ABSTRACT

This study describes the impacts of refinement of hydraulic geometry (HG) relationships in the hydrological MGB model applied to an Amazonian sub-basin (Purus River basin). To this end, HG relationships were developed for the entire basin and for hydrologically homogeneous regions, and their performances were compared with observed data and a global width and depth database. Two simulations were then performed using the MGB model: one using the refined HG relationships and the other using the global width and depth database. The simulated streamflow and water level estimates were compared with observed data. The results showed that HG relationships for the hydrologically homogeneous regions provided better estimates of hydraulic parameters for the basin, with Nash-Sutcliffe efficiency of 0.96 for width and 0.95 for depth, and its use provided an improvement in the performance of the hydrological modelling in some gauge stations, with an increase in the Nash-Sutcliffe efficiency between 18% and 65%.

摘要

本研究描述了在应用于亚马逊子流域（普鲁斯河流域）的水文 MGB 模型中改进水力几何 (HG) 关系的影响。为此，开发了整个流域和水文均质区域的 HG 关系，并将其性能与观测数据和全球宽度和深度数据库进行了比较。然后使用 MGB 模型进行了两次模拟：一次使用改进的 HG 关系，另一次使用全局宽度和深度数据库。模拟的流量和水位估计值与观测数据进行了比较。结果表明，水文均质区域的 HG 关系为盆地的水力参数提供了更好的估计，宽度的 Nash-Sutcliffe 效率为 0.96，深度为 0.95，