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

PROSA项目的第5个工作包（阿尔卑斯山脉快速变化的前冰期系统中地貌动力学的高分辨率测量）与其他子项目合作，通过对沿沉积物级联的各种地貌过程的沉积物运输的局部测量进行区划，建立上考纳塔尔研究区的沉积物预算。自上一个项目阶段以来，该工作包在拟议后续期间的主要目标没有改变：(1)继续进行机载（激光扫描，ALS）测量；(2)整合各工作包的结果，建立研究区沉积物预算。为了达到这一目标，必须使用各种方法，如模拟模型、统计方法、地貌图和岩土图分析，将在试验区（局部和山坡尺度）进行的测量结果扩大到整个流域（分区）。对绘制和模拟的沉积物路径的分析，有助于深入了解形成研究区域沉积物级联的各种地貌过程的相互作用，并更好地了解该系统（例如沉积物连通性）。泥沙预算及其各部分将用于(i)评估冰川和非冰川过程的相对贡献，（ii）对冰川消退后不同时期地区的过程速率进行比较分析，以及（iii）判断流域内泥沙转移和流域外输泥沙的比例；后者也指考纳塔尔水库的泥沙输入量。(3)此外，该工作包继续负责所有工作包的协调任务，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（精细地理参考，误差校正，滤波），包括误差评估。由于第三方未能提供对实现主要项目目标至关重要的数据（ALS调查飞行），因此决定提出9个月的后续行动。项目期限的延长可以填补这些数据空白；具体地说，新的数据将能够在集水区尺度上对夏季和冬季的形态动力学进行定量比较。此外，Gepatsch水库将在2016年春季的后续计划期间完全清空：对干湖底的TLS调查，以及已经生成的水库前（1953/54）数字高差模型，将有助于准确量化水库中沉积的泥沙体积（和平均年产沙量），这将形成该项目建立的泥沙预算的理想平衡。

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.