1. A method for calculating the saturation of water traffic is characterized by comprising the following steps:

s1: carrying out flow observation for 72 hours on a certain section in the river channel through data acquisition equipment to obtain latest flow data, and transmitting the flow data to a computer terminal for analysis after the flow data is successfully obtained;

s2: according to the flow observation data, classifying the ships in different length intervals, and calculating the percentage of the quantity of the ships in the length interval in the total flow; thus determining the length of the standard captain;

s3: determining the width of a channel according to the flow observation data;

s4: analyzing and calculating the average speed of the ship in the section of river channel according to the flow observation data;

s5: analyzing and calculating the theoretical static passing capacity of the section of the river channel according to the flow observation data;

s6: calculating the dynamic passing capacity of the river channel;

s7: analyzing to obtain the average ship passing flow according to the flow observation data;

s8: and calculating to obtain the dynamic saturation amount of the channel at the position.

2. The method for calculating the saturation of water traffic according to claim 1, wherein the channel width in S3 is a width of a one-way channel, and the channel width is calculated according to the following formula: l ═ L₁-l₂) /2, wherein l₁The width of the river channel; l₂The width of the isolation belt in the river channel.

3. The method for calculating water traffic saturation according to claim 1, wherein the average speed calculation formula in S4 is: l ═ V₃T, wherein l₃For vesselsDistance traveled in the river course over a period of time; t is the time it takes for the vessel to move that distance.

4. The method for calculating the saturation of water traffic according to claim 1, wherein the theoretical static passing capacity in S5 is the maximum traffic volume of the river channel passing through in unit time under ideal conditions, and the theoretical static passing capacity is calculated as C_b＝L·ρ_maxV, where L is the channel width, ρ_maxIs the maximum theoretical value of density of a ship on a channel of a certain width, i.e./Km²,ρ_maxThe size and shape of the ship can be determined according to the size, shape, arrangement sequence and other factors.

5. The method for calculating the saturation of water traffic according to claim 1, wherein the dynamic passing capacity in S6 is the maximum passing capacity per unit time of each channel under the actual channel traffic condition, and considering factors such as loss of speed, increase of resistance, and depth of water in the channel, the dynamic passing capacity calculation formula is: c_a＝C_b·σ₁·σ₂·σ₃Where σ is₁The loss factor of the navigational speed caused by the situations of ship intersection or pursuit and the like; sigma₂A reduction factor of passing ability caused by an increase in resistance of the vessel to travel when the density of the flow of the vessel increases; sigma₃For the influence factor of the water depth change of the channel caused by the tidal change, the specific values are found in relevant specification manuals.

6. The method for calculating the saturation of water traffic according to claim 1, wherein the average ship passing flow in S7 is the number of ships passing through the channel in unit time, and the calculation formula of the passing flow is as follows: k ═ X/T, where X is the number of vessels passing through the river during the time period; t is the time taken for a number X of vessels to pass through the river.

7. The method for calculating the saturation amount of water traffic according to claim 1The method is characterized in that the calculation formula of the dynamic saturation amount of the channel in the S8 is as follows: w_a＝K/C_a。

8. The method for calculating water traffic saturation according to claim 4, wherein the σ is₁The ship sails in a bidirectional channel, when the ship encounters or sails in the same direction during opposite sailing, the backward ship overtakes the forward ship, and the deceleration sailing is performed to avoid accidents such as collision and reduce the influence caused by ship fluctuation; sigma₂The sailing speed of the ship is limited due to the fact that the density of the ship in the channel is high, the ship cannot sail at a high speed, and the passing capacity of the ship is reduced; sigma₃The water depth of the channel is changed due to tidal change, so that some large-tonnage ships cannot sail at a low water level due to the limitation of the water depth, and the passing capacity of the channel is reduced at the moment.

9. The method for calculating the saturation of water traffic according to claim 1, wherein the data acquisition device in S1 includes: unmanned aerial vehicle and panorama camera.

Background

Shipping (Shipping) refers to transporting people or goods by water transport, air transport, and the like. Generally, the time required for water transportation is long, but the cost is low, which is not comparable to air transportation and land transportation. Water transport can carry a large amount of cargo per voyage, while air and land transport can carry a relatively small amount of cargo per voyage. Therefore, in international trade, water transportation is a common transportation method. In order to keep the sustainable and stable development of ports and ensure that ships can safely and smoothly navigate in the channels, the current situations of channel passing capacity and channel saturation are needed to be analyzed and evaluated to make scientific argumentation so that the matched channels can adapt to the development requirements of all ports and carry out planned reasonable development and comprehensive planning on the channels. One of the important indexes reflecting the service level of the channel when the channel saturation degree is measured, and the fun saturation degree can be understood as: the ratio of the actual ship flow passing through the channel to the channel passing capacity is ensured on the premise of ensuring the safe operation of the channel.

In the existing method for calculating the channel saturation, the channel passing capacity is mostly the maximum traffic volume of the channel in unit time under the natural condition and the ideal state of good ship traffic condition, so that the calculated channel saturation is also in the ideal state and has deviation from the actual condition.

Disclosure of Invention

The invention aims to overcome the defect that in the prior art, most of the channel passing capacity in the conventional channel saturation calculation method is the maximum traffic volume of a channel in a unit time under natural conditions and a relatively ideal state of good ship traffic conditions, so that the calculated channel saturation is deviated from the actual condition under the relatively ideal state, and the method for calculating the water traffic saturation is provided.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for calculating the saturation of water traffic comprises the following steps:

s1: carrying out flow observation for 72 hours on a certain section in the river channel through data acquisition equipment to obtain latest flow data, and transmitting the flow data to a computer terminal for analysis after the flow data is successfully obtained;

s2: according to the flow observation data, classifying the ships in different length intervals, and calculating the percentage of the quantity of the ships in the length interval in the total flow; thus determining the length of the standard captain;

s3: determining the width of a channel according to the flow observation data;

s4: analyzing and calculating the average speed of the ship in the section of river channel according to the flow observation data;

s5: analyzing and calculating the theoretical static passing capacity of the section of the river channel according to the flow observation data;

s6: calculating the dynamic passing capacity of the river channel;

s7: analyzing to obtain the average ship passing flow according to the flow observation data;

s8: and calculating to obtain the dynamic saturation amount of the channel at the position.

Preferably, the channel width in S3 is the width of the unidirectional channel, and the channel width calculation formula is as follows: l ═ L₁-l₂) /2, wherein l₁The width of the river channel; l₂The width of the isolation belt in the river channel.

Preferably, the average speed calculation formula in S4 is: l ═ V₃T, wherein l₃The distance the ship travels over the river for a period of time; t is the time it takes for the vessel to move that distance.

Preferably, the theoretical static passing capacity in S5 refers to the maximum traffic volume of the river channel passing in unit time under ideal conditions, and the calculation formula of the theoretical static passing capacity is C_b＝L·ρ_maxV, where L is the channel width, ρ_maxIs the maximum theoretical value of density of a ship on a channel of a certain width, i.e./Km²,ρ_maxThe size and shape of the ship can be determined according to the size, shape, arrangement sequence and other factors.

Preferably, the dynamic passing capacity in S6 is the maximum passing traffic volume that can pass through in each channel per unit time under actual channel traffic conditions, and considering factors such as speed loss, resistance increase, and channel water depth, the dynamic passing capacity calculation formula is:C_a＝C_b·σ₁·σ₂·σ₃where σ is₁The loss factor of the navigational speed caused by the situations of ship intersection or pursuit and the like; sigma₂A reduction factor of passing ability caused by an increase in resistance of the vessel to travel when the density of the flow of the vessel increases; sigma₃For the influence factor of the water depth change of the channel caused by the tidal change, the specific values are found in relevant specification manuals.

Preferably, the average ship passing flow in S7 is the number of ships passing through the channel in unit time, and the flow calculation formula is: k ═ X/T, where X is the number of vessels passing through the river during the time period; t is the time taken for a number X of vessels to pass through the river.

Preferably, the calculation formula of the dynamic saturation amount of the channel in S8 is as follows: w_a＝K/C_a。

Preferably, said σ is₁The ship sails in a bidirectional channel, when the ship encounters or sails in the same direction during opposite sailing, the backward ship overtakes the forward ship, and the deceleration sailing is performed to avoid accidents such as collision and reduce the influence caused by ship fluctuation; sigma₂The sailing speed of the ship is limited due to the fact that the density of the ship in the channel is high, the ship cannot sail at a high speed, and the passing capacity of the ship is reduced; sigma₃The water depth of the channel is changed due to tidal change, so that some large-tonnage ships cannot sail at a low water level due to the limitation of the water depth, and the passing capacity of the channel is reduced at the moment.

Preferably, the data acquisition device in S1 includes: unmanned aerial vehicle and panorama camera.

Compared with the prior art, the invention has the beneficial effects that:

the algorithm calculates through dynamic throughput capacity, sigma₁Because the ship is in the two-way channel, the ship encounters when going opposite or goes in the same direction, the backward ship overtakes the forward ship, and the speed is reduced to avoid the accidents such as collision and the like and reduce the influence caused by ship fluctuationFactors that cause speed loss for sailing; sigma₂The degree of freedom of the ship in sailing is limited due to the fact that the density of the ships in the channel is large, the ship cannot sail at a high speed, and the passing capacity of the ship is reduced by a factor; sigma₃The method is characterized in that the water depth of a channel is changed due to tidal change, so that some large-tonnage ships are limited by the water depth and are difficult to sail at a low water level, the passing capacity of the channel is reduced by a factor, and the dynamic passing capacity is reduced compared with the existing ideal passing capacity during calculation by selecting three main influence factors and is more consistent with the actual situation, so that the accuracy of the algorithm is higher.

Drawings

Fig. 1 is a schematic flow chart of a method for calculating saturation of water traffic according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1, a method for calculating a saturation of water traffic includes the following steps:

s1: carrying out flow observation for 72 hours on a certain section in the river channel through data acquisition equipment to obtain latest flow data, and transmitting the flow data to a computer terminal for analysis after the flow data is successfully obtained;

s2: according to the flow observation data, classifying the ships in different length intervals, and calculating the percentage of the quantity of the ships in the length interval in the total flow; thus determining the length of the standard captain;

s3: determining the width of a channel according to the flow observation data;

s4: analyzing and calculating the average speed of the ship in the section of river channel according to the flow observation data;

s5: analyzing and calculating the theoretical static passing capacity of the section of the river channel according to the flow observation data;

s6: calculating the dynamic passing capacity of the river channel;

s7: analyzing to obtain the average ship passing flow according to the flow observation data;

s8: and calculating to obtain the dynamic saturation amount of the channel at the position.

The channel width in S3 refers to the width of the one-way channel, and the calculation formula of the channel width is as follows: l ═ L₁-l₂) /2, wherein l₁The width of the river channel; l₂The width of the isolation belt in the river channel.

The average speed calculation formula in S4 is: l ═ V₃T, wherein l₃The distance the ship travels over the river for a period of time; t is the time it takes for the vessel to move that distance.

The theoretical static passing capacity in S5 refers to the maximum traffic volume of the river channel passing in unit time under ideal conditions, and the calculation formula of the theoretical static passing capacity is C_b＝L·ρ_maxV, where L is the channel width, ρ_maxIs the maximum theoretical value of density of a ship on a channel of a certain width, i.e./Km²,ρ_maxThe size and shape of the ship can be determined according to the size, shape, arrangement sequence and other factors.

The dynamic passing capacity in the step S6 is the maximum passing capacity of each channel in unit time under the actual channel traffic condition, and the dynamic passing capacity calculation formula is given by considering factors such as speed loss, resistance increase, channel water depth and the like: c_a＝C_b·σ₁·σ₂·σ₃Where σ is₁The loss factor of the navigational speed caused by the situations of ship intersection or pursuit and the like; sigma₂A reduction factor of passing ability caused by an increase in resistance of the vessel to travel when the density of the flow of the vessel increases; sigma₃For the influence factor of the water depth change of the channel caused by the tidal change, the specific values are found in relevant specification manuals.

The average ship passing flow in the S7 refers to the number of ships passing through the channel in unit time, and the calculation formula of the flow is as follows: k ═ X/T, where X is the number of vessels passing through the river during the time period; t is the time taken for a number X of vessels to pass through the river.

The calculation formula of the dynamic saturation amount of the channel in S8 is as follows: w_a＝K/C_a。

σ₁The ship sails in a bidirectional channel, when the ship encounters or sails in the same direction during opposite sailing, the backward ship overtakes the forward ship, and the deceleration sailing is performed to avoid accidents such as collision and reduce the influence caused by ship fluctuation; sigma₂The sailing speed of the ship is limited due to the fact that the density of the ship in the channel is high, the ship cannot sail at a high speed, and the passing capacity of the ship is reduced; sigma₃The water depth of the channel is changed due to tidal change, so that some large-tonnage ships cannot sail at low water level due to the limitation of the water depth, and the passing capacity of the channel is reduced at the moment

The data acquisition device in S1 includes: unmanned aerial vehicle and panorama camera.

In the invention, the algorithm calculates through dynamic passing capability, a₁The ship is in a two-way channel, and a rear ship overtakes a front ship when the ship encounters meeting or navigates in the same direction during opposite navigation, so that the factors of speed loss caused by deceleration navigation in order to avoid accidents such as collision and reduce the influence caused by ship fluctuation are avoided; a is₂The degree of freedom of the ship in sailing is limited due to the fact that the density of the ships in the channel is large, the ship cannot sail at a high speed, and the passing capacity of the ship is reduced by a factor; a is₃The method is characterized in that the water depth of a channel is changed due to tidal change, so that some large-tonnage ships are limited by the water depth and are difficult to sail at a low water level, the passing capacity of the channel is reduced by a factor, and the dynamic passing capacity is reduced compared with the existing ideal passing capacity during calculation by selecting three main influence factors and is more consistent with the actual situation, so that the accuracy of the algorithm is improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.