CN214067196U

CN214067196U - Runoff flow velocity measuring instrument for medium runoff level

Info

Publication number: CN214067196U
Application number: CN202120152580.1U
Authority: CN
Inventors: 刘海涛; 田静; 林超文; 姚莉; 郭松; 张建华; 许文志; 朱永群; 徐娅玲; 王宏; 张奇; 王谢
Original assignee: Soil and Fertilizer Research Institute SAAS
Current assignee: Soil and Fertilizer Research Institute SAAS
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2021-08-27
Anticipated expiration: 2031-01-20

Abstract

The utility model provides a runoff velocity of flow apparatus to medium runoff level, including runoff filler pipe, water catch bowl, siphon drain pipe, pressure balance baffle, buoy, stable drainage platform, water level collection analyzer. The tail end of the runoff injection pipe is communicated to the water collecting barrel, a pressure balance partition plate is arranged in the water collecting barrel and divides the water collecting barrel into a front half area and a rear half area, the tail end of the runoff injection pipe is located in the front half area, and the siphon drain pipe and the buoy are located in the rear half area. The utility model discloses greatly promoted the measuring accuracy under moderate runoff velocity of flow and the total amount condition, especially be applicable to the soil erosion and water loss observation in open-air runoff field, the observation result accuracy is high, all has great use value to scientific research, the national non-point source pollution field monitoring that soil and water kept.

Description

Runoff flow velocity measuring instrument for medium runoff level

Technical Field

The utility model belongs to velocity of flow survey device field especially relates to a runoff velocity of flow apparatus to medium runoff level.

Background

Runoff determination equipment is quite common, and the most common technologies at present are as follows:

1) the Pasteur channel and the triangular weir are matched with a water level meter for measurement, and the runoff flux is determined according to the height of the water level when the runoff flows through the cross section to calculate the final runoff.

2) The water storage method is characterized in that runoff is guided into a closed pool or is guided into the pool in proportion through a flow divider, and the water quantity in the pool is measured to be runoff quantity.

3) The tipping bucket type runoff metering method is characterized in that each time a certain amount of runoff is accumulated, a tipping bucket can overturn to empty the accumulated runoff and enter next runoff accumulation, and the final runoff is the product of the tipping bucket times and the tipping bucket accumulated runoff at each time.

The Babbitt groove and the triangular weir method are mainly used for measuring the runoff of rivers and ditches with long-term runoff. The device is suitable for large runoff measurement, the accuracy is guaranteed when the runoff is larger, and the lower limit of the flow measurement is generally 0.3 square/hour. For the case of small radial flow or frequent flow interruption, the precision is difficult to meet. In extreme cases, such as runoff water level of only 1-5mm, the measured result of the device may have several times of difference from the actual value.

The water storage pool method needs engineering construction, is high in cost and cannot move, the problem of water leakage can occur after the water storage pool is used for a long time in the field, the measurement result is influenced, meanwhile, the size of the water pool is limited, the water pool is generally smaller than 2 square, and the upper limit of the measured runoff is limited. Survey runoff upper limit problem can be solved to collocation shunt, but present common shunt also can cause the reposition of redundant personnel effect not good because of reasons such as equipment removes to there is the deviation in the final runoff survey result that leads to.

The tipping bucket type runoff meter has no runoff measurement limitation, but the equipment cannot cope with the condition of overlarge runoff rate, in most cases, the runoff is subjected to diversion treatment, then the total metering flow is measured by the tipping bucket type runoff meter, and the measurement error is enlarged when the diverter is used.

In summary, the past runoff measuring equipment is mainly used for matching a pasteurizing tank with a water level meter for large water flow such as rivers, ditches and the like, and is used for a water storage tank method with small runoff total quantity or a tipping bucket type runoff meter method with small runoff rate. For runoff measurements at moderate levels of runoff flow (0.3-10 squares/hour) and total (2-30 squares), e.g. 100m²The runoff measurement of the standard runoff field needs to be improved in the measurement precision of the existing equipment.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the defect that above-mentioned prior art exists, provide a runoff velocity of flow apparatus to medium runoff level, the utility model discloses greatly promoted the measuring accuracy under medium runoff velocity of flow and the total amount condition to improve the reliability of soil erosion and water loss observation result in open-air runoff field, all have great use value to scientific research, the national non-point source pollution field monitoring that soil and water kept.

The utility model adopts the following technical scheme:

the utility model provides a runoff velocity of flow apparatus to medium runoff level, includes runoff filler pipe, water catch bowl, siphon drain pipe, pressure balance baffle, buoy, stable drainage platform, water level collection analyzer.

The tail end of the runoff injection pipe is communicated to the water collecting barrel, a pressure balance partition plate is arranged in the water collecting barrel and divides the water collecting barrel into a front half area and a rear half area, the tail end of the runoff injection pipe is located in the front half area, and the siphon drain pipe and the buoy are located in the rear half area.

The water collecting barrel is sequentially set with the highest water level H from high to low_maxMinimum water level H_minHighest water level H_maxFlush with the top of the siphon drain pipe and at the lowest water level H_minFlush with the import of one side of siphon drain pipe, the hole that the opposite side export of siphon drain pipe passed the sump pit bottom is arranged in stabilizing the drainage platform.

Lowest water level H_minThe sediment deposition zone is as follows.

The buoy is connected with a water level acquisition analyzer arranged on one side of the water collecting barrel through a data connecting line.

The current water level H of the buoy is far from the water level H in the stable drainage platform_fThe difference is the siphon water head difference delta H_h。

The utility model has the advantages that:

the utility model solves the problem of limited capacity of the water storage tank method by continuous drainage under the siphon action.

Compared with the Babbitt bath method: the water level when the groove mouth is flowed through to the footpath through the papanicolaou groove method seeks the runoff velocity of flow, and survey precision is on the low side under the low velocity of flow, and the utility model discloses direct change through water level height in the water catch bowl calculates the runoff velocity of flow and makes the accuracy promote by a wide margin.

Drawings

Fig. 1 is a schematic structural view of the present invention;

in the figure: the system comprises a runoff injection pipe 1, a water collecting barrel 2, a siphon drain pipe 3, a pressure balance partition plate 4, a buoy 5, a stable drainage platform 6 and a water level acquisition analyzer 7.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the utility model discloses a runoff velocity of flow apparatus to medium runoff level, including runoff filler pipe 1, water catch bowl 2, siphon drain pipe 3, pressure balance baffle 4, buoy 5, stable drainage platform 6, water level collection analyzer 7.

The tail end of the runoff injection pipe 1 is communicated to the water collecting barrel 2, a pressure balance partition plate 4 is installed in the water collecting barrel 2, the water collecting barrel 2 is divided into a front half area and a rear half area by the pressure balance partition plate 4, the tail end of the runoff injection pipe 1 is located in the front half area, and the siphon drain pipe 3 and the buoy 5 are located in the rear half area.

The water collecting barrel 2 is sequentially set with the highest water level H from high to low_maxMinimum water level H_minHighest water level H_maxFlush with the top of the siphon drain pipe 3, lowest water level H_minFlush with the inlet at one side of the siphon drain pipe 3, and the outlet at the other side of the siphon drain pipe 3 passes through the hole at the bottom of the water collecting barrel and is arranged in the stable drain platform 6.

Lowest water level H_minThe sediment deposition zone is as follows.

The buoy 5 is connected with a water level collecting analyzer 7 arranged at one side of the water collecting barrel 2 through a data connecting line.

The current water level H of the buoy 2 is far from the water level H in the stable drainage platform_fThe difference is the siphon water head difference delta H_h。

The utility model discloses a working process:

external runoff enters a water collecting barrel 2 through a runoff injection pipe 1, and silt in the runoff is deposited to a silt deposition area (below the lowest water level line and used for collecting silt); along with the continuous increase of the runoff injection water level, when the water level increases to the highest water level H_maxThen, the water in the water collecting barrel 2 is drained through the siphon drain pipe 3, and the water level is reduced to the lowest water level H_minStopping draining; the water level continues to rise, siphon drainage is initiated again, the process is repeated continuously, and the water level collecting analyzer 7 records the water level change at any time to calculate the runoff flow rate and the runoff total amount.

The specific calculation scheme is as follows:

when the siphon drain pipe 3 does not drain, the water level rises to cause the volume change of the water in the water collecting bucket 2 to be the runoff flow rate.

q represents the radial flow velocity m³H, S represents the cross-sectional area m of the water collecting bucket²And the water level change rate m/s is expressed by delta H/delta t, the utility model discloses in compare the previous recording value when the water level and change 5mm, water level data and time are once taken notes to the water level acquisition analysis appearance.

When siphon drainage and runoff injection occur simultaneously, the method for calculating the runoff flow rate is relatively complex, which is also the innovation point of the utility model. The runoff injection flow rate at this time was calculated as follows:

q_hrepresents the siphon discharge rate m³The calculation formula is as follows,

in the formula, lambda siphon friction coefficient, l siphon length m, d siphon inner diameter m, xi turning head loss coefficient, g gravity acceleration 9.8 m.s^-2，ΔH_hIndicating the difference in height between the water level in the collection tank and the water level in the stable drainage platform 6 below the siphon.

Taken together, the runoff rate of the plant is calculated as

When the delta H is larger than 0, namely the water level in the water collecting barrel 2 rises, when siphon drainage does not occur, the runoff flow velocity is calculated through the volume change of the water in the water collecting barrel 2, when the delta H is smaller than or equal to 0, namely the water level in the water collecting barrel 2 falls, and when the siphon drainage occurs, the runoff flow velocity simultaneously considers the siphon drainage velocity.

The total runoff quantity Vt is calculated as follows:

Vt＝∑q_t*dt

q_trepresenting the runoff rate m between two water level determinations³The dt represents the measurement time difference s.

The utility model discloses a 3 pipe diameters of strict control inlet tube and siphon drain pipe ensure that drainage rate is higher than runoff entering speed to make the drainage process accomplish rapidly. A pressure balance clapboard 4 is arranged between the runoff injection pipe 1 and the siphon water suction port, so that the influence of the water inflow water flow to cause turbulence on the water pressure of the water outlet is reduced to be negligible. And a stable drainage platform 6 is arranged at the outlet of the siphon drainage pipe 3, so that the siphon drainage rate can be controlled and calculated. The utility model discloses in embedding the velocity of flow calculation method into water level collection analyzer 7, whether take place according to the rising of water level and decline automatic judgement siphon drainage, the runoff discharge rate can directly be surveyed to the automatic drainage rate of transferring of apparatus and water level relational expression.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A runoff flow velocity measuring instrument aiming at medium runoff level is characterized by comprising a runoff injection pipe, a water collecting barrel, a siphon drain pipe, a pressure balance partition plate, a buoy, a stable drain platform and a water level acquisition analyzer;

the tail end of the runoff injection pipe is communicated to the water collecting barrel, a pressure balance baffle is arranged in the water collecting barrel, the water collecting barrel is divided into a front half area and a rear half area by the pressure balance baffle, the tail end of the runoff injection pipe is positioned in the front half area, the siphon drain pipe and the buoy are positioned in the rear half area, the water collecting barrel is sequentially set with the highest water level H from high to low_maxMinimum water level H_minHighest water level H_maxFlush with the top of the siphon drain pipe and at the lowest water level H_minFlush with the import of one side of siphon drain pipe, the hole that the opposite side export of siphon drain pipe passed the sump drum bottom is arranged in stabilizing the drainage platform, and the buoy is connected with the water level acquisition analyzer of setting in sump drum one side through data connection line.

2. A runoff flow rate gauge for moderate levels of runoff as claimed in claim 1 wherein the minimum water level H_minThe sediment deposition zone is as follows.