Combined Hydrological Modelling and Regional Geodetic Estimation of Water Storage Variations in Large River Basins Using GRACE Data

利用 GRACE 数据对大河流域水储量变化进行水文模拟和区域大地测量相结合

• 批准号: 111553891
• 负责人: Professorin Dr. Petra Döll
• 金额: --
• 依托单位: Institut für Physische Geographie (IPG)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/111553891?language=en
• 关键词: Combined; Hydrological; Modelling; Regional; Geodetic

The goal of this collaborative project between hydrology, geodesy and mathematics, which continues the work of the current funding period is, on the one hand, to improve global-scale hydrological modelling of water storage variations and flows in the different storage compartments by using GRACE data. On the other hand, the determination of the static and temporal gravitational field in these regions from GRACE range and range-rate observations shall be improved by using information derived from hydrological models such as WaterGAP Global Hydrological Model WGHM. The role of the Frankfurt group will be the improvement of the hydrological model WGHM, the Bonn group will be responsible for the improvement of the GRACE analysis and the Potsdam group will develop and improve new estimation approaches that will help to advance project. This project aims at answering important hydrological questions, focusing 1) on the contribution of dynamic floodplain inundation to water storage and flow (continuing the work in the current funding period), and 2) on the impact of continental glaciers at seasonal and longer time scales. Central to the project is the development of a multi-objective calibration tool for WGHM using Ensemble Kalman filter techniques which will be used to exploit GRACE observations of total water storage variations (and river discharge observations) optimally for improved global-scale modeling of water storages and flows. The geodetic objectives comprise the further understanding and improvement of the GRACE level-1B analysis using the Kalman smoother approach resulting in the determination of improved daily GRACE solutions. These daily models will also be applied as de-aliasing product leading to an increase in accuracy of monthly solutions.

水文学、大地测量学和数学之间的这一合作项目是当前供资期工作的继续，其目标一方面是利用GRACE数据改进全球尺度水储存变化和不同储存区水流的水文模型。另一方面，通过GRACE距离和距离变化率观测确定这些区域的静态和时间重力场时，应利用从水文模型（如WaterGAP全球水文模型WGHM）获得的信息加以改进。法兰克福小组的作用是改进水文模型WGHM，波恩小组负责改进GRACE分析，波茨坦小组将开发和改进有助于推进项目的新估算方法。该项目旨在回答重要的水文问题，重点是1）动态洪泛区淹没对水储存和流动的贡献（继续当前供资期的工作），以及2）大陆冰川在季节和更长时间尺度上的影响。该项目的核心是开发一个多目标的校准工具WGHM使用Ensemble卡尔曼滤波器技术，将用于利用GRACE观测的总蓄水量变化（和河流流量观测）最佳改善全球规模的水储存和流量建模。大地测量目标包括利用卡尔曼平滑法进一步了解和改进GRACE 1B级分析，从而确定改进的GRACE每日解。这些每日模型也将作为去混叠产品应用，从而提高每月解决方案的准确性。