JP2011053063A - Measuring implement of flow rate of wave overtopping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring implement of a flow rate of a wave overtopping which enables to more accurately measure a flow rate of one wave, which is a measurement target flowing into a water collecting measure, among waves generated by a hydraulic model. <P>SOLUTION: Since the measuring implement of a flow rate in a wave overtopping includes curtain members 13, 14, 15 around the periphery of a lid body 12, even if a gap is generated between an opening of the water collecting measure and the lid body 12, the gap is sealed by the curtain members 13, 14, 15 and a wave overtopping 22 from waves which are not under measurement is prevented from entering the water collecting measure 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an overtopping flow rate measuring instrument, and more particularly to an overtopping flow rate measuring instrument used in an experiment using a hydraulic model.

  In the coastal area facing the open ocean, for example, when a high wave comes in with the approach of a typhoon or the like, the wave may scatter over the revetment. When constructing roads along the coastal revetment, or when constructing large-scale facilities such as a power plant, the revetment is required to have a structure that does not cause waves to scatter on the site of the road or facility. . When designing a revetment, experiments using a hydraulic model with a reduced revetment shape are conducted in advance.

  An example of such a hydraulic model is the hydraulic model disclosed in Patent Document 1 below. In this hydraulic model, a catchment basin for overtopping flow rate measurement that measures the amount of waves beyond the revetment is arranged behind the revetment model. The waves beyond the revetment flow into the catchment and the flow rate is measured.

  Moreover, in order to accurately measure the flow rate of one wave flowing into the catchment basin, an overtopping flow rate measuring instrument is used as a lid that closes the upper opening of the catchment basin. By measuring the timing by the measurer and moving the overtopping flow rate measuring device up and down, a single wave flows properly into the catchment.

JP 2009-53024 A

  However, since the period of the wave produced by the hydraulic model is about 2 seconds, the operator needs to open and close the overtopping flow measuring instrument (lid) within 2 seconds. However, 2 seconds for the opening / closing operation (up / down operation) of the instrument for measuring the overtopping flow rate is a short time for the measurer. Close the flow rate measuring instrument (lid). As a result, the wave beyond the revetment generated by the next wave may enter the catchment basin from the gap as a wave that is not subject to measurement, leading to a reduction in measurement accuracy.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to increase the flow rate of a single wave that is a measurement target flowing into a catchment in a wave created by a hydraulic model. An object of the present invention is to provide an overtopping flow rate measuring instrument that enables accurate measurement.

  In the overtopping flow rate measuring instrument based on the present invention, it is used in a hydraulic model for measuring the flow rate of waves scattered over the revetment, and is placed on a water collecting basin provided in the hydraulic model. An apparatus for measuring the overtopping flow rate for closing the drainage basin opening, the flat lid body placed on the drainage basin opening, and attached to stand on the lid body A handle and a curtain member provided at the peripheral edge of the lid body are provided.

  In another aspect of the invention, the lid body has a rectangular shape in plan view, and the curtain member is provided on each of at least three sides of the four sides of the lid body. They are separated at the corners of the lid body.

  According to the overtopping flow rate measuring instrument based on the present invention, there is provided an overtopping flow rate measuring instrument that can more accurately measure the flow rate of a single wave that is a measurement target flowing into a catchment in a hydraulic model. It becomes possible to provide.

It is a 1st perspective view which shows the whole structure of the instrument for overtopping flow rate measurement in this Embodiment. It is a 2nd perspective view which shows the whole structure of the instrument for overtopping flow rate measurement in this Embodiment. In this Embodiment, it is a perspective view which shows 1 process for demonstrating the measuring method of the overtopping flow rate using the instrument for overtopping flow measurement. FIG. 4 is a perspective view showing a step performed after the step shown in FIG. 3 in the present embodiment. FIG. 5 is a perspective view showing a step performed after the step shown in FIG. 4 in the present embodiment. FIG. 6 is a perspective view showing a step performed after the step shown in FIG. 5 in the present embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated. In the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified.

  The instrument for measuring the overtopping flow rate in the embodiment based on the present invention is on a water collecting basin provided in a two-dimensional wave-making channel as a hydraulic model for measuring the flow rate of waves scattered over the revetment. It is placed to close the catchment opening.

(Equipment for overtopping flow measurement 10)
First, with reference to FIG. 1 and FIG. 2, the structure of the overtopping flow measuring instrument 10 in the embodiment will be described. The overtopping flow rate measuring instrument 10 includes a flat lid body 12 placed on the drainage basin opening, and a handle 11 attached so as to stand substantially at the center of the lid body 12. ing.

  In the present embodiment, the lid main body 12 has a rectangular shape (rectangular shape) in accordance with the shape of the catchment opening. The handle 11 includes a grip 11a and a support 11b. The grip 11a is provided to be slidable in the vertical direction (direction indicated by arrow F in the figure) with respect to the support 11b, and is fixed by a fixing means (not shown). The grip portion 11a is provided so as to be fixed at a predetermined position of the support column portion 11b.

  Curtain members 13, 14, and 15 are attached to three sides of the four sides of the periphery of the lid body 12, respectively. The curtain member 13, 14, 15 has a length in the hanging direction of about 15 cm to about 20 cm, and a vinyl sheet is used as the material.

  A direction indicated by an arrow A in the figure is a direction in which a two-dimensional wave making water channel is provided. In the present embodiment, a curtain member is provided on an edge on the opposite side to the side on which the two-dimensional wave making water channel is provided. Is not provided. This is because the possibility of water intrusion into the catchment basin is low from the edge on the side opposite to the side where the two-dimensional wave-making channel is provided. In addition, for the sake of completeness, it is possible to provide a curtain member at the edge on the side opposite to the side where the two-dimensional wave-making water channel is provided.

  Each curtain member 13, 14, 15 is separated at the corner of the lid body 12. This is because, when the overtopping flow rate measuring instrument 10 is placed on the upper surface of the water collecting trough, when the curtain members are connected at the corners, the expansion of the curtain members 13, 14, 15 can be limited. Because there is sex. When the curtain members 13, 14, 15 are connected at the corners of the lid main body 12, the curtain members 13, 14, 15 are spread by providing sufficient margins at the corners. It is also possible to adopt a configuration that is not limited.

(Measurement method of overtopping flow rate)
Next, a method for measuring the overtopping flow rate using the overtopping flow rate measuring instrument 10 in the present embodiment will be described with reference to FIGS. A predetermined amount of water 20 is stored in the two-dimensional wave making channel 1 used for measuring the overtopping flow rate, and the other end side (the back side of the drawing) is located at one end side (the front side of the drawing) of the wave making channel 1. A wave-making plate 2 for sending waves toward is provided. On the other end side of the wave-making waterway 1, a scaled revetment (model) 15 is disposed.

  Behind the revetment 15 is provided a water collecting basin 4 (see FIG. 5) for measuring the amount of waves exceeding the revetment 15. This catchment 4 includes a catchment 5 in the overtopping drainage channel and a site-side catchment 6. In the catchment basin 5 in the overtopping drainage channel, the amount of waves scattered on the area corresponding to the overtopping drainage channel or road provided along the revetment 15 is measured, and in the groundside drainage basin 6, it corresponds to the site of the facility. The amount of waves scattered in the area is measured. The wave exceeding the revetment 15 flows into the catchment 4 and the flow rate is measured. The total length of the two-dimensional wave-making water channel 1 is, for example, 30 m, and the depth is about 1 m.

  As shown in FIG. 3, a platform 32 having an appropriate height is installed on the side of the wave making channel 1 on the side of the revetment 15. A measurer 31 goes up on the table 32 and grasps the handle 11 of the overtopping flow rate measuring instrument 10 by hand, and the overtopping flow rate measuring instrument 10 so as to close the opening of the catchment 4 from an appropriate height of the table 32. Is placed on the water collecting basin 4.

  Next, as shown in FIG. 4, the wave 21 is generated by moving the wave making plate 2 in the longitudinal direction of the wave making water channel 1. The generated wave 21 travels along the wave-making waterway 1 toward the revetment 15. Of the waves 21 traveling toward the revetment, the opening of the water collecting basin 4 is closed with the overtopping flow rate measuring instrument 10 until a predetermined wave 21 to be measured for the flow rate reaches the revetment 15.

  At this time, the wave may reach the catchment basin 4 beyond the revetment 15, but the catchment basin 4 is blocked by the overtopping flow rate measuring instrument 10, and the opening and lid of the catchment basin 4 are covered. Even when there is a gap between the main body 12 and the curtain members 13, 14, 15, the gap is blocked, so that waves that are not subject to measurement cannot enter the catchment 4. Absent.

  Next, as shown in FIG. 5, the overtopping flow rate measuring instrument 10 is lifted to a predetermined height in accordance with the timing when the wave 21 having a predetermined height approaches the revetment 15, and the opening of the water collecting basin 4 is exposed. It is confirmed that a predetermined wave 21 collides with the revetment 15 and scatters over the revetment 15 and the overtopping wave 22 is taken into the water collecting basin 4 from the opening, and as shown in FIG. Is covered with the overtopping flow rate measuring instrument 10.

  The time for exposing the opening of the water collecting basin 4 is about 2 seconds. Therefore, when the measurer 31 rushes and closes the opening of the water collecting basin 4 with the overtopping flow rate measuring instrument 10, a gap may be formed between the opening of the water collecting basin 4 and the lid body 12. Even in such a case, since the curtain members 13, 14, 15 are provided on the periphery of the lid body 12, the gap is closed by the curtain members 13, 14, 15, so The overtopping wave 22 does not enter the catchment 4.

  Thereafter, the amount of water accumulated in the water collecting basin 4 is measured. In this way, it is possible to accurately measure the flow rate of the overtopping wave 22 that has passed over the revetment 15 by the single wave 21 to be measured.

  As described above, according to the overtopping flow rate measuring instrument 10 in the present embodiment, the curtain member 13 is formed on the periphery of the lid body 12 even when a gap is generated between the opening of the water collecting trough 4 and the lid body 12. , 14, 15 are provided, the gap is closed by the curtain members 13, 14, 15, and the overtopping 22 due to the waves not to be measured does not enter the catchment 4. As a result, it is possible to more accurately measure the flow rate of a single wave that is a measurement target flowing into the catchment in the hydraulic model.

  The embodiment disclosed this time is an example, and the present invention is not limited to this. The present invention is defined by the terms of the claims, rather than the scope described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Wave-making channel, 2 Wave-making board, 4 Water collecting basin, 5 Water collecting basin in an overtopping drainage channel, 6 Site side water collecting basin, 10 Overtopping flow measuring instrument, 11 Handle, 11a Grasp part, 11b Strut part, 12 Cover body, 15 revetment, 20 water, 21 waves, 22 wave overtopping, 31 measurers, 32 units.

Claims (2)

Used for hydraulic model to measure the flow rate of waves scattered over the revetment, and placed on the catchment provided in the hydraulic model, for overtopping flow measurement to block the catchment opening An instrument,
A plate-like lid body (12) placed on the water collecting trough opening;
A handle (11) attached to stand on the lid body (12);
Curtain members (13, 14, 15) provided on the peripheral edge of the lid body (12);
An instrument for measuring the overtopping flow rate. The lid body (12) is rectangular in plan view,
The curtain member (13, 14, 15) is provided on each of at least three sides of the four sides of the lid body (12),
The overtop flow rate measuring instrument according to claim 1, wherein each curtain member (13, 14, 15) is separated at a corner of the lid body (12).

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