JPH08177369A - Flow velocity measurement device for ground water - Google Patents
Flow velocity measurement device for ground waterInfo
- Publication number
- JPH08177369A JPH08177369A JP6320940A JP32094094A JPH08177369A JP H08177369 A JPH08177369 A JP H08177369A JP 6320940 A JP6320940 A JP 6320940A JP 32094094 A JP32094094 A JP 32094094A JP H08177369 A JPH08177369 A JP H08177369A
- Authority
- JP
- Japan
- Prior art keywords
- current
- groundwater
- depth
- flow velocity
- energizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は地下水の流向流速測定装
置に関し、特に実際に地下水が流れている地下水流脈の
深度をも検出することのできる流向流速測定装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groundwater flow velocity measuring device, and more particularly to a flow velocity measuring device capable of detecting the depth of a groundwater vein in which groundwater actually flows.
【０００２】[0002]
【従来の技術】従来、地すべりの発生しやすい地帯にお
いては、対策工事を行う際にボーリングを行い、ボーリ
ング孔内の地下水の流向流速測定が行われている。そし
て、ボーリング孔内での地下水の移動速度が極めて遅い
時、測定は次のようにして行われている。方位計と小型
ＴＶカメラとを内蔵した測定ゾンデをボーリング孔内に
降ろし、ボーリング孔内の地下水中に浮遊する微小物質
を、照明用光源で照らした状態にてＴＶカメラで撮影す
る。この撮像信号を地上側に配置されたＴＶモニタに供
給し、ＴＶモニタに映る微小物質の移動距離と時間との
関係から微小物質の移動速度と方向を測定し、地下水の
流向及び流速としている。なお、方位計は、ＴＶカメラ
がボーリング孔内でどの方位を向いているのかを知るた
めの手段であり、微小物質の移動方向を把握するために
必要である。2. Description of the Related Art Conventionally, in a region where landslides are likely to occur, boring is carried out when countermeasure work is carried out, and the groundwater flow velocity in the boring hole is measured. Then, when the moving speed of groundwater in the borehole is extremely slow, the measurement is performed as follows. A measurement sonde containing an azimuth meter and a small TV camera is dropped into the boring hole, and a microscopic substance floating in groundwater in the boring hole is photographed by the TV camera while being illuminated by a light source for illumination. This image pickup signal is supplied to a TV monitor arranged on the ground side, and the moving speed and direction of the minute substance are measured from the relationship between the moving distance and the time of the minute substance shown on the TV monitor, and are used as the groundwater flow direction and flow velocity. The azimuth meter is a means for knowing which direction the TV camera is facing in the bowling hole, and is necessary for grasping the moving direction of the minute substance.
【０００３】ところで、ボーリング孔内測定では、測定
ゾンデ部分の上下をパッカーを用いて水の移動を遮断す
ることが必要となる。また、測定ゾンデをボーリング孔
中に降下させる際に孔内水を攪拌することから、ゾンデ
を測定深度に設置した後、ボーリング孔内の地下水の状
態が流向流速測定の可能な定状状態に戻るまでには長時
間を必要とする。更に、地下水の移動は深度全般にわた
って起こるのでは無く、深度のある部分に地下水流脈が
あり、その部分で水が移動しているため、地下水流脈の
部分にゾンデが設置されてはじめて、流向流速を正確に
測定することができる。By the way, in the measurement in the boring hole, it is necessary to block the movement of water by using a packer above and below the measurement probe part. In addition, since the water inside the borehole is agitated when the measurement sonde is lowered into the borehole, the state of groundwater in the borehole returns to the normal state where the flow velocity can be measured after the sonde is installed at the measurement depth. It takes a long time to get there. In addition, the movement of groundwater does not occur over the entire depth, but there is a groundwater vein in a deep area, and water is moving in that area. The flow velocity can be measured accurately.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来方法では、測定ゾンデを地下水流脈に達するまで順次
降ろして測定して行くか、他の方法により地下水流脈の
深度を推定する必要があった。However, in the above-mentioned conventional method, it is necessary to sequentially lower and measure the measurement sonde until it reaches the groundwater vein, or to estimate the depth of the groundwater vein by another method. .
【０００５】そこで本発明は、前記のような従来の測定
方式の持つ問題点を解決し、短時間で地下水流脈の深度
を特定することができるようにして流向流速の測定を速
やかに行うことのできる地下水流向流速測定装置を提供
することにある。In view of the above, the present invention solves the problems of the conventional measuring method as described above, and enables the depth of groundwater veins to be specified in a short time so as to quickly measure the flow velocity. An object of the present invention is to provide a groundwater flow velocity measuring device capable of performing the above.
【０００６】[0006]
【課題を解決するための手段】本発明は、ボーリング孔
中にＴＶカメラ、該ＴＶカメラの向きを知るための方位
計、及び照明装置を収納した測定ゾンデを配置し、地上
側に前記ＴＶカメラからの信号を受けるモニタ用受像
器、前記方位計で測定された方位を指示する方位指示器
を配置した測定システムにおいて、前記測定ゾンデのケ
ースを第１の通電用電極とし、前記ボーリング孔から離
れた位置に第２の通電用電極を配置し、地上側には更
に、前記第１及び第２の通電用電極間に通電を行う交流
電源と、通電電流を測定する電流測定器とを備え、通電
電流の変化から地下水流脈の深度を特定する機能を有す
ることを特徴とする地下水流向流速測定装置である。According to the present invention, a TV camera, a compass for knowing the direction of the TV camera, and a measuring sonde accommodating a lighting device are arranged in a bowling hole, and the TV camera is arranged on the ground side. In a measurement system in which a monitor image receiver for receiving a signal from the device and an azimuth indicator for indicating the azimuth measured by the azimuth meter are arranged, the case of the measurement sonde serves as a first current-carrying electrode and is separated from the boring hole. The second energizing electrode is arranged at a different position, and the ground side further includes an AC power source for energizing between the first and second energizing electrodes, and a current measuring device for measuring an energizing current, It is a groundwater flow velocity measuring device having a function of identifying the depth of a groundwater vein from a change in an energizing current.
【０００７】[0007]
【作用】一般に、地下水が流れている部分は他に比べて
水分が多い部分であるため、その部分は電気伝導度が他
の部分に比べて高いことになる。本発明による地下水流
向流速測定装置においては、従来の流向流速測定装置に
交流電源用の発振回路と第２の通電用電極を付加すると
共に、測定ゾンデ自体を第１の通電用電極としてボーリ
ング孔内を移動させることで、これら第１、第２の通電
用電極間の電流が増加する傾向を示す深度を地盤中の地
下水流脈の深度として検出することができ、第１の通電
用電極の深度より地下水流脈の深度を知ることが出来
る。[Function] Generally, the portion through which groundwater flows has a higher water content than other portions, so that portion has a higher electric conductivity than other portions. In the groundwater flow velocity measuring device according to the present invention, an oscillation circuit for an AC power supply and a second current-carrying electrode are added to the conventional flow velocity measuring device, and the measurement sonde itself is used as the first current-carrying electrode in the boring hole. By moving the, it is possible to detect the depth at which the current between the first and second energizing electrodes tends to increase as the depth of the groundwater vein in the ground, and the depth of the first energizing electrode You can know the depth of groundwater flow.
【０００８】この方式によれば、従来のように、測定ゾ
ンデの深度を変えながらＴＶカメラによる映像から流速
を検出して地下水流脈の判定を繰り返し行う必要が無い
ので、ボーリング孔内の撮影領域の水の安定を何回も待
つ必要が無いことになり、極めて短時間にボーリング孔
中の地下水流脈の深度、流向流速が求まるという特徴が
ある。According to this method, it is not necessary to detect the flow velocity from the image from the TV camera and repeatedly determine the groundwater flow vein while changing the depth of the measurement probe, unlike the conventional method. There is no need to wait for the stabilization of the water in the water many times, and it is possible to obtain the depth and flow velocity of the groundwater flow in the borehole in an extremely short time.
【０００９】[0009]
【実施例】次に、本発明の一実施例を図面を参照して詳
細に説明する。図１は本発明による実施例の全体構成を
示す図である。ボーリング孔５中にはＴＶカメラ１１、
方位計１２、照明装置１３を収納した測定ゾンデ１０を
配置しており、地下水の流れによって移動する微小物体
による光の回折によって起こる光の変化はＴＶカメラ１
１で撮影される。これら光の変化点は水の移動に伴って
極めてゆっくりと移動するため、従来同様、単位時間あ
たりの移動距離から移動速度が求められ、方位計１２の
出力から移動方向も求まることになる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing the overall configuration of an embodiment according to the present invention. A TV camera 11 in the bowling hole 5,
A measurement sonde 10 accommodating an azimuth meter 12 and a lighting device 13 is arranged, and the change in light caused by the diffraction of light by a minute object that moves due to the flow of groundwater changes the TV camera 1.
Taken in 1. Since these light change points move extremely slowly as the water moves, the moving speed can be obtained from the moving distance per unit time, and the moving direction can be obtained from the output of the azimuth meter 12 as in the conventional case.
【００１０】地上側にはモニタ用受像器２１、方位指示
器２２、ビデオレコーダ２３を配置した測定システムが
配置され、測定ゾンデ１０内のＴＶカメラ１１で撮影さ
れた映像情報はビデオレコーダ２３に記録される。地下
水の流れている深度を求めるため、測定ゾンデ１０の金
属容器を第１の通電用電極１４とし、ボーリング孔５か
ら離れた位置のボーリング孔６内に第２の通電用電極１
５を配置し、発振回路による交流電源２４より第１及び
第２の通電用電極１４，１５間に通電を行う。この時の
通電電流を交流電源２４に接続した電流指示計２５で測
定すると、地下水の流れている深度では通電電流が上昇
することから地下水の流れる深度を特定することが可能
となる。On the ground side, a measuring system having a monitor image receiver 21, an azimuth indicator 22, and a video recorder 23 is arranged, and the video information captured by the TV camera 11 in the measuring sonde 10 is recorded in the video recorder 23. To be done. In order to obtain the depth of flowing groundwater, the metal container of the measuring sonde 10 is used as the first energizing electrode 14, and the second energizing electrode 1 is placed in the boring hole 6 located away from the boring hole 5.
5 is arranged, and an AC power supply 24 by an oscillation circuit is energized between the first and second energizing electrodes 14, 15. When the energizing current at this time is measured by the current indicator 25 connected to the AC power supply 24, the energizing current increases at the depth where the groundwater flows, so that the depth at which the groundwater flows can be specified.
【００１１】なお、上記説明では第２の通電用電極１５
をボーリング孔６に配置しているが、第２の通電用電極
１５はボーリング孔を掘削せずに地盤の任意の位置に設
置しても同様の効果が得られる。In the above description, the second energizing electrode 15 is used.
However, the same effect can be obtained even if the second energizing electrode 15 is installed at an arbitrary position on the ground without excavating the boring hole.
【００１２】図２は本発明により第１及び第２の通電用
電極１４，１５間の通電電流測定を行った結果の一例を
示す。地盤中の地下水が流れているような電気伝導度の
高い部分を第１の通電用電極１４が通過すると、通電電
流の測定値が上昇する現象が生じることが示されてい
る。これにより地盤中の地下水が流れている領域の深度
が求められ、地下水の流向流速測定を行う深度を速やか
に特定できることで流向流速測定を迅速に行うことが可
能となる。FIG. 2 shows an example of the result of conducting current measurement between the first and second conducting electrodes 14 and 15 according to the present invention. It has been shown that when the first current-carrying electrode 14 passes through a portion of the ground having a high electrical conductivity such as flowing groundwater, a phenomenon occurs in which the measured value of the current-carrying current rises. As a result, the depth of the area where groundwater flows in the ground is obtained, and the depth at which the groundwater flow velocity measurement is performed can be specified quickly, so that the flow velocity measurement can be performed quickly.
【００１３】[0013]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、地盤中の地下水流脈の深度を求める際に、測定
ゾンデ自体と他の電極間における通電電流測定を行うこ
とより、測定ゾンデの構造を変更すること無しに地下水
流脈の深度を速やかに検出することが可能となる。これ
は、従来のように、測定ゾンデの深度を変えながらＴＶ
カメラによる映像から流速を検出して地下水流脈の判定
を繰り返し行う必要が無く、ボーリング孔内の撮影領域
の水の安定を何回も待つ必要が無いことを意味し、極め
て短時間にボーリング孔中の地下水流脈の深度、流向流
速を測定することができるという効果が得られる。As is apparent from the above description, according to the present invention, when determining the depth of groundwater veins in the ground, by measuring the energizing current between the measuring sonde itself and other electrodes, It is possible to detect the depth of the groundwater vein quickly without changing the structure of the measuring sonde. This is the same as the conventional TV while changing the depth of the measurement sonde.
This means that it is not necessary to repeatedly determine the groundwater flow vein by detecting the flow velocity from the image captured by the camera, and it is not necessary to wait for the stabilization of the water in the imaging area within the borehole many times. The effect of being able to measure the depth and flow velocity of the groundwater stream inside is obtained.
【図１】本発明の一実施例の全体構成を示す図である。FIG. 1 is a diagram showing an overall configuration of an embodiment of the present invention.
【図２】本発明により地盤中の通電電流測定を行った結
果を示す図である。FIG. 2 is a diagram showing the results of conducting current measurement in the ground according to the present invention.
５，６ ボーリング孔 １０ 測定ゾンデ １１ ＴＶカメラ １２ 方位計 １３ 照明装置 １４ 第１の通電用電極 １５ 第２の通電用電極 5, 6 Boring hole 10 Measurement probe 11 TV camera 12 Direction meter 13 Lighting device 14 First energizing electrode 15 Second energizing electrode
Claims (1)
メラの向きを知るための方位計、及び照明装置を収納し
た測定ゾンデを配置し、地上側に前記ＴＶカメラからの
信号を受けるモニタ用受像器、前記方位計で測定された
方位を指示する方位指示器を配置した測定システムにお
いて、前記測定ゾンデのケースを第１の通電用電極と
し、前記ボーリング孔から離れた位置に第２の通電用電
極を配置し、地上側には更に、前記第１及び第２の通電
用電極間に通電を行う交流電源と、通電電流を測定する
電流測定器とを備え、通電電流の変化から地下水流脈の
深度を特定する機能を有することを特徴とする地下水流
向流速測定装置。1. A monitor image for receiving a signal from the TV camera on the ground side, in which a TV camera, a compass for knowing the direction of the TV camera, and a measurement sonde accommodating a lighting device are arranged in a borehole. And a direction indicator for indicating a direction measured by the azimuth meter, in a measurement system, the case of the measurement probe is used as a first current-carrying electrode, and a second current-carrying device is provided at a position away from the boring hole. Electrodes are arranged, and on the ground side, an alternating current power source for energizing between the first and second energizing electrodes and a current measuring device for measuring the energizing current are further provided. An apparatus for measuring groundwater flow velocity, which has a function of specifying the depth of the groundwater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6320940A JPH08177369A (en) | 1994-12-22 | 1994-12-22 | Flow velocity measurement device for ground water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6320940A JPH08177369A (en) | 1994-12-22 | 1994-12-22 | Flow velocity measurement device for ground water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08177369A true JPH08177369A (en) | 1996-07-09 |
Family
ID=18126987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6320940A Withdrawn JPH08177369A (en) | 1994-12-22 | 1994-12-22 | Flow velocity measurement device for ground water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08177369A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109898993A (en) * | 2019-03-29 | 2019-06-18 | 长江勘测规划设计研究有限责任公司 | The measurement device of groundwater velocity and direction in vertical drilling |
-
1994
- 1994-12-22 JP JP6320940A patent/JPH08177369A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109898993A (en) * | 2019-03-29 | 2019-06-18 | 长江勘测规划设计研究有限责任公司 | The measurement device of groundwater velocity and direction in vertical drilling |
| CN109898993B (en) * | 2019-03-29 | 2024-04-12 | 长江勘测规划设计研究有限责任公司 | Device for measuring flow velocity and direction of underground water in vertical drilling |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020305 |