load is most likely somewhat higher than 2 Mt yr−1. The consequences of ongoing clearing of rainforest were explored using a plot-scale erosion model. When rainforest, which still covered 50–60% of the basin in 2007, is converted to production land, soil loss is expected to increase with a factor between 10 and 100. If this soil loss is transported seaward as suspended sediment, the increase in suspended sediment load in the Berau River would impose a severe stress on this global hotspot of coral reef diversity. |
| Databáze: | OpenAIRE |
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