Dredging method for river channel or fixed water area

Abstract

A river channel or fixed water area dredging method comprises the steps that firstly, data of a water area needing to be dredged are obtained, and a dredging scheme is determined according to the obtained data; 2, according to the desilting scheme, a desilting route is set; and 3, by taking day as a unit, the dredging time of each day is formulated, dredging is conducted along the set dredging route, and dredging recording is conducted every day. According to the dredging method for the riverway or the fixed water area, the dredging scheme, dredging construction process control, sand dredger maintenance, dredging construction management and the like are considered in multiple aspects and multiple dimensions, efficient and smooth dredging of the riverway or the fixed water area is guaranteed, and the purpose of improving the dredging efficiency of the riverway or the fixed water area is achieved. The device is suitable for public rivers, flowing water areas or closed facilities such as horizontal flow grit chambers and the like, and has high popularization value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water area dredging methods in river or fixed water area, and more particularly, to a river or fixed water area dredging method. BACKGROUND

[0002] There are many rivers in China, and the production and living water in many areas is taken from nearby rivers, so it is necessary to investigate and monitor the bottom of the water taking river or the bottom of the water bearing pool.

[0003] The commonly used dredging equipment is a cutter suction dredger or a jet suction dredger, both of which have the problem of low working efficiency, but by formulating a dredging scheme, controlling the dredging construction process, maintaining the dredging ship and managing the dredging construction, the efficient dredging of the river or fixed water area can be ensured.

[0004] In the patent CN115094967A, a cutter suction dredger dredging construction method is disclosed, which mainly improves the working efficiency of the dredger from the perspective of positioning the steel column of the cutter suction dredger body, but based on this patent technology, the dredging efficiency of the river or fixed water area still needs to be further improved. SUMMARY

[0005] (I) Technical problem

[0006] Based on the above, how to provide a new method for dredging the river or fixed water area to improve the dredging efficiency has become a problem to be solved by those skilled in the art.

[0007] (II) Technical solution

[0008] In order to achieve the above purpose, the present application provides the following technical solution:

[0009] The present application provides a river or fixed water area dredging method, in which the river or fixed water area dredging method comprises:

[0010] Step 1, obtaining data of the water area to be dredged, and determining a dredging scheme according to the obtained data;

[0011] Step 2, setting a dredging route according to the dredging scheme;

[0012] Step 3, formulating the dredging time of each day in units of days, dredging along the set dredging route, and recording the dredging every day.

[0013] Preferably, in the river or fixed water area dredging method provided by the present application, in the step one, the data of the water area to be dredged comprises the water depth data of different positions of the water area to be dredged, the average water depth data of the water area to be dredged and the periodic sounding data of the bottom sediment of the water area to be dredged; if the water depth of the water area currently dredged is greater than the average water depth of the water area to be dredged, the dredging time is reduced or the travel speed of the dredging ship is increased; if the water depth of the water area currently dredged is less than the average water depth of the water area to be dredged, the dredging time is increased or the travel speed of the dredging ship is reduced.

[0014] Preferably, in the river or fixed water area dredging method provided by the present application, in the step one, the water depth of different positions of the water area to be dredged is measured by using a handheld measuring rod, and then the average value of the water depth of different points is taken to obtain the average water depth data; the periodic sounding of the bottom sediment of the water area to be dredged is carried out periodically every week or every month to obtain the periodic sounding data of the bottom sediment of the water area to be dredged.

[0015] Preferably, in the river or fixed water area dredging method provided by the present application, in the step two, the dredging route is: along the flow direction of the river, the water area to be dredged is divided into multiple water area units, and each water area unit is dredged from the downstream to the upstream.

[0016] Preferably, in the river or fixed water area dredging method provided by the present application, the S-shaped route is used to dredge each water area unit along the flow direction of the river.

[0017] Preferably, in the river or fixed water area dredging method provided by the present application, in the step three, the recording content of the dredging record includes: date, work content, opening time, closing time, running time, single unit oil consumption, total oil consumption, and person filling in the table.

[0018] Preferably, in the river or fixed water area dredging method provided by the present application, a flow meter is installed on the dredging ship, the flow meter is a flow meter with data recording function, and is used to generate the start time, stop time and flow value.

[0019] Preferably, in the river or fixed water area dredging method provided by the present application, a slurry concentration meter is installed on the dredging ship to obtain the real-time sludge discharge concentration; or a vacuum gauge is installed on the dredging ship to obtain the internal pressure data of the sludge discharge pump on the dredging ship.

[0020] Preferably, in the river or fixed water area dredging method provided by the present application, whether the current water area is completed is determined according to the internal pressure data obtained by the vacuum gauge and the real-time sludge discharge concentration data obtained by the slurry concentration meter.

[0021] Preferably, in the river or fixed water area dredging method provided by the present application, when the internal pressure data obtained by the vacuum gauge of the dredging ship is below 0.02 MPa, and the slurry concentration data obtained by the slurry concentration gauge is below 5%, the dredging ship is in the state of pumping clean water, and the current water area is completed, the dredging depth is adjusted or the dredging ship is moved forward in this state; when the internal pressure data obtained by the vacuum gauge of the dredging ship is between 0.04 MPa and 0.07 MPa, and the slurry concentration obtained by the slurry concentration gauge is between 15% and 30%, the dredging ship is in the normal dredging state and continues to dredge the current water area.

[0022] (Three) beneficial effects

[0023] As can be seen from the above, the present application provides a river or fixed water area dredging method, comprising: step one, obtaining data of the water area to be dredged, and determining the dredging scheme according to the obtained data; step two, setting the dredging route according to the dredging scheme; step three, formulating the dredging time of each day in units of days, dredging along the set dredging route, and recording the dredging every day. In the river or fixed water area dredging method provided by the present application, the present application considers from the dredging scheme, dredging construction process control, dredging ship maintenance and management of dredging construction, etc. in multiple aspects and multiple dimensions to ensure the efficient dredging of the river or fixed water area, so as to improve the dredging efficiency of the river or fixed water area. The present application is suitable for public rivers, flowing water areas or closed facilities, such as horizontal sand settling tanks, etc., and has strong popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and their explanations serve to explain the present application, and do not constitute improper limitations on the present application. Among them:

[0025] Figure 1 The water depth chart drawn according to the water depth data of different positions of the dredging water area in the embodiment of the present application;

[0026] Figure 2 The navigation route map of the dredging ship in the river or fixed water area dredging method in the embodiment of the present application.

[0027] In Figure 2 , A area is the water area unit to which dredging work is first performed, B area is the water area unit to which dredging work is performed after A area is completed, and C area is the water area unit to which dredging work is performed after B area is completed. DETAILED DESCRIPTION

[0028] The present application will be described in detail below with reference to the drawings and in conjunction with embodiments. Various examples are provided by way of explanation of the present application, but not to limit the present application. It will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the present application. For example, features shown or described as part of one embodiment can be used in another embodiment to create yet another embodiment. Therefore, it is intended that the present application include such modifications and variations as fall within the scope of the appended claims and their equivalents.

[0029] In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and do not require the present application to be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. The terms "connected", "connected" used in the present application should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be directly connected, or indirectly connected through intermediate components, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0030] Please refer to Figure 1 and Figure 2 , wherein, Figure 1 is a water depth chart drawn according to water depth data of different positions of the dredged water area in the embodiments of the present application; Figure 2 is a navigation route map of the dredging ship in the river channel or fixed water area dredging method in the embodiments of the present application.

[0031] The present application provides a river channel or fixed water area dredging method, which comprises the following steps:

[0032] Step one, obtain the data of the water area (which can be a flowing water area or a fixed water area) that needs to be dredged, and determine the dredging scheme according to the obtained data.

[0033] In step one, the data obtained for the area to be dredged includes: water depth data at different locations within the dredged area (the denser the data collection points, the more accurate the data; generally, 5-10 collection points are set per 100 square meters, but this can be adjusted according to specific circumstances), the average water depth data of the dredged area, and periodic depth measurements of the sediment at the bottom of the dredged area. After obtaining the average water depth data, those skilled in the art can determine the dredging vessel's speed during operation (using this speed as the standard speed) based on experience, the dredging vessel's dredging capacity, and other factors. If the current water depth is greater than the average water depth, the dredging time is reduced or the dredging vessel's speed is increased (relative to the standard speed). If the current water depth is less than the average water depth, the dredging time is increased or the dredging vessel's speed is decreased (relative to the standard speed).

[0034] Furthermore, in step one, the acquisition of water depth or bottom sediment depth data is achieved using a handheld measuring rod. Technicians use the rod to measure the water depth at different locations within the dredged area, obtaining the water depth at each point, and then averaging these measurements to obtain the average water depth data. The bottom sediment depth of the dredged area is measured regularly on a weekly or monthly basis to obtain periodic depth data.

[0035] Step 2: Set up the dredging route according to the dredging plan.

[0036] In step two, the dredging route is as follows: along the river's flow, the water area to be dredged is divided into multiple water segments, and dredging is carried out on each water segment from downstream to upstream. Specifically, an S-shaped route is used to dredge each water segment along the river's flow.

[0037] Step 3: Establish a daily dredging schedule, carry out dredging along the designated dredging route, and record the dredging progress daily.

[0038] In step three, the daily dredging record includes: date, work content, start-up and shutdown times, operating duration, fuel consumption of individual units, total fuel consumption, and the person filling out the form. Specifically, a flow meter with built-in data recording function is installed on the dredging vessel to generate start-up time, shutdown time, and flow rate values. Specifically, a mud concentration meter is installed on the dredging vessel to obtain real-time mud discharge concentration; or a vacuum gauge is installed on the dredging vessel to obtain the internal pressure data of the mud discharge pump. Specifically, the completion of the dredging work in the current water area is confirmed based on the internal pressure data obtained from the vacuum gauge and the real-time mud discharge concentration data obtained from the mud concentration meter.

[0039] In one specific embodiment of the present application, when the internal pressure data obtained by the vacuum gauge of the dredging vessel is below 0.02 MPa, and the slurry concentration data obtained by the slurry concentration gauge is below 5%, the dredging vessel is in a clear water state, and the dredging work of the current water area has been completed, the dredging depth is adjusted or the dredging vessel is moved forward in this state; when the internal pressure data obtained by the vacuum gauge of the dredging vessel is between 0.04 MPa and 0.07 MPa, and the slurry concentration obtained by the slurry concentration gauge is between 15% and 30%, the dredging vessel is in a normal dredging state and continues to dredge the current water area.

[0040] The present application provides a river or fixed water area dredging method, which considers from the aspects of dredging scheme, dredging construction process control, dredging vessel maintenance and management of dredging construction, to ensure the efficient dredging of the river or fixed water area, so as to improve the dredging efficiency of the river or fixed water area.

[0041] The method provided by the present application is as follows:

[0042] I. Design of dredging scheme

[0043] 1. First, understand the situation of the dredging water area, including the water depth of different positions of the dredging water area and the average water depth of the water area, periodic sounding data of the bottom sediment of the water area, etc.

[0044] The specific operation is: using a handheld measuring rod to measure the water depth at different positions of the river basin, obtaining the water depth of different points of the basin, and then taking the average value to obtain more accurate river basin water depth data parameters, which is also applicable to fixed flowing water areas; periodically, every week or every month, the bottom sediment sounding is carried out, and the dredging situation of the week or month can be known by combining the data drawing, which is convenient for the deployment of the next dredging work.

[0045] 2. Master the flow change of the dredging river and dredging facilities every day, and combine the water level situation to dredge from the downstream to the upstream direction under the premise of ensuring the safety of the dredging vessel, first dredge the downstream range, and dredge in the east-west direction (as shown in Figure 2 , which can be specifically understood as being along the flow direction, for example, dredging every 1000 meters along the flow direction, and dividing along the river width according to the width of the dredging facility, the dredging facility first dredges along the flow direction from one side of the river, then moves one unit along the river width and then dredges along the flow direction for the second time, forming an S-shaped dredging route), and records the dredging depth and range every day, and gradually advances to the upstream.

[0046] 3. Daily dredging time is made, the dredging ship is checked and maintained before sailing and after stopping, and the operation record is filled after stopping every day. The operation record includes date, work content, opening time, closing time, operation time, single unit oil consumption, total oil consumption, and the person filling the table. In one embodiment of the application, the dredging time is as follows: 8:00-11:30 am, and 13:30-17:00 pm. As long as the construction operation is carried out, the above time is carried out every day. The application does not have specific requirements for weeks, months and years.

[0047] II. Design of process control.

[0048] 1. A flow meter is installed on the ship body. The flow meter used in the application selects a flow meter with data recording function, i.e. the flow meter can display and record the start time, stop time and flow value. In the flow meter embodiment with data recording function, the daily opening and stopping time is based on the change of the flow meter of each ship. Because the flow meter has the function of displaying and recording the start time, stop time and flow value, if a flow meter with display function is installed, the ship body opening and stopping time can be combined with the flow meter change to prevent false reporting.

[0049] 2. A dredging ship maintenance responsibility system is established. For dredging ships with high maintenance rate and frequent spare part damage, periodic maintenance inspection and repair is carried out.

[0050] 3. During dredging, management personnel can consider all-day duty on Saturday and Sunday, and electricians and inspection, maintenance personnel implement two-line duty on Saturday and Sunday. If there is maintenance, it can be arranged and handled at any time to ensure that the dredging work is not affected.

[0051] 4. The dredging situation of the dredged river channel or facility is checked every month (the checking content includes whether the dredged river channel or facility is unobstructed; appearance comparison with the non-dredged area, etc.), the river channel or facility is measured, the measurement results are well recorded, and the results are fed back to the dredging personnel in time.

[0052] 5. By installing a flow meter on the dredging vessel's discharge pipe and uploading the flow meter reading to a network platform, the dredging volume can be viewed at any time via mobile phone or computer. The dredging concentration can be determined using the sludge concentration meter on board. Higher sludge concentrations result in a lower flow rate compared to clear water. Therefore, during actual dredging, changes in flow rate can be used to determine whether the dredging area has been cleared, further improving dredging efficiency and reducing water loss. In this invention, both the flow meter and the sludge concentration meter can be used to determine whether the work area has been cleared. Generally, data from both devices are needed to determine completion. However, if the data is inconsistent, the sludge concentration meter reading should be prioritized. For example, the flow rate count may be lower, and conversely, after dredging a certain area, the sludge concentration value will be lower, while the flow rate count will be higher. The sludge concentration meter reading is the primary indicator. If the two meters are inconsistent or a single meter reading is insufficient, the color and turbidity of the sludge discharged from the dredging vessel's discharge pipe can also be observed to determine completion.

[0053] 6. Utilize the changing values ​​of the vacuum gauge and mud concentration meter to determine the dredging status of the dredging vessel and improve dredging efficiency. Changes in the vacuum gauge value represent changes in pressure within the sludge pump, while the mud concentration meter displays the real-time mud concentration pumped from the cutterhead area. Changes in the vacuum gauge value and mud concentration indicate the dredging vessel's working status and dredging effectiveness. Generally, when the vacuum gauge reading is below 0.02 MPa and the mud concentration meter shows a concentration below 5%, the dredging vessel is pumping clean water. When the vacuum gauge reading is between 0.04 MPa and 0.07 MPa and the mud concentration meter reading is between 15% and 30%, the dredging vessel is in normal dredging operation. During dredging, when the mud concentration meter reading drops to 5%, it indicates that the accumulated mud at that depth has been largely removed, and the dredging depth can be adjusted or the vessel can be moved forward.

[0054] III. Design of maintenance and upkeep plans.

[0055] 1. At the beginning and end of the construction, perform oil changes and maintenance on the diesel engine, sand pump, clutch and other mechanical equipment of the dredging vessel in accordance with the mechanical equipment maintenance manual.

[0056] 2. At the beginning and end of construction, check all pipelines for leaks, disconnections, etc., to ensure that the pipeline connections are correct and unobstructed.

[0057] 3. Check the status of all batteries and perform charging maintenance.

[0058] 4. Check all power switches and wiring to ensure normal power supply.

[0059] 5. During dredging, regularly replenish lubricating oil to the moving parts of the equipment to ensure normal operation.

[0060] 6. After the construction is completed, the whole ship is maintained.

[0061] 7. When dredging in the north, the dredging ship should be properly arranged before the river is closed to prevent natural conditions such as ice flood and extreme weather from causing damage to the ship body and various facilities inside the ship and affecting normal use next year.

[0062] Four, the design of dredging management.

[0063] If the dredging water area is wide and the required dredging ship is more, each dredging ship can be linked to a responsible person, and the responsible person is responsible for measuring the dredging data. In order to more effectively carry out dredging work, the dredging area responsible by each dredging ship can be evaluated by water level and depth, and the dredging evaluation is divided into grades for reward. If it is a fixed water area, the minimum average depth of each pool can be used as the minimum grade reward standard, and three reward grades are set. The grade reward is evaluated according to the average dredging depth completion of the month. For the monthly measurement results, if the corresponding reward grade dredging depth requirement of each month is reached, the reward is given according to the corresponding grade of the dredging depth; for the ship that does not reach the minimum dredging requirement of each month, the examination will be given; if the minimum average depth requirement is completed in the final acceptance, the previous examination will be refunded; if the minimum average depth requirement is not completed in the final acceptance, the corresponding examination will be given.

[0064] The beneficial effects that can be obtained after the implementation of the present application are summarized as follows: the combination of the methods of formulating the dredging scheme, the construction process control of dredging, the maintenance of the dredging ship and the management of the dredging construction ensures the efficient and smooth dredging of the river or fixed water area.

[0065] One specific embodiment of the present application: an ultrasonic flowmeter is installed on the dredging ship's discharge pipeline by inserting connection method. When the ultrasonic wave propagates in the moving fluid, it carries information about the fluid velocity. The received ultrasonic wave can detect the flow rate of the fluid. A transmitting probe is installed on one side of the pipe wall, and a signal is transmitted by the transmitting probe. A receiving probe is installed on the other side of the pipe wall, and the data is displayed on the electronic screen after the signal is received by the receiving probe. This allows the workers operating the dredging ship to accurately view the current dredging position (the real-time position of the dredging ship is obtained by the GPS or Beidou device installed on the ship) and the discharge capacity during excavation operation from the display screen, which is convenient for subsequent operation.

[0066] In the actual operation process of the ship personnel, the relevant operation data is counted to determine the variation range of each basic data in the actual operation process and to determine the critical indicators. When the vacuum gauge of the dredging ship is below 0.02 MPa and the mud concentration meter shows a concentration of 5% or below, the dredging ship is in a clear water pumping state; when the vacuum gauge is between 0.04 MPa and 0.07 MPa and the mud concentration meter shows a concentration of 15%-30%, the dredging ship is in a normal dredging state; during dredging, when the mud concentration meter shows a concentration of 5%, it indicates that the accumulated mud at this depth has been basically excavated, and the excavation depth can be adjusted or the forward operation can be performed. At the same time, according to the abnormal change of the above-mentioned instrument values, the fault position and fault type can be accurately judged, so that the ship personnel can make corresponding adjustments in time to reduce the misoperation caused by experience judgment.

[0067] In terms of ship maintenance, the electric motor is provided with bearing grease injection and discharge devices. When needed, the oil injection bolts in front and behind the electric motor can be removed, and the grease can be injected by an oil gun. The grease is replaced once every six months according to the operation condition, or when the color of the grease is dark, water droplets or dust are accumulated on the grease, the grease is hardened and deteriorated, or the bearing is overheated, the grease is immediately replaced. When replacing the grease, the old grease is removed, the bearing and bearing cover are cleaned, and then the new grease is added. The amount of the added grease should be 2 / 3 of the capacity of the bearing chamber.

[0068] In Figure 1 , a dredging effect diagram is shown, which divides the dredging water area into six long and wide grids, i.e., for a certain water area, along the flow direction, from the upstream end to the downstream end, six horizontal division lines (1, 2, …, 6 points on Figure 1 ) are evenly arranged in the water area, forming five areas; along the width direction of the water area, from one side of the water area to the other side, six vertical division lines (the first grid, the second grid, …, the sixth grid point on Figure 1 ) are evenly arranged in the water area, forming five areas, so as to form 25 blocks. The intersection of the vertical and horizontal division lines can be measured, or the midpoint of each block can be measured. After obtaining the measurement data, a graphical report is drawn (the horizontal plane is the vertical and horizontal division line indicating plane, and the vertical plane is the water depth indicating plane), only from Figure 1The bottom silt distribution and water level after dredging are clearly visible. By taking bottom silt depth measurement in a weekly or monthly cycle, combined with data plotting, the weekly or monthly dredging condition can be known, facilitating the deployment of the next step of dredging work and ensuring the smooth and efficient operation of the dredging work. In addition, the present application can also use color to distinguish water depth when drawing graphical reports. For example, there are three colors, blue, orange and gray, in the graphical report, and the area below the color represents the silt layer and the area above represents the water layer. Blue represents that the water depth in the area is between -4.3 meters and -4.7 meters, orange represents that the water depth in the area is between -3.8 meters and -4.3 meters, and gray represents that the water depth in the area is between -3.3 meters and -3.8 meters. The graphical report can be used as a stage or final summary to represent the dredging stage results or final results, and can also provide an intuitive indication for the next stage of dredging. By comparing the drawn graphical report with the overall dredging requirement depth, the area that needs to be dredged in the next step can be deployed for operation.

[0069] The effective effects of the present application are as follows: 1. By collecting and arranging the operation data according to the concentration and flow change trend displayed by the instrument, combining with the operation condition of the dredging ship, the dredging method is standardized and formulated, the dredging efficiency is improved in the efficient concentration range, and the water loss is reduced; 2. By effectively combining the existing vacuum table and the concentration meter, the operation standard is clear, the corresponding operation procedure and standardized operation instruction book are formulated, the data is used to speak, the experiential judgment is eliminated, and the operation ability of the dredging ship personnel is improved; 3. By adjusting the personnel configuration, technical training and optimizing the dredging operation method, the management mode is changed from relying on experience to relying on data, a new reward and punishment mechanism is formulated, the dredging target is completed in the given time, the overtime is reduced, the labor intensity of the post personnel is reduced, and the management efficiency is improved.

[0070] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for dredging a river or fixed waterway, characterized in that, include: Step 1: Obtain data on the water area that needs to be dredged, and determine the dredging plan based on the obtained data; Step 2: Determine the dredging route according to the dredging plan; Step 3: Establish a daily dredging schedule, carry out dredging along the designated dredging route, and record the dredging activities daily.

2. The method for dredging a river or fixed waterway according to claim 1, characterized in that, In step one, the data to be obtained for the water area to be dredged includes: water depth data at different locations in the dredged water area, average water depth data of the dredged water area, and periodic depth measurement data of sediment at the bottom of the dredged water area. If the water depth of the area currently being dredged is greater than the average water depth of the dredging area, the dredging time will be reduced or the speed of the dredging vessel will be increased. If the water depth of the area currently being dredged is less than the average water depth of the dredging area, the dredging time will be increased or the speed of the dredging vessel will be reduced.

3. The method for dredging a river or fixed waterway according to claim 2, characterized in that, In step one, the water depth is measured at different locations of the water area to be dredged using a handheld measuring rod to obtain the water depth at different points, and then the average value is taken to obtain the average water depth data. The depth of sediment at the bottom of the dredged waterway is measured regularly on a weekly or monthly basis to obtain regular depth data of sediment at the bottom of the dredged waterway.

4. The method for dredging a river or fixed waterway according to claim 1, characterized in that, In step two, the dredging route is as follows: along the river flow, the water area to be dredged is divided into multiple water units, and dredging is carried out on each water unit from downstream to upstream.

5. The method for dredging a river or fixed waterway according to claim 4, characterized in that, The dredging of each water area was carried out using an S-shaped route along the river's flow.

6. The method for dredging a river or fixed waterway according to claim 1, characterized in that, In step three, the daily dredging record includes: date, work content, start-up time, stop-up time, running time, fuel consumption of individual units, total fuel consumption, and the person filling out the form.

7. The method for dredging a river or fixed waterway according to claim 6, characterized in that, A flow meter is installed on the dredging vessel. The flow meter has a built-in data recording function and is used to generate start-up time, shutdown time and flow value.

8. The method for dredging a river or fixed waterway according to claim 7, characterized in that, A mud concentration meter is installed on the dredging vessel to obtain the real-time mud concentration. Alternatively, a vacuum gauge can be installed on the dredging vessel to obtain the internal pressure data of the sludge pump on the dredging vessel.

9. The method for dredging a river or fixed waterway according to claim 8, characterized in that, The dredging work in the current water area is confirmed based on the internal pressure data obtained from the vacuum gauge and the real-time sludge concentration data obtained from the sludge concentration.

10. The method for dredging a river or fixed waterway according to claim 9, characterized in that, When the internal pressure data obtained by the vacuum gauge of the dredging vessel is below 0.02MPa and the mud concentration data obtained by the mud concentration meter is below 5%, the dredging vessel is in the state of pumping clean water. The dredging work in the current water area has been completed. In this state, the dredging depth can be adjusted or the dredging vessel can be moved forward. When the internal pressure data obtained by the vacuum gauge of the dredging vessel is between 0.04MPa and 0.07MPa, and the mud concentration obtained by the mud concentration meter is between 15% and 30%, the dredging vessel is in normal dredging status and continues to dredge the current water area.

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