Explicit simulations of stream networks to guide hydrological modelling in ungauged basins
Explicit simulations of stream networks to guide hydrological modelling in ungauged basins
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DOI：
10.5194/hess-14-1435-2010
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发表时间：
2010-08
影响因子：
6.3
通讯作者：
S. Stoll;M. Weiler
中科院分区：
文献类型：
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作者：
S. Stoll;M. Weiler
抽象。无资料流域的降雨径流模拟仍然是水文研究中最大的挑战之一。由于缺乏流量数据，需要建立新的创新方法来指导无资料流域的水文建模。除了从类似的测量集水区的校准参数的传输，分布式数据作为水文响应，除了流量的应用程序似乎是有前途的。在德国的四个不同的集水区，一种新的方法来指导水文模型的基础上明确模拟的空间流网络进行了测试。在第一步中，我们使用简化版本的基于过程的模型Hill-Vi与区域气候正常值一起模拟河流网络。重力驱动的横向地下和地下水流的计算是用来识别流细胞的模式，这是比较参考流网络和空间协议的程度进行了评估。可以区分好的和坏的模拟之间的显着差异，相应的参数集与集水区的水文地质特性。优化后的参数，随后被用来模拟每天的排放量，使用观测到的时间序列的降水量和空气温度。根据观察到的排放和水平衡评价性能。这种方法显示出一些有希望的结果，但也有一些局限性。虽然该模型的简约模型结构，可以进一步改善排放衰退和蒸散，性能是类似的区域化方法。河流网络模型，它具有最低的数据要求，似乎是一个合理的替代模型开发和参数评估在无资料的流域。
Abstract. Rainfall-runoff modelling in ungauged basins is still one of the greatest challenges in hydrological research. The lack of discharge data necessitates the establishment of new innovative approaches to guide hydrological modelling in ungauged basins. Besides the transfer of calibrated parameters from similar gauged catchments, the application of distributed data as a hydrological response in addition to discharge seems to be promising. A new approach to guide hydrological modelling based on explicit simulation of the spatial stream network was tested in four different catchments in Germany. In a first step we used a simplified version of the process-based model Hill-Vi together with regional climate normals to simulate stream networks. The calculation of gravity driven lateral subsurface and groundwater flow is used to identify patterns of stream cells, which were compared to reference stream networks and their degree of spatial agreement was evaluated. Significant differences between good and poor simulations could be distinguished and the corresponding parameter sets relate well with the hydrogeological properties of the catchments. The optimized parameters were subsequently used to simulate daily discharge using an observed time series of precipitation and air temperature. The performance was evaluated against observed discharge and water balance. This approach shows some promising results but also some limitations. Although the model's parsimonious model structure could be further improved regarding discharge recession and evapotranspiration, the performance was similar to regionalisation methods. Stream network modelling, which has minimal data requirements, seems to be a reasonable alternative for model development and parameter evaluation in ungauged basins.