Mike11 ---04---模拟堰流基本设置

发布于新浪博客，时间：2009-02-03 21:07:04 原文 (opens new window)

溢流堰模拟

Level-width表，这里level指的是堰顶高程，遵从以下规则：对每一水位值，堰处过水断面面积必须小于堰前后断面相应水位过水面积（可以通过查看断面processed data检查）。

Since a weir in MIKE 11 is defined as a structure causing a contraction loss and subsequently an expansion loss, some constraints are placed on the geometry of a broad crested weir. The geometry of the weir must be such that the cross sectional area at the weir is less than the cross sectional area at both the upstream and the downstream cross section for all water levels!

设置堰时确保是在模拟编辑器中打开河网编辑器，并确保在堰的前后有断面并断面之距落入内插最大间距值之内；

The cross sections must be within the distance maximum dx (Maximum dx (p. 42)) defined for the branch in question.

如果level表有改动，需要重新计算Q-h关系曲线；

The standard formulations for flow over a broad crested weir are established automatically by the program on the basis of the weir geometry and  the user specified head loss and calibration  coefficients. These formulations assume a hydrostatic pressure distribution on the weir crests. Different algorithms are used for drowned flow and free overflow, with an automatic switching between the two.

It is obtained by replacing the momentum equation with an h-Q-h relationship, an h-Q relationship, or a Q assignment.

Erro 1: No cross section in range specified by maximum dx

对策：检查堰前后附近是否设有断面，并确保断面间距落在内插间距（内插间距指在Branch里设置的Maximum dx）范围内。

Erro 2: Unable to calculate Q/h relations at ***. Please check the weir geometry and the geometry of the upstream cross secrtion at *** and the downstream cross section at *** . Return code =1.

对策：检查level-width表的level值