• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of hydro-environment research >Distributed parameter unsteady flow model for the Han River
【24h】

Distributed parameter unsteady flow model for the Han River

机译：汉江分布式参数非恒定流模型。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An unsteady flow model that allows a variable roughness coefficient for each computational point according to its spatial position (x) and the value of discharge (Q) was developed. A step function and a power function were considered for functional relationships between discharge and Manning's roughness coefficient (n). The model was applied to the main reach of the Han River and model parameters were estimated by optimization. From the model calibration, spatial variation and discharge dependence of Manning's n were identified by testing different n(x, Q) functions. First, the value of the roughness coefficient is higher for the upstream reach of the Wangsook Stream junction than it is for the downstream reach. Second, estimated parameters of both the step function model and the power function model show that Manning's n decreases as discharge increases. This tendency is more noticeable for the upstream reach of the Wangsook Stream junction compared to the downstream reach. Further, the stages calculated by the variable roughness coefficient model are more consistent with the observed ones than those from the conventional constant parameter model. Regarding the variation of Manning's n relative to discharge, adopting a power function as the Manning's n-discharge relationship seems to be more appropriate than adopting a step function because it is easy to apply and the performance is as good as that of the step function model.
机译：建立了一个非稳态流动模型，该模型允许根据每个计算点的空间位置（x）和排放值（Q）来改变其粗糙度系数。考虑了阶跃函数和幂函数来确定放电与曼宁粗糙度系数（n）之间的函数关系。将该模型应用于汉江主河段，并通过优化估算模型参数。通过模型校准，通过测试不同的n（x，Q）函数来确定曼宁n的空间变化和放电依赖性。首先，Wangsook流域交界处上游的粗糙度系数值比下游的粗糙度系数值高。其次，阶跃函数模型和幂函数模型的估计参数都表明曼宁的n随着放电的增加而减小。与下游河段相比，这一趋势在望索溪交界处的上游河段更为明显。此外，由可变粗糙度系数模型计算出的阶段与从常规恒定参数模型得到的阶段更加一致。关于曼宁n相对于放电的变化，采用幂函数作为曼宁n放电关系似乎比采用阶跃函数更合适，因为它易于应用且性能与阶跃函数模型一样好。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号