CN114778385A - Method for calculating seawater suspended sediment source strength generated by laying submarine cable - Google Patents
Method for calculating seawater suspended sediment source strength generated by laying submarine cable Download PDFInfo
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- CN114778385A CN114778385A CN202210348902.9A CN202210348902A CN114778385A CN 114778385 A CN114778385 A CN 114778385A CN 202210348902 A CN202210348902 A CN 202210348902A CN 114778385 A CN114778385 A CN 114778385A
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- 239000013535 sea water Substances 0.000 title claims abstract description 83
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- 238000012544 monitoring process Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
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- 238000002474 experimental method Methods 0.000 claims description 8
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a method for calculating the strength of a seawater suspended sediment source generated by laying a submarine cable, which comprises the following steps: s1, fixing the turbidity meter on the submarine cable trench ditching equipment, and monitoring the suspended sediment turbidity of the seawater near the submarine cable trench in real time by the turbidity meter after the submarine cable is laid; s2, obtaining the real-time concentration of the suspended sediment of the seawater according to the relation between the turbidity of the suspended sediment of the seawater and the concentration of the suspended sediment; and S3, multiplying the real-time suspended sediment concentration by the jet flow of the submarine cable trench ditching equipment, and calculating to obtain the seawater suspended sediment source strength generated by laying the submarine cable in real time. According to the method, the turbidity meter is only fixed on the submarine cable trench ditching equipment, the real-time monitoring of the turbidity of the suspended sediment near the submarine cable trench can be realized, the source strength of the suspended sediment generated by laying the submarine cable can be calculated through monitoring results and theoretical analysis, the problem that the source strength of the suspended sediment generated by laying the submarine cable is difficult to determine can be solved, and the method has important significance for researching the environmental influence actually generated by the construction activities of the submarine cable trench excavation operation of ocean engineering.
Description
Technical Field
The invention belongs to the technical field of offshore wind power engineering, and particularly relates to a method for calculating the strength of a seawater suspended sediment source generated by laying a submarine cable.
Background
With the rapid increase of the demand for new energy in China, offshore wind power projects in coastal waters such as Guangdong, Fujian, Zhejiang, Shanghai, Jiangsu, Liaoning and the like are rapidly increased, and are developing from the near shore to the deep open sea. Submarine cable laying operation that offshore wind power engineering construction relates to can disturb the bottom, submarine cable ditch excavation operation can disturb the bottom when submarine cable lays promptly, the high muddy water mass of suspension silt that produces from this transports and spreads under hydrodynamic force condition, increase the concentration of peripheral water body suspension silt, influence ocean water environmental quality and water ecosystem health, threaten aquatic animal and plant survival, therefore the diffusion law of construction suspension silt that submarine cable laid the production and to the influence of ocean ecological environment be one of the key point of offshore wind power project environmental impact evaluation concern, also obtain the attention of many scholars, it has the significance to research suspension silt diffusion law and the influence to the ocean ecological environment to accurately master the suspension silt diffusion source strength that ocean engineering construction caused.
The method has the advantages that the field observation research work is carried out by some scholars at home and abroad for the strong diffusion source of the suspended sediment caused by the fixed-point operation construction such as dredger dredging, dredger dumping, hydraulic fill overflow and the like, and an analogy basis is provided for the subsequent scholars to carry out similar engineering suspended sediment diffusion simulation. However, for the excavation operation of the submarine cable trench related to offshore wind power engineering construction, field observation aiming at the suspended sediment source strength caused by the excavation operation is not carried out at home and abroad at present, the excavation operation is calculated by adopting an empirical formula, and field observation data is not used as a support.
Disclosure of Invention
The invention provides a method for calculating the seawater suspended sediment source strength generated by laying a submarine cable, which can solve the problem of difficulty in determining the seawater suspended sediment source strength during laying the submarine cable in an offshore wind power project and has important significance for researching the environmental influence actually generated by construction activities of ocean engineering.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for calculating the strength of a seawater suspended sediment source generated by laying a submarine cable comprises the following steps:
s1, fixing the turbidity meter on the submarine cable trench ditching equipment, and monitoring the suspended sediment turbidity of the seawater near the submarine cable trench in real time by the turbidity meter after the submarine cable is laid;
s2, obtaining the real-time suspended sediment concentration of the seawater according to the relation between the suspended sediment turbidity of the seawater and the suspended sediment concentration;
and S3, multiplying the real-time concentration of the suspended sediment by the jet flow of the submarine cable trench ditching equipment, and calculating to obtain the seawater suspended sediment source strength generated by laying the submarine cable in real time.
Further, in step S1: the submarine cable trench ditching equipment is a hydraulic jet type embedded plough, a turbidity meter is fixed on a ski board of the hydraulic jet type embedded plough through a bracket, and the turbidity meter is close to a ditching knife of the hydraulic jet type embedded plough.
Further, in step S2: through carrying out the calibration experiment of the suspended sediment turbidity and the suspended sediment concentration of the seawater, the relational expression of the suspended sediment turbidity and the suspended sediment concentration of the seawater is obtained.
Further, in step S2: the calibration experiment comprises two modes of on-site calibration and indoor calibration.
Further, in step S2: the on-site calibration specifically includes that the seawater on-site monitoring of the turbidity meter is multiple, the suspended sediment turbidity data correspond to the suspended sediment concentration of the corresponding water sample synchronously collected by the same water layer respectively, and then the suspended sediment turbidity of the seawater is calibrated to obtain the relational expression of the suspended sediment turbidity and the suspended sediment concentration of the seawater.
Further, in step S2: indoor demarcation specifically is put a quantitative clear water in the calibration tank, later lay the sea area bed material silt of department of collection and divide the clear water of putting into the calibration tank many times, and constantly mix, measure the suspension silt turbidity of misce bene back water through the turbidity meter after putting sea area bed material silt once, and get near a quantitative water sample of turbidity meter in the calibration tank this moment, calculate suspension silt concentration with the weighing method, along with the increase of water suspension silt turbidity, so carry out the same operation of several times, obtain the suspension silt turbidity of sea water and the relational expression of suspension silt concentration.
Further, in step S2: indoor demarcation specifically lays the submarine cable of gathering and locates that sea area bed material silt is whole to put into the calibration inslot, later to adding the clear water many times in the calibration inslot, and constantly mix, measure the suspension silt turbidity of misce bene back water through the turbidity meter after every adding a clear water, and get near the next quantitative water sample of turbidity meter in the calibration inslot this moment, calculate suspension silt concentration with the weighing method, along with the reduction of water suspension silt turbidity, so carry out the same operation of several times, obtain the suspension silt turbidity of sea water and the relational expression of suspension silt concentration.
Further, in step S2: the volume of the taken water sample near the turbidity meter in the calibration tank is 500-600 mL.
Further, in step S2: obtaining the real-time suspended sediment concentration of the seawater according to a relational expression between the suspended sediment turbidity of the seawater and the suspended sediment concentration, specifically, inputting the obtained relational expression between the suspended sediment turbidity of the seawater and the suspended sediment concentration into a data processing system of a turbidity meter, and automatically calculating by the data processing system of the turbidity meter according to the real-time monitored suspended sediment turbidity of the seawater near the submarine cable trench; or, according to the relation between the turbidity of the seawater suspended sediment and the concentration of the suspended sediment obtained by calibration, the real-time concentration of the suspended sediment in the seawater is obtained through manual calculation.
Further, in step S3: the jetting flow is provided by the high pressure water pump design flow of the hydraulic jetting type embedded plough.
Compared with the prior art, the invention has the beneficial effects that:
the method for calculating the seawater suspended sediment source strength generated by laying the submarine cable comprises the following steps: s1, fixing the turbidity meter on the submarine cable trench ditching equipment, and monitoring the suspended sediment turbidity of the seawater near the submarine cable trench in real time by the turbidity meter after the submarine cable is laid;
s2, obtaining the real-time suspended sediment concentration of the seawater according to the relation between the suspended sediment turbidity of the seawater and the suspended sediment concentration; s3, multiplying the real-time suspended sediment concentration by the jet flow of the submarine cable trench ditching equipment, and calculating to obtain the seawater suspended sediment source strength generated by laying the submarine cable in real time; according to the method, the turbidity meter is only fixed on the submarine cable trench ditching equipment, the submarine cable trench ditching equipment drives the turbidity meter to move in real time, and the real-time monitoring of the suspended sediment turbidity of the seawater near the submarine cable trench in the submarine cable trench ditching process can be realized, so that the real-time monitoring of the turbidity is facilitated, the suspended sediment source strength generated by laying the submarine cable can be calculated through the monitoring result and theoretical analysis, the difficulty that the traditional sampling mode is not easy to operate due to the fact that the sea cable is high in laying speed, high in ocean current flow rate, not easy to position the position of the submarine cable trench and the like is overcome, and therefore the method is simple to operate, convenient to implement and small in investment, can solve the problem that the suspended sediment source strength is difficult to determine in laying the submarine cable in the offshore wind power project, and has important significance for researching the environmental influence actually generated by the excavation operation and construction activities of the submarine cable trench in the offshore engineering.
The invention adopts the turbidity meter to monitor the turbidity of the suspended sediment of the seawater, obtains the relation between the turbidity of the suspended sediment of the seawater and the concentration of the suspended sediment through calibration experiments, converts the turbidity of the suspended sediment into the concentration of the suspended sediment, has simple mechanism and convenient monitoring, and provides field measured data for the environmental influence actually generated by the ditching operation construction.
The method can be suitable for various water areas needing to determine the strength of the suspended sediment source generated by ditching, and the calculation result can be analogized to be used for determining the strength of the suspended sediment source of similar engineering.
Drawings
FIG. 1 is a perspective view of a water jet type buried plow according to the present invention.
The reference numbers in the figures illustrate: 1. a ski board, 2, a ditching knife.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative, and not restrictive, of the invention.
A method for calculating the strength of a seawater suspended sediment source generated by laying a submarine cable comprises the following steps:
s1, as shown in figure 1, fixing a turbidity meter on a ski board 1 of the hydraulic jet type embedded plough through a bracket, wherein the turbidity meter is close to a ditching cutter 2 of the hydraulic jet type embedded plough, so that a detection electrode of the turbidity meter is close to the position of a submarine cable trench, and the turbidity meter monitors the suspended sediment turbidity of seawater near the submarine cable trench in real time after the submarine cable is laid, wherein the hydraulic jet type embedded plough is a traction type high-pressure water jet embedded plough;
s2, obtaining a relation between the turbidity of the suspended sediment and the concentration of the suspended sediment by performing calibration experiments on the turbidity of the suspended sediment and the concentration of the suspended sediment of the seawater;
s3, inputting the calibrated relation between the suspended sediment turbidity and the suspended sediment concentration of the seawater into a data processing system of a turbidity meter, and automatically calculating by the data processing system of the turbidity meter according to the suspended sediment turbidity of the seawater near the submarine cable trench monitored in real time to obtain the real-time suspended sediment concentration of the seawater; or, manually calculating to obtain the real-time suspended sediment concentration of the seawater according to the calibrated relation between the suspended sediment turbidity of the seawater and the suspended sediment concentration;
and S4, multiplying the real-time concentration of the suspended sediment by the jet flow of the hydraulic jet type embedded plough, and calculating to obtain the seawater suspended sediment source strength generated by laying the real-time submarine cable.
In step S2, among others: the calibration experiment comprises two modes of on-site calibration and indoor calibration.
In a first embodiment, the field calibration mode is selected in step S2, specifically, a plurality of turbidity data of suspended sediment of seawater monitored by a turbidity meter in the field are respectively corresponding to the suspended sediment concentration of a corresponding water sample synchronously collected by the same water layer, and then the turbidity of suspended sediment of seawater is calibrated to obtain a relation between the turbidity of suspended sediment of seawater and the concentration of suspended sediment; in step S3, the turbidity meter is taken down after the laying of the submarine cable is finished, the calibrated relation between the suspended sediment turbidity of the seawater and the suspended sediment concentration is input into the data processing system of the turbidity meter, and the real-time suspended sediment concentration of the seawater is automatically calculated by the data processing system of the turbidity meter according to the real-time monitored suspended sediment turbidity of the seawater near the submarine cable trench; or, according to the relation between the turbidity of the suspended sediment of the seawater and the concentration of the suspended sediment, which is obtained by calibration, the real-time concentration of the suspended sediment of the seawater is obtained through manual calculation.
In a second embodiment, one of the indoor calibration manners is selected in step S2, specifically, a certain amount of clear water is placed in the calibration tank, then the collected bottom silt of the sea area where the submarine cable is laid is placed into the clear water in the calibration tank for multiple times, and is continuously stirred, the turbidity of the suspended sediment after being uniformly mixed is measured by the turbidity meter after each time of placing the bottom silt of the sea area, 600mL of water sample near the turbidity meter in the calibration tank is taken, the concentration of the suspended sediment is calculated by a weighing method, and the same operation is performed for several times along with the increase of the turbidity of the suspended sediment, so that the relational expression between the turbidity of the suspended sediment and the concentration of the suspended sediment of the seawater is obtained.
In the third embodiment, another indoor calibration mode is selected in step S2, where the indoor calibration specifically includes placing all collected bottom silt in the sea area where the submarine cable is laid in a calibration tank, adding clean water into the calibration tank for multiple times, continuously stirring, measuring the turbidity of suspended sediment after uniform mixing by using a turbidity meter after adding clean water once, taking 600mL of water sample near the turbidity meter in the calibration tank at the moment, calculating the concentration of suspended sediment by using a weighing method, and performing the same operation for multiple times as the turbidity of suspended sediment decreases, thereby obtaining the relational expression between the turbidity of suspended sediment and the concentration of suspended sediment of seawater.
The water depth of the sea area where the general offshore wind power project is located exceeds 10m, the pressure intensity of the sea bottom is large, the turbidity of the submarine cable ditch accessory after the burying machine passes through is large, therefore, the selected turbidity meter needs to have a sufficient range and can resist high pressure, the turbidity meter is the AQUAlogger310TY model, the turbidity meter adopts an optical backscattering sensor, the measuring range is larger than 10000FTU, the pressure resistance is larger than 1000m, and the turbidity measurement during the laying of the submarine cables of the offshore wind power project of all sea areas can be met.
In the invention, a detection electrode of the turbidity meter needs to be close to the position of a cable trench as much as possible, and simultaneously, the detection electrode of the turbidity meter needs to be protected and fixed, the turbidity meter needs to be installed and fixed on a ski board 1 of the hydraulic jet type embedded plough, wherein the ski board 1 is tightly attached to the surface of a sea bed to move forwards, the turbidity meter is arranged beside a ditching knife 2 of the hydraulic jet type embedded plough, a support is arranged outside the turbidity meter for protection, and the turbidity meter can be taken out from the support at any time.
The principle of the invention is as follows: the strength of the suspended sediment source refers to the mass kg/s of the suspended sediment generated in unit time and is determined by the concentration kg/m of the suspended sediment3Multiplication by flow m3The method comprises the following steps of obtaining the concentration of suspended sediment near the hydraulic jet type embedded plough through a calibration experiment, and monitoring the concentration of the suspended sediment near the hydraulic jet type embedded plough in real time by utilizing a turbidity meter.
In conclusion, the method is simple to operate and convenient to implement, the concentration of suspended sediment in the sea cable trench can be monitored in real time only by fixing the turbidity meter on the hydraulic jet type ski board 1 for embedding the plough, the suspended sediment source intensity generated by laying the sea cable can be obtained through calculation, the problem that the suspended sediment source intensity is difficult to determine in laying the sea cable in the offshore wind power project can be solved, and the method has important significance for researching the environmental influence actually generated by the construction activities of sea engineering sea cable trench excavation operation.
The above are only preferred embodiments of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for calculating the strength of a seawater suspended sediment source generated by laying a submarine cable is characterized by comprising the following steps:
s1, fixing the turbidity meter on the submarine cable trench ditching equipment, and monitoring the suspended sediment turbidity of the seawater near the submarine cable trench in real time by the turbidity meter after the submarine cable is laid;
s2, obtaining the real-time suspended sediment concentration of the seawater according to the relation between the suspended sediment turbidity of the seawater and the suspended sediment concentration;
and S3, multiplying the real-time concentration of the suspended sediment by the jet flow of the submarine cable trench ditching equipment, and calculating to obtain the seawater suspended sediment source strength generated by laying the submarine cable in real time.
2. The method for calculating the strength of the seawater suspended sediment generated by laying the submarine cable according to claim 1, wherein in step S1: the submarine cable trench ditching equipment is a hydraulic jet type embedded plough, a turbidity meter is fixed on a ski board (1) of the hydraulic jet type embedded plough through a bracket, and the turbidity meter is close to a ditching knife (2) of the hydraulic jet type embedded plough.
3. The method for calculating the strength of the seawater suspended sediment produced by the laying of the submarine cable according to claim 1, wherein in step S2: through carrying out the calibration experiment of the suspended sediment turbidity and the suspended sediment concentration of the seawater, the relational expression of the suspended sediment turbidity and the suspended sediment concentration of the seawater is obtained.
4. The method for calculating the strength of the seawater suspended sediment generated by laying the submarine cable according to claim 3, wherein in step S2: the calibration experiment comprises two modes of on-site calibration and indoor calibration.
5. The method for calculating the strength of the seawater suspended sediment produced by the laying of the submarine cable according to claim 4, wherein in step S2: the on-site calibration specifically includes that the seawater on-site monitoring of the turbidity meter is multiple, the suspended sediment turbidity data correspond to the suspended sediment concentration of the corresponding water sample synchronously collected by the same water layer respectively, and then the suspended sediment turbidity of the seawater is calibrated to obtain the relational expression of the suspended sediment turbidity and the suspended sediment concentration of the seawater.
6. The method for calculating the strength of the seawater suspended sediment produced by the laying of the submarine cable according to claim 4, wherein in step S2: indoor demarcation specifically is put a quantitative clear water in the calibration tank, later lay the sea area bed material silt of collection and put into the clear water in calibration tank many times, and constantly mix, measure the suspension silt turbidity of the water body behind the misce bene through the turbidity meter after putting the sea area bed material silt once, and take near the next quantitative water sample of turbidity meter in the calibration tank this moment, calculate suspension silt concentration with weighing method, along with the increase of water suspension silt turbidity, so carry out the same operation of several times, obtain the suspension silt turbidity of sea water and the relational expression of suspension silt concentration.
7. The method for calculating the strength of the seawater suspended sediment produced by laying the submarine cable according to claim 4, wherein in step S2: indoor demarcation specifically lays the submarine cable of department sea area bed material silt of gathering and all puts into the calibration tank, later to adding the clear water to calibration tank in many times, and constantly mix, measure the suspension silt turbidity of misce bene back water through the turbidity meter after every clear water that adds, and get near the near a quantitative water sample of turbidity meter in the calibration tank this moment, calculate suspension silt concentration with the weighing method, along with the reduction of water suspension silt turbidity, so carry out the same operation several times, obtain the suspension silt turbidity of sea water and the relational expression of suspension silt concentration.
8. The method for calculating the strength of the seawater sediment suspended in the laid sea cable according to claim 6 or 7, wherein in step S2: the volume of the taken water sample near the turbidity meter in the calibration tank is 500-600 mL.
9. The method for calculating the strength of the seawater suspended sediment generated by laying the submarine cable according to claim 3, wherein in step S2: obtaining the real-time suspended sediment concentration of the seawater according to the relational expression between the suspended sediment turbidity of the seawater and the suspended sediment concentration, specifically, inputting the obtained relational expression between the suspended sediment turbidity of the seawater and the suspended sediment concentration by calibration into a data processing system of a turbidity meter, and automatically calculating by the data processing system of the turbidity meter according to the suspended sediment turbidity of the seawater near the real-time monitoring submarine cable trench to obtain the real-time suspended sediment concentration of the seawater; or, according to the relation between the turbidity of the seawater suspended sediment and the concentration of the suspended sediment obtained by calibration, the real-time concentration of the suspended sediment in the seawater is obtained through manual calculation.
10. The method for calculating the strength of the seawater suspended sediment generated by laying the submarine cable according to claim 2, wherein in step S3: the jetting flow is provided by the high pressure water pump design flow of the hydraulic jetting type embedded plough.
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