CN101038198A - Monitoring method of reservoir level - Google Patents
Monitoring method of reservoir level Download PDFInfo
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- CN101038198A CN101038198A CN 200710067265 CN200710067265A CN101038198A CN 101038198 A CN101038198 A CN 101038198A CN 200710067265 CN200710067265 CN 200710067265 CN 200710067265 A CN200710067265 A CN 200710067265A CN 101038198 A CN101038198 A CN 101038198A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 119
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000013307 optical fiber Substances 0.000 claims abstract description 28
- 238000004804 winding Methods 0.000 claims abstract description 14
- 239000003643 water by type Substances 0.000 claims description 48
- 230000011218 segmentation Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 3
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- 239000010959 steel Substances 0.000 description 14
- 238000005259 measurement Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 238000010438 heat treatment Methods 0.000 description 3
- 230000009897 systematic effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 230000002547 anomalous effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
A water level monitoring method of the reservoir by adopting a distributed optical fibre temperature sensor system (DTS) is provided in the present invention. The method includes the following steps: 1) a pipe one end of which is exposed in the air is positioned in the reservoir; 2) the optical cables are laid on the pipes to insure that one end of the optical cable can be connected to the host of the distributed optical fibre temperature sensor; 3)the optical cable can be winded around side pipe by different subsections according to the different requirement of the measuring precision in different water level range; 4) the temperature of each monitoring point on the whole optical cable is measured by the DTS system and the space temperature change value of each monitoring point is calculated by performing derivation calculus of the distance between the points and the position of the optical cable corresponding to the point the temperature change of which is the biggest is the water level of the reservoir. In the present invention, the water level of the reservoir can be monitored quickly and accurately by using the DTS system. And a high precision and low cost monitoring is realized by adopting a subsections winding cable laying method on the premise that the requirement of the measuring of the DTS system is satisfied, thus, the requirement of the water level monitoring in hydraulic engineering is satisfied.
Description
Technical field
The present invention relates to a kind of water level monitoring method, especially, relate to a kind of method of utilizing distributed optical fiber temperature sensor (DTS) system to carry out the reservoir level monitoring.
Background technology
In hydraulic engineering, it is the emphasis of the hydrology, hydraulic department that reservoir level is measured always, if do not carry out effective water level monitoring in advance, then running under the anomalous weather situations such as flood, typhoon, serious accident will happen occasionally to cause Jiang Di to burst because water level reaches warning line, big flood destroys by rush of water dykes and dams etc., brings tremendous loss for thus the country and people's lives and properties.On the other hand, measure the temperature of different depth water layer, will play good directive function for the utilization of water resource, under situation about allowing in technology, the water layer that temperature is lower can be used for cooling off, and the water layer that temperature is suitable can be used for irrigating or the like.Therefore, carry out accurately and effectively real time water level monitoring, effective utilization of trouble-saving generation and water resource is had significance.
Existing reservoir level is measured and is adopted various sensor technologies, common have ultrasonic detector, differential level sensor, float-type level sensor or the like, though these traditional modes can realize water level monitoring, but all there is certain limitation, the installation requirement of water level gauge is higher, and the improvement of system need drop into bigger cost, and the precision of monitoring is lower, measurement range is restricted, and can not satisfy the constantly needs of development of modernization project.
Distributed optical fiber temperature sensor (DTS) system is based on the principle of advanced optical time domain reflection (OTDR) technology and the Raman scattering temperature effect dorsad of optical fiber, with optical fiber is carrier, being closed by main frame, sensing optic cable and other enclosure group and to form, is developed recently a kind of new and high technology that is used for real-time monitoring temperature field of getting up in the world.
I am that formerly patent of invention " dam leakage positioning distributed fibre-optical temperature sensing monitor and method ", publication number are that China of 200510050546.9 has formerly all utilized distributed optical fiber temperature sensor (DTS) to realize the monitoring and the security protection of engineering project in the patent of invention " Pipeline Leakage Positioning Distributed Optical Fiber Temperature Sensing ﹠ Monitoring Device and method " for China of 200310122784.7 at publication number.In the monitoring method of above-mentioned patent, the main heating arrangement that adopts is to the optical fiber metallic sheath or be arranged on conductor dbus electrical heating in the optical cable, make the optical fiber environment temperature raise, after distributed optical fiber temperature sensor (DTS) systematic survey goes out temperature on the whole piece optical cable, the differentiate of adjusting the distance again, the space temperature that just can obtain each point on the optical cable changes.When a certain operate outside point occurrence temperature on the optical fiber direction changes, the heating optical fiber with will produce certain temperature difference on every side, this temperature difference causes the variation of fiber optic temperature field, distributed optical fiber temperature sensor (DTS) system monitoring by comparison and analysis to the temperature distribution history of whole piece optical cable, can be found and definite liquid, tracheae line leak residing position behind the corresponding signal.
At present, international, domesticly the distributing optical fiber sensing technology successfully is applied to all kinds of engineering projects, particularly in the safety monitoring of large water conservancy hydroelectric engineering, as seepage flow and leakage monitoring etc. in the temperature monitoring of dam concrete solidification process, the dam.
The temperature of water in the reservoir at the different depth place has certain difference, but such difference variation is not too large, generally in ± 0.4 ℃/m; In single air, space temperature changes also less, generally within ± 0.2 ℃/m.And there are certain difference in water temperature and air themperature, especially at the surface level place, it is the interface place of water and air, space temperature changes maximum, usually＞2 ℃/m, therefore, can utilize distributed optical fiber temperature sensor (DTS) system to judge water level at the temperature value at different depth place by measuring reservoir.
Summary of the invention
Technical matters to be solved by this invention is a kind of employing distributed optical fiber temperature transducer system to be provided and to satisfy high precision, reservoir level monitoring method cheaply at above-mentioned prior art present situation.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: this reservoir level monitoring method, and it is characterized in that adopting distributed optical fiber temperature transducer system to monitor the temperature variation of optical cable, may further comprise the steps:
(1) pipe is set in reservoir, pipe one end is exposed in the air;
(2) with optical cable laying on described pipe, one end of assurance optical cable places through the reservoir bottom of demarcating or other is with reference to Jiao, the other end of optical cable is exposed in the air, and optical cable is exposed at the airborne other end and is connected with the main frame of described distributed optical fiber temperature sensor;
(3) according in the different height of water level scopes to the different requirements of measuring accuracy, optical cable is wrapped on the described pipe with the different spacing segmentation, the interior optical cable of the height of water level scope of correspondence measuring accuracy requirement high (being that measuring error is little) twines spacing less (being that the optical fiber winding is tight), and corresponding measuring accuracy requires the interior optical cable of the height of water level scope of low (being that measuring error is big) to twine spacing (being that the optical fiber winding is sparse) greatly;
(4) measure the temperature of each monitoring point on the whole piece optical cable by distributed optical fiber temperature transducer system after, again to each monitoring point correspondence apart from differentiate, can obtain the space temperature changing value of each monitoring point on the optical cable;
(5) corresponding optical cable is the reservoir level that need record in position, the pairing monitoring point of space temperature changing value maximum point.
Because distributed optical fiber temperature transducer system itself has certain restriction to the detection length of optical cable, adopt the canoe of front and back circle close proximity can not satisfy the measurement requirement of system to the pipe bottom to head optical cable always, if the optical cable straight line is laid, can not reach the accuracy requirement of measurement again, therefore, in order to satisfy the measurement parameter requirement of detection system, reduce and measure cost, the paving mode of described optical cable on pipe is as follows:
In the height of water level scope of not doing the measuring accuracy requirement,, optical cable directly can be laid along the pipe straight line as slough and the zone more than the maximum water level;
In the height of water level scope that has measuring accuracy to require, comprise warning line line, safe water bit line etc., optical cable can be close to pipe and twine, the optical cable front and back are not overlapping between enclosing, and determine the concrete canoe of optical cable in different waters sections by following formula
Promptly in the different waters section that has measuring accuracy to require, with optical cable with D
iBe average headway, one encloses and is wrapped on the described pipe,
Wherein, i represents the pairing different waters of different height of water level scopes section, and i is a natural number, can cut apart several waters sections according to actual requirement of engineering; D
iBe illustrated in the section of i waters, be wrapped in the mean distance of the optical cable two adjacent rings centreline spacing on the pipe; Δ H
iBe illustrated in the height of water level H in the section of described i waters
iMeasuring error; Δ L
iRepresent in the altitude range corresponding optical cable coiling length L with described i waters section
iMeasuring error; C
iBe illustrated in the section of described i waters, optical cable twines the average perimeter of pipe one circle; α represents the inclination angle of pipe and surface level.
Described optical cable two adjacent rings centreline spacing can be wrapped on the pipe by any-mode in the section of the i waters of correspondence, but, for the ease of the complexity of engineering survey and reduction data computation and processing, can be with optical cable by the center line mean distance D that calculates
iBeing wrapped in equably on the described pipe, promptly in the section of i waters, is equidistant winding between the last circle center line of optical cable and the back one circle center line.
Described pipe can be selected steel pipe or engineering plastics pipe etc., also can be the long straight tube of pipe or rectangular tube or three cornues or other any xsect, as long as can realize optical cable winding in the above easily, in addition, consider the convenience of construction and the needs of maintenance, described pipe can be arranged in the water like this: pipe one end is near described reservoir bottom, the pipe other end is near reservoir dam, the inclination alpha span of pipe and reservoir bottom is 0～90 °, is good with 90 degree preferably.
Compared with prior art, the invention has the advantages that: with the method for optical fiber temperature probe monitoring water level, promptly measured the temperature value of different depth water level, can orient reservoir level fast and accurately again, can satisfy in the hydraulic engineering requirement water level monitoring.As the case may be accuracy requirement in this monitoring method, by adopting different optical cable laying modes in different waters section, not only satisfied measuring accuracy but also reduced the optical cable laying cost, can realize wider measurement range and obtain higher measuring accuracy than the mode of traditional measurement water level.
Description of drawings
Fig. 1 is reservoir level measuring principle figure of the present invention.
Fig. 2 is the reservoir level instrumentation plan of the embodiment of the invention.
Fig. 3 is the optical cable canoe synoptic diagram of the embodiment of the invention.
Fig. 4 is the optical cable temperature distributing curve diagram of the embodiment of the invention.
Fig. 5 is another optical cable temperature distributing curve diagram of the embodiment of the invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Water is the most obvious in the temperature difference at the place, plane of water and air handing-over in the reservoir, we judge the principle of water level be exactly the size that changes with the optical cable space temperature that is arranged in the reservoir be foundation, can be used for judging water level by distributed temperature sensor (DTS) systematic survey optical cable at the temperature value of reservoir different depth, basic step is as follows:
At first, a pipe is set in reservoir, pipe one end is exposed in the air.
Secondly, on described pipe, an end that guarantees optical cable places reservoir bottom or other reference point through demarcating with optical cable laying, and the other end of optical cable is exposed in the air, and optical cable is exposed at the airborne other end and is connected with described DTS system host.
Then, according in the different height of water level scopes to the different requirements of measuring accuracy, optical cable can be wrapped on the described pipe with the different spacing segmentation, concrete canoe can be in such a way:
As shown in Figure 1, the pipe 1 that is tied with optical cable inserts in the water, with the reference field parallel 3 with surface level as with reference to base plane, pipe 1 and reference field 3 formation one angle α.Supposing that the reservoir level height can be divided into several waters sections, wherein, is M at altitude range
iI waters section in, we set up the plane geometry relation that is made of pipe 1, reservoir dam 2 and reference field 3 with following formula,
Wherein, i is several waters sections fixed according to actual conditions, and the i value is 1,2,3 ..., the natural number of n; L
iBe the winding total length of optical cable in the section of i waters; C
iBe altitude range M at corresponding i waters section
iIn, optical cable twines the average perimeter of pipe one circle; D
iBe the average headway between the circle, the then number of turns of optical cable winding before and after the optical cable winding
Multiply by average headway D
iBe the length h of pipe in this i waters section
i
On the basis of formula (1), we further obtain the formula of following calculating reservoir level:
H
x＝h
x×sinα (2)
Wherein, H
xBe actual height of water level, h
xBe the tube length to actual water level X, be the tube length sum that is tied with optical cable in each following waters section of actual water level X from reference field 3;
Because there is certain error in actual measurement,, there is following measuring accuracy to require: optical cable coiling length L if in this i waters section
iMeasuring error be Δ L
i, height of water level H
iMeasuring error be Δ H
i, our measuring error principle and in conjunction with described formula (1) can obtain following formula:
Promptly basis is to optical cable coiling length L
i, height of water level H
iCorresponding respectively different measuring error requirements Δ L
i, Δ H
i, can determine that in i waters section, corresponding length be h
iPipe on, the winding space D of optical cable two adjacent rings
iDifferent value;
According to formula (3) as can be known, optical cable winding spacing is little in the height of water level scope of corresponding measuring accuracy requirement high (being that measuring error is little), corresponding measuring accuracy requires the interior optical cable winding of the height of water level scope spacing of low (being that measuring error is big) big, in the waters section of not doing the measuring accuracy requirement, the optical cable straight line can be laid on the pipe, and need not arrange optical cable in the mode of twining.
Since in the section of different waters corresponding different tube length, so, according to aforementioned manner respectively with different space D
iOptical cable is wrapped on the pipe, goes out the temperature of each monitoring point on the whole piece optical cable by the DTS systematic survey, again to each monitoring point correspondence apart from after the differentiate, can obtain the space temperature changing value of each monitoring point on the optical cable.
At last, according to the further analysis of distributed optical fiber temperature transducer system, can obtain optical cable and be the reservoir level that need record in position, the pairing monitoring point of space temperature changing value maximum point.
Below in conjunction with actual engineering survey example, described reservoir level monitoring method is further described in detail.
As shown in Figure 2, in the dark reservoir 2 of about 300m steel pipe 1 ' is set vertically, is tied with optical cable on the steel pipe 1 ', wherein, steel pipe 1 ' radius R=50mm, the diameter of optical cable are D '=2mm; With steel pipe 1 ' one end with the reservoir bottom surface 3 ' parallel with surface level as with reference to the plane, the steel pipe 1 ' other end surfaces, angle α=90 of steel pipe 1 ' and reservoir bottom surface 3 ' °.
In the application of fibre optic temperature sensor monitoring water level, we use the DTS system of parameter as described in Table 1 to come measuring water temperature:
Table 1
| Detect length | 8Km |
| Measure temperature range | -100℃～400℃ |
| Temperature is rate respectively | 0.1℃ |
| The space is rate respectively | 1m |
| Sampling interval | 0.5m |
Because the restriction of the examined length parameter of DTS system, if closely contact and be not wrapped in overlappingly on the steel pipe 1 ' between optical cable and the optical cable, we calculate the total length of required winding optical cable according to following formula
Wherein, reservoir depth H=300m, steel pipe radius R=50mm, the circle spacing is optic cable diameter D '=2mm before and after the optical cable, can obtain optical cable winding total length L after respectively in the substitution formula (4) and be about 47124m, the requirement for the DTS system of this length is very high, needs very high cost, can't widespread usage, the therefore canoe of needs improvement optical cable.
As shown in table 2, according to the requirement of user to level measuring, we are divided into 7 waters sections by the reservoir that 300m is dark, be that described i value is respectively 1,2,3,4,5,6,7, the measuring error of known cable length all equates at each waters section, be Δ L=1m, and the altitude range M of each waters section
iAs follows respectively with measuring error:
The measuring accuracy of table 2 customer requirements
| The waters section | Altitude range M i(m) | Measuring error Δ H i(mm) | |
| 1 | 0-107 | Do not require | The |
| 2 | 107-113 | ＜10 | 110m is a |
| 3 | 113-200 | ＜30 | - |
| 4 | 200-277 | ＜50 | - |
| 5 | 277-283 | ＜10 | 280m is a warning line |
| 6 | 283-300 | ＜30 | - |
| 7 | ＞300 | Do not require | 300m is a peak level |
As shown in Table 2, when reservoir level less than 107m (lowest water level line H
Min) or greater than 300m (maximum water level H
Max) time, promptly water level is in the 1st waters section or the 7th waters section, at this moment the measuring accuracy of water level is not done requirement, and optical cable only needs to get final product along the laying of pipe straight line, promptly
Work as i=1: measuring error is not done requirement, and optical cable is along the steel pipe straight-run;
Work as i=7: measuring error is not done requirement, and optical cable is along the steel pipe straight-run.
And in the 2nd～6 waters section, measuring error is had different requirements, wherein, include warning line line W respectively at the 2nd waters section and the 5th waters section
1With warning line line W
2, when water level is lower than warning line line W
1Perhaps be higher than warning line line W
2The time, the DTS system monitoring needs to report to the police behind water level.
The optical cable that we utilize formula (3) to calculate in the 2nd～6 each waters section twines spacing, can obtain following result:
Work as i=2: require Δ H
2＜10mm gets D by (2) formula
1＜3.14mm gets D
1'=3mm;
Work as i=3: require Δ H
3＜30mm gets D by (2) formula
2＜9.43mm gets D
2'=9mm;
Work as i=4: require Δ H
4＜50mm gets D by (2) formula
3＜15.7mm gets D
3'=15mm;
Work as i=5: require Δ H
5＜10mm gets D by (2) formula
4＜3.14mm gets D
4'=3mm;
Work as i=6: require Δ H
6＜30mm gets D by (2) formula
5＜9.43mm gets D
5'=9mm.
The D that asks
1～D
5Be the theoretical value of trying to achieve, D according to formula (2)
1'～D
5' be actual value, we with optical cable according to D
1'～D
5' actual value be wrapped in equably on the pipe of respective heights scope respectively.
According to new optical cable canoe, we can try to achieve the interior optical cable coiling length L of the 2nd～6 waters section respectively by formula (1)
2～L
6,
Wherein, M
2=113-107=6m, M
3=200-113=87m, M
4=277-200=77m, M
5=283-277=6m, M
6=300-283=17m; C
i=2 π R=2 * 3.14159 * 0.002=0.01256636m; Sin α=sin90 °=1, with above-mentioned each value and D
1'～D
5' in the substitution formula (4), the H here is respectively by M
2～M
6Replace, concrete result of calculation such as table 3 are listed:
The optical cable laying mode of each waters section of table 3
| The waters section | Calculated value D i(mm) | Actual value D i’(mm) | Need to lay fiber lengths L i(m) | Remarks |
| 1(0-107m) | - | - | 107 | Lay along the steel pipe straight line |
| 2(107-113m) | 3.14 | 3 | 629 | Optical cable two adjacent rings distance is 3mm |
| 3(113-200m) | 9.43 | 9 | 3037 | Optical cable two adjacent rings distance is 9mm |
| 4(200-277m) | 15.7 | 15 | 1613 | Optical cable two adjacent rings distance is 15mm |
| 5(277-283m) | 3.14 | 3 | 629 | Optical cable two adjacent rings distance is 3mm |
| 6(283-300m) | 9.43 | 9 | 594 | Optical cable two adjacent rings distance is 9mm |
| 7(＞300m) | - | - | 54 | Lay (to the DTS main frame) along the steel pipe straight line |
Cable length addition with the different waters section of trying to achieve needs can obtain the optical cable total length that total system needs
Be L=107+629+3038+1613+629+594+54=6663m, can get thus, the water level of the reservoir that monitoring 300m is dark, if will satisfy the desired precision of client, the optical cable that needs 6663m altogether can use one to satisfy as the detection length of the attached parameter request of table 1 and carry out the monitoring of water level as the single channel DTS system of 8km.
During actual laying, can select to detect the binary channels DTS system that length is 4km, two optical cables are laid on the same steel pipe according to the requirement of table 3 respectively.Wherein, the optical cable of passage 1 is used for measuring the water level of the 4th waters section to the 7 waters sections, altogether light requirement cable 3090m (containing 200 meters vertically lays to the optical cable of DTS main frame); The optical cable of passage 2 is used for measuring the water level in 3 zones, the 1st zone to the, altogether light requirement cable 3773m.
Simultaneously, for improving measuring accuracy, reduce the influence of contingency factor, we are not less than 5 times measurement, get its mean value then.When reservoir level when 245m (the 4th waters section), when measuring passage 1 with DTS, the optical cable Temperature Distribution that obtains is as shown in Figure 4; When reservoir level was 110m (the 2nd waters section), when measuring passage 2 with DTS, the optical cable Temperature Distribution that obtains as shown in Figure 5.
Therefore, can see that optical cable changes maximum at 2146m place space temperature according to the temperature distribution history of Fig. 4, by formula (4) and formula (5) to calculate, the corresponding water level in 2146m place is 245.073m, with the error of actual water level 245m be 7.3mm, satisfy desired precision.In like manner, by the temperature distribution history of Fig. 5, can obtain optical cable and change maximum at 3354m place space temperature, drawing the water level corresponding at the 3354m place by formula (3) and formula (4) is 109.989m, with the error of actual water level 110m be 1.1mm, satisfy desired measuring accuracy.
Claims (5)
1, a kind of monitoring method of reservoir level is characterized in that: adopt the temperature variation of distributed optical fiber temperature transducer system monitoring optical cable, may further comprise the steps:
One pipe is set in reservoir, and pipe one end is exposed in the air;
On described pipe, an end that guarantees optical cable places reservoir bottom or other reference point through demarcating with optical cable laying, and the other end of optical cable is exposed in the air, and optical cable is exposed at the airborne other end and is connected with the main frame of described distributed optical fiber temperature sensor;
According in the different height of water level scopes to the different requirements of measuring accuracy, optical cable is wrapped on the described pipe with the different spacing segmentation, the spacing that optical cable twines in the height of water level scope that corresponding measuring accuracy is had relatively high expectations is less, and corresponding measuring accuracy requires the spacing that optical cable twines in the low height of water level scope bigger;
Measure the temperature of each monitoring point on the whole piece optical cable by distributed optical fiber temperature transducer system after, again to each monitoring point correspondence apart from differentiate, obtain the space temperature changing value of each monitoring point on the optical cable;
Corresponding optical cable is the reservoir level that need record in position, the pairing monitoring point of space temperature changing value maximum point.
2, the monitoring method of reservoir level according to claim 1 is characterized in that: the paving mode of described optical cable on pipe is as follows:
In the height of water level scope of not doing the measuring accuracy requirement, optical cable is laid along the pipe straight line;
In the height of water level scope that has measuring accuracy to require, optical cable is close to pipe and is twined, and is not overlapping between the circle before and after the optical cable, and determines the concrete canoe of optical cable in different waters sections by following formula
Promptly in the different waters section that has measuring accuracy to require, with optical cable with D
iBe average headway, one encloses and is wrapped on the described pipe,
Wherein, i represents the pairing different waters of different height of water level scopes section, and i is a natural number; D
iBe illustrated in the section of i waters, be wrapped in the mean distance of the optical cable two adjacent rings centreline spacing on the pipe; Δ H
iBe illustrated in the height of water level H in the section of described i waters
iMeasuring error; Δ L
iRepresent in the altitude range corresponding optical cable coiling length L with described i waters section
iMeasuring error; C
iBe illustrated in the section of described i waters, optical cable twines the average perimeter of pipe one circle; α represents the inclination angle of pipe and surface level.
3, the monitoring method of reservoir level according to claim 2 is characterized in that: described optical cable two adjacent rings centreline spacing D
iIn the section of the i waters of correspondence is impartial, and promptly optical cable is in this height of water level scope, and the last circle center line of optical cable and back one circle are equidistant winding between the center line.
4, the monitoring method of reservoir level according to claim 1 is characterized in that: described pipe is the long straight tube of pipe or rectangular tube or three cornues or other xsect.
5, the monitoring method of reservoir level according to claim 1, it is characterized in that: described pipe is to be arranged on like this in the water: pipe one end is near described reservoir bottom, the pipe other end is near reservoir dam, and the inclination alpha value of pipe and reservoir bottom is 90 degree.
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|---|---|---|---|
| CNB2007100672653A CN100494918C (en) | 2007-02-13 | 2007-02-13 | Monitoring method of reservoir level |
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|---|---|---|---|
| CNB2007100672653A CN100494918C (en) | 2007-02-13 | 2007-02-13 | Monitoring method of reservoir level |
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| CN100494918C CN100494918C (en) | 2009-06-03 |
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