${session.getAttribute("locale")} 5 Characteristics of landslides caused by the 2018 Hokkaido Eastern Iburi Earthquake Tue 30 Jul 2019 09:52:43 AEST ]]> Analysis of overland flow generation and catchment storm runoff using a distributed runoff model in a headwater catchment draining Japanese cypress forest Fri 14 Jun 2019 13:45:55 AEST ]]> Unprecedented rates of landslide and surface erosion along a newly constructed road in Yunnan, China Fri 14 Jun 2019 13:45:24 AEST ]]> Placing sediment budgets in the socio-economic context for management of sedimentation in Lake Inle, Myanmar Fri 08 Feb 2019 10:24:25 AEST ]]> Caesium-137 in Southeast Asia: Is there enough left for soil erosion and sediment redistribution studies? Fri 08 Feb 2019 10:24:22 AEST ]]> Sediment source tracing with stratified sampling and weightings based on spatial gradients in soil erosion ex) are smaller at locations with higher soil erosion rate and that if this is not accounted for, then spatially random sampling gives a biased representation of surface soil delivered to rivers and biased source contribution estimates. Materials and methods: Surface soil was sampled across the Burdekin River basin in northeast Australia at 90 locations stratified by three classes of modelled soil erosion rate and analysed by gamma spectroscopy. Separate probability distributions (density functions) were fitted to the 137Cs concentrations of samples of each erosion class, of subsurface soil and of river sediment. Surface soil distributions were aggregated by weighting in proportion to the upstream area and mean erosion rate of each erosion class, so that the high erosion class contributed disproportionately to the tracer properties of the surface soil source. Source contributions were estimated using a Monte Carlo mixing model. Results and discussion: The mean surface soil concentrations of 137Cs and 210Pbex were significantly different between soil erosion classes as hypothesised. Weighting surface soil from the high erosion class more heavily increased the estimated proportion of river sediment contributed from surface soil, by 35 % larger than if surface soil sampling was confined to low erosion areas. Stratified sampling and weighting by erosion rate is of greater importance in river basins with large gradients in soil erosion and where surface soil contributes substantially to river sediment. Surface soil contributed 6 % to fine sediment at the basin outlet and 0–14 % in major tributaries, which was somewhat lower than in a prior study probably due to recent above-average rainfall increasing vegetation ground cover. Conclusions: Surface soil sampling for source tracing using fallout radionuclides should be stratified by erosion rate. The tracer properties of high erosion areas should be weighted more heavily than low erosion areas in source mixing models. If comprehensive sampling cannot be afforded, then sampling should be biased towards more highly eroding areas. The approach should be considered for other source tracers whose properties may co-vary with soil erosion rate. Fine sediment delivered from the Burdekin River basin to the Great Barrier Reef lagoon in recent decades was predominantly derived from gully erosion, streambank erosion and rilled and scalded areas on hillslopes. © 2015, Crown Copyright as represented by: CSIRO.]]> Fri 08 Feb 2019 10:24:16 AEST ]]> Paired geochemical tracing and load monitoring analysis for identifying sediment sources in a large catchment draining into the Great Barrier Reef Lagoon Fri 08 Feb 2019 10:24:09 AEST ]]> Disastrous sediment discharge due to typhoon-induced heavy rainfall over fossil periglacial catchments in western Tokachi, Hokkaido, northern Japan Fri 08 Feb 2019 10:24:06 AEST ]]> Discharge and suspended sediment transport in the Ayeyarwady River, Myanmar: Centennial and decadal changes Fri 08 Feb 2019 10:24:03 AEST ]]> 10Be-derived denudation rates from the Burdekin catchment: The largest contributor of sediment to the Great Barrier Reef 100,000km2). In Australia, however, the approach and its assumptions have not been systematically tested within a single, large drainage basin. This study measures 10Be concentrations in river sediments from the Burdekin catchment, one of Australia's largest coastal catchments, to determine long-term (>10,000years), time-integrated rates of sediment generation and denudation. A nested-sampling design was used to test for effects of increasing catchment scale on nuclide concentrations with upstream catchment areas ranging from 4 to 130,000km2. Beryllium-10 concentrations in sediment samples collected from the upstream headwater tributaries and mid-stream locations range from 1.8 to 2.89×105atomsg-1 and data confirm that nuclide concentrations are well and rapidly mixed downstream. Sediment from the same tributaries consistently yielded 10Be concentrations in the range of their upstream samples. Overall, no decrease in 10Be concentrations can be observed at the range of catchment scales measured here. The mean denudation rate for all river sediment samples throughout the Fanning subcatchment (1100km2) is 18.47mMa-1, which compares with the estimate at the end of the Burdekin catchment (130,000km2) of 16.22mMa-1. Nuclide concentrations in the lower gradient western and southern catchments show a higher degree of variability, and several complications emerged as a result of the contrasting geomorphic processes and settings. This study confirms the ability of TCNs to determine long-term denudation rates in Australia and highlights some important considerations in the model assumptions that may affect the accuracy of limited sampling in large, low-gradient catchments with long storage times. © 2015 Published by Elsevier B.V.]]> Fri 08 Feb 2019 10:24:00 AEST ]]> Linkages among land use, macronutrient levels, and soil erosion in northern Vietnam: A plot-scale study Fri 08 Feb 2019 10:23:57 AEST ]]>