JPH04151523A - Method for measuring snow cover - Google Patents

Abstract

PURPOSE:To reduce the effects of a bridge and wind as small as possible and to make it possible to measure the snow cover accurately by using a plurality of snow pressure sensors having the different heights, and obtaining the highest pressure signal among the pressure signals which are outputted from the sensors. CONSTITUTION:In each snow pressure sensor 1, the weight of the snow on a diaphragm 3 is converted into the pressure of liquid 4 which is sealed in a sensor main body 2. The pressure is outputted from a pressure sensor 5 as a pressure signal. For example, three sensors 1 are so arranged that the heights are different, respectively (one is arranged on the ground). At the beginning period of the snowfall the sensor 1 provided on the ground usually shows the highest pressure. When the sensor 1 is covered with the snow by the increase of the amount of the snow cover, a bridge 8 is formed at the upper part of this sensor 1, and the snow-cover sensitivity is lost. At this time, the sensor 1 which is closest to the surface of the snow wherein the effects of the bridge and wind are less performs the most accurate operation. The pressure indicates the highest value. Therefore, the pressure signal indicating the highest value has the least effects of the bridge and the wind among three pressure signals. Thus, the accurate snow cover can be measured by this signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for measuring the amount of snow for flood control, meteorology, road management, and the like.

[Prior Art] It is already known to measure the amount of snow with a snow pressure sensor.

The above-mentioned snow pressure sensor measures the amount of snow by converting the weight of snow on the sensor into pressure, but when it becomes buried in snow due to an increase in the amount of snow, the apparent pressure sensor acts on the sensor due to the bridge inside the snow. Due to the reduced weight,
The amount of snowfall cannot be measured accurately. Furthermore, if the sensor is installed at a higher height to eliminate the influence of the bridge, the snow on the sensor will be blown away by the wind, making it similarly impossible to measure accurately.

[Problems to be Solved by the Invention] An object to be solved by the present invention is to provide a method for measuring snowfall amount in which the effects of bridges and wind inside the snowfall are as small as possible.

[Means for Solving the Problems] In order to solve the above problems, the snow amount measuring method of the present invention uses a plurality of snow pressure sensors each having a different installation height,
The snowfall amount is determined by the highest pressure signal among the pressure signals output by these snow pressure sensors.

[Function] Multiple snow pressure sensors installed at different heights output pressure corresponding to the weight of snow on each sensor, but since the amount of snow is determined by the signal that indicates the highest pressure among them, it is difficult to detect bridges or wind. The influence can be made as small as possible, thereby making it possible to accurately measure the amount of snowfall.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows a pressure billow type snow weighing scale which is an example of a snow pressure sensor used in the present invention. An antifreezing liquid 4 is sealed in the main body 2, and a pressure sensor 5 is attached to take out the pressure of the sealed liquid 4 as a snow signal, and converts the weight of snow on the diaphragm 2 into the pressure of the sealed liquid 4. , the pressure sensor 5 outputs this pressure as a pressure signal.

FIG. 1 shows a principle diagram of the snow amount measurement according to the present invention using three snow pressure sensors 1 described above as an example. One of the snow pressure sensors 1 is installed on the measurement ground, and the other sensors 1, 1
By using stands 7.7 or supports of different heights,
Each of them is installed horizontally and can crawl in height. In this case, if a stand with extensible columns is used, the installation height of each sensor I can be easily adjusted.

During the early snowfall season, all snow sensors l,... operate equally, but normally the sensor l closest to the ground has less wind influence, so it has the largest amount of snow and the highest pressure. shows.

When the snow pressure sensor 1 is buried in snow due to an increase in snowfall,
As shown in Figure 1, a bridge 8 is formed at the top of the sensor and the snow sensitivity is lost; however, in this case, the sensor 1 closest to the snow surface, where there is less influence from the bridge and wind, operates most correctly and its pressure shows the highest value.

Therefore, a plurality of snow pressure sensors 1. Among the pressure signals, the pressure signal showing the highest value is least affected by bridges and wind, so it is possible to accurately measure the snowfall amount using this signal.

[Effects of the Invention] The snowfall measurement method of the present invention measures the snowfall amount using the highest pressure signal among the pressure signals output by a plurality of snow pressure sensors installed at different installation heights, so the influence of bridges and wind is eliminated. As small as possible (can and can measure the correct snowfall amount.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of a state of snow accumulation measurement according to the present invention, and FIG. 2 is a sectional view of an example of a snow accumulation pressure sensor. 1...Snow pressure sensor, 3...Diaphragm, 5...
pressure sensor. Figure 1...Snow pressure sensor 3...Diaphragm 5...Pressure sensor

Claims (1)

[Claims] 1. A method for measuring snowfall amount, which is characterized in that a plurality of snowfall pressure sensors are installed at different heights, and the snowfall amount is determined by the highest pressure signal among the pressure signals output by these snowfall pressure sensors.