Kyogle - Flood Mapping Study - Technical Addendum

During the course of the Flood Mapping Study, results predicted by the model appeared at times to be inconsistent with expected behaviour: In particular, the HEC-2 model appeared to incorrectly estimate the equivalent Manning's 'n' value or equivalent conveyance of a main channel section consisting of composite zones of hydraulic roughness. This led to a review of various methods for estimating equivalent 'n' values which is reported in this Technical Addendum在本次洪水制图研究开展期间，模型输出的预测结果有时会与预期的合理表现不符：具体而言，HEC-2模型对由多种水力糙率分区构成的主河道断面的等效曼宁糙率系数（Manning's n）或等效输水能力的估算存在偏差。这促使研究人员对各类等效糙率系数的估算方法开展了系统性梳理，相关内容已收录于本技术附录（Technical Addendum）中。