制定实时冠测量

There are times during major weather events when we may hear the news reporter indicate the local river is expected to crest in the next 12 hours at an estimated stage level.

What is a crest and a stage level, and how do they affect me?

基本上，嵴是预期的或测量的高水位，然后在水开始在特定事件的特定位置进行后退。该事件可能是一个大暴雨，飓风或春天的雪熔体，导致当地流，河流或其他物体的高水位。通常，该位置是基于高水位具有最大导致损坏或威胁生活的位置的位置。

Stage is a term for water level based on a fixed local reference point or datum and at a fixed position on the body of water. The reference point is surveyed to obtain a precise elevation and normally correlated to the mean sea level.

基于多年的监测和分析每个测量网站的数据，可以与预测在河流中流动的水有关的合理预测，阶段水平是安全的，并且在潜水级洪水发生。监测这些网站已在几十年内持续到几个案例，超过100年。

如今 - 使用现场级，自动数据采集系统 - 通常每15分钟进行阶段测量。这个15分钟的舞台数据非常了解正在监测水体的动态。然而，在一个事件期间，实际的波峰经常发生在两个15分钟的收集点之间，并且由于不足够快而错过了实际嵴的测量。

To capture the crest, often a manual gauge is used in addition to the automated system. This is a solid tube mounted securely to a bridge pier or other solid structure. Holes in the bottom of the tube with vent holes at the top allow water to come into the tube at the same level as the main body of water. A graduated staff rod is secured inside the tube and rests on a datum pin, which helps to ensure the staff rod is always at the same elevation. A cork material is carefully placed in the tube, and the cork material floats on the top of the water. The cork sticks to the staff rod at the surface of the water, and as the water recedes, the cork indicates the crest measurement. This method identifies the crest level, but it does not give the time or date the crest was detected, and it only catches the highest event between site visits.

A:Graduated staff (fits inside the pipe)
B:Pipe cap
C:括号
D:Secure mounting structure
E:Holes to admit water

随着技术的发展和发展，曾经只能手动使用的测量可以自动化。坎贝尔科学的LevelVUE™B10是一个水位传感器，现在可以自动测量CREST舞台读数。

The LevelVUE™B10 water-level sensor is based on an indirect pressure measurement to determine water levels. This technology is often referred to as a bubbler. Bubbler-type water-level sensors are widely used, as they provide stable data and do not need a stilling well for the installation. Typically, bubblers are used to measure the water levels at the 15-minute rate, but the LevelVUE™B10 has the ability to also measure and report the crest stage reading detected between the 15-minute primary measurements.

在下面的图像中，在每个结束时突出显示15分钟的数据，该点显示15分钟的痕迹之间的实际水位。在这种情况下，检测到1.79米（5.87英尺）的峰值，可以保存以供以后处理或用于立即动作，例如信令报警条件。注意：仅保存了主测量之间的检测到的峰值。

单击图形以获取更大的图像。

Often, the crest gauge is located a few feet to several feet upstream or downstream from the automated gauge. Based on the slope of the river, this distance can cause a difference in the reading of the two gauges that must be noted. With the LevelVUE™B10, measuring both the main stage data value and the crest at the exact same location eliminates that difference.

Although the LevelVUE™B10 is not intended to eliminate the crest-stage gauge, it does provide valuable information on what the actual crest was and when it occurred. This data can be used in real time to generate alarms, send random transmissions on the GOES system, or simply just be logged for future reference.

有关此产品的更多信息，请访问LevelVUE™B10 web page.