Analysis and Modelling of catchment-scale proglacial geomorphodynamics based on multitemporal airborne and terrestrial LiDAR surveys

PROSA项目的第5套工作（阿尔卑斯山快速变化的前冰系统地貌动力学高分辨率测量）与其余的分项目合作，通过对沉积物级联沿着各种地貌过程的沉积物输运进行区域化局部测量，确定上考纳塔尔研究区的沉积物收支。自上一个项目阶段以来，拟议后续期的这一工作包的主要目标没有改变：（激光扫描，ALS）测量;先前开发的提高数据准确性和可靠性的方法（例如测量误差的空间分布）将进一步细化（2）综合所有工作包的结果，以确定研究区的沉积物预算。为了实现这一目标，必须使用各种方法，如模拟模型、统计方法以及地貌和岩土工程图分析，将在试验区（当地和山坡规模）进行的测量结果扩大到整个流域（区域化）。对绘制的沉积路径和模拟的沉积路径进行分析，有助于深入了解在研究区形成沉积瀑布的各种地貌过程的相互作用，并更好地了解系统（例如沉积连通性）。沉积物收支及其各部分将用于（一）评估冰川和非冰川过程的相对贡献，（二）比较分析冰川消退以来不同时期地区的过程速率，以及（三）判断流域内沉积物转移和沉积物输出的比例;后者的数量也指Kaunertal水库的沉积物输入。(3)此外，该工作包继续负责协调所有工作包的任务，最重要的是组织和管理数据收集和交换，以及提供数字高程模型（精细地理配准、纠错、过滤），包括错误评估。建议进行9个月随访的决定是由于第三方未能提供数据（ALS调查飞行），这是追求主要项目目标必不可少的。项目期的延长可以填补这些数据空白;具体而言，新的数据将使夏季和冬季的形态动力学的定量比较流域规模。此外，Gepatsch水库将在2016年春季的拟议后续期内完全排空：对干涸湖底的TLS调查，加上已经生成的水库前（1953/54）数字高程模型，将有助于对沉积物体积进行准确量化（和年平均产沙量），这将形成一个理想的平衡的泥沙预算所建立的项目。

Work package 5 of the PROSA project (High-resolution measurements of geomorpho-dynamics in rapidly changing proglacial systems of the Alps) cooperates with the remaining subprojects in establishing the sediment budget of the Upper Kaunertal study area by regionalising localised measurements of sediment transport by various geomorphic processes along sediment cascades. The main aims of this work package for the proposed follow-up period have not changed since the previous project phase: (1) Continuation of airborne (laserscanning, ALS) measurements; the previously developed method for the enhancement of data accuracy and reliability (e.g. the spatial distribution of measurement errors) will be further refined (2) Integration of the results of all work packages to establish the sediment budget of the study area. In order to reach this aim, the results of measurements conducted on test areas (on the local and hillslope scale) have to be upscaled to the whole catchment (regionalisation), using various methods such as simulation models, statistical approaches, and the analysis of the geomorphological and geotechnical map. The analysis of mapped and modelled sediment pathways leads to important insights into the interaction of various geomorphic processes that form sediment cascades in the study area, and a better understanding of the system (e.g. sediment connectivity). The sediment budget and its parts will be used (i) to assess the relative contribution of glacial and non-glacial processes, (ii) for a comparative analysis of process rates in areas with different periods of time since deglaciation, and (iii) to judge the ratio of sediment transfer within and sediment export from the catchment; the latter quantity refers also to the sediment input to the Kaunertal reservoir.(3) Additionally, this work package continues to be in charge of coordination tasks for all work packages, most importantly the organisation and management of data collection and exchange, and the provisioning of digital elevation models (fine georeferencing, error correction, filtering), including the error assessment.The decision to propose a 9-month follow-up has been brought about by third-party failure to produce data (ALS survey flights) that are essential for pursuing major project goals. The extension of the project period allows to fill these data gaps; specifically, the new data will enable the quantitative comparison of summer- and winter-term morphodynamics on the catchment scale. Moreover, the Gepatsch reservoir will be completely emptied during the proposed follow-up period in spring 2016: A TLS survey of the dry lake bottom, together with the already generated pre-reservoir (1953/54) digital elevation model, will facilitate the exact quantification of the sediment volume (and mean annual sediment yield) deposited in the reservoir, which will form an ideal counterbalance of the sediment budget established by the project.