SGER: Cosmogenic 10-Be inventory of landslide debris in the steep Rio Chagres basin, Panama

该项目的目标是直截了当的，以确定是否滑坡影响宇宙成因放射性核素（CRN）库存的颗粒大小在一个陡峭的热带盆地。通过描述滑坡碎片的核素输入，研究将确定滑坡源的重要性，并建立一个全流域侵蚀率的质量和核素模型。 具体而言，将评估从1）滑坡碎屑、2）滑坡疤痕的综合深度剖面和3）上游河道沉积物中收集的五种粒度的核素清单。还将收集通道基岩样品，以测试当地来源的大颗粒核素输入。这些数据将使人们更好地了解造成里约查格雷斯河沉积物的过程，并将有助于建立一个质量和核素平衡模型，以更好地描述类似环境下全流域侵蚀率的特征。这些知识可以帮助规划，农业应用和洪水频率的分析。几年来，根据沉积物中所含放射性核素的分布来估计侵蚀率是可能的。然而，这些物质的浓度可能取决于沉积物的来源和颗粒大小，导致错误的估计。该项目将评估受滑坡过程影响的地区的侵蚀率是否受到沉积物中物质大小的影响。这将使今后计算侵蚀率的精度更高。

The project goal is straight forward, to determine if landslides influence the cosmogenic radionuclide (CRN) inventory of grain-sizes in a steep tropical basin. By characterizing the nuclide input of landslide debris the research will determine the importance of landslide sources and develop a mass and nuclide model for basin-wide erosion rates. Specifically, the nuclide inventory of five grain-sizes collected from 1) the landslide debris, 2) integrated depth profiles from the landslide scar and 3) upstream channel sediment will be evaluated. Channel bedrock samples will also be collected to test the nuclide input of local sources for large grains. These data will result in a greater understanding of the processes that contribute sediment to the Rio Chagres and will assist in developing a mass and nuclide balance model to better characterize the basin-wide erosion rates in similar settings.Erosion rates are a major issue for many places. Knowledge of these can help in planning, agricultural applications, and the analysis of flood frequencies. It has been possible for several years to estimate erosion rates from the ditribution of radionuclides that are contained in sediments. However, the concentration of these may depend on source of sediment and the grain sizes, leading to erroneous estimates. This project will evaluate whether the erosion rates in an areas affected by landsliding processes are affected by the size of the material in the sediments. This will lead to better precision in calculating erosion rates in the future.