CN110222444B - Calculation method for sediment accumulation body form during bottom throwing of trailing suction hopper dredger - Google Patents
Calculation method for sediment accumulation body form during bottom throwing of trailing suction hopper dredger Download PDFInfo
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Abstract
The invention discloses a calculation method of sediment accumulation body form during bottom throwing of a trailing suction hopper dredger, which comprises the following steps: (1) Collecting data of the trailing suction hopper dredger under the condition of a bottom throwing operation mode; (2) Establishing a sand throwing shape function according to the sand throwing amount and the water depth of a sand throwing point; (3) Establishing a particle size coefficient function according to the water depth of the sand throwing point and the particle size of the sediment; (4) And fitting the sand throwing shape function, the particle size coefficient function and the established physical model to obtain a stacking shape function. According to the invention, a physical model is built through collected historical data of the trailing suction hopper dredger under the condition of a bottom throwing operation mode, the relation formula of the underwater sediment accumulation body under the condition of the bottom throwing operation mode of the dredging dredger is summarized and fitted, and the form of the underwater sediment accumulation body is rapidly calculated according to the mud throwing amount, the mud throwing water depth and the sediment particle size of the bottom throwing operation of the dredging dredger, so that the operation mode of the dredging dredger is guided and optimized.
Description
Technical Field
The invention belongs to the technical field of real-time forecasting, and particularly relates to a method for rapidly calculating a sediment and sand accumulation integrated form of a bottom of a large-scale trailing suction hopper dredger.
Background
The development of the dredging industry in China has hundreds of years, under the promotion of global tide of economy and rapid development of international trade, ports are built, deep coastal channels are widened and dug in various places in China for adapting to the requirements of large-scale development of container and oil tanker transportation, so that navigation capacity is improved, and the dredging industry is rapidly developed. Meanwhile, along with the development of ports, channels, farmland water conservancy and coastal cities, the dredging operation field is also extended to a large extent, and the dredging operation field is sequentially expanded to the fields of farmland water conservancy and reservoir construction and maintenance, national defense engineering construction, environmental protection dredging, hydraulic reclamation and the like from the traditional port channel dredging and maintenance, river and lake management and water conservancy facility construction.
The drag suction dredger is a dredger which can dredge while walking, and all the works of dredging, loading and unloading mud are completed by the dredger. The dredging cabin-loading method for the trailing suction hopper dredges a channel, after the channel is full, the channel is driven to a dumping area, dredged soil in the cabin is dumped into water in the dumping area, and then the dredged soil returns to a digging groove, and the work of the previous round is repeated. After the dredging sediment is conveyed to a destination, the sediment is further treated according to the dredging purpose, sediment characteristics and availability, including hydraulic reclamation land area, beach maintenance, offshore disposal, land disposal, isolation disposal and the like. Dredging sediment disposal is the final stage of the dredging project, the disposal positions are different, and the influence on the environment is different: (1) If underwater treatment is adopted, the fine-particle sediment is diffused and moved to the periphery to different degrees under the action of hydrodynamic force; (2) If land treatment is adopted, such as hydraulic reclamation land area and beach maintenance, the main pollution mainly comes from residual water discharge and overflow in the mud-water separation process; (3) Furthermore, the onshore treatment of dredging sediment may have a negative impact on the quality of groundwater in the vicinity of the disposal site, if no corresponding protective measures are taken.
Along with the current environmental protection requirement, engineering design and other requirements, higher requirements are put forward on the fine construction process of dredging the underwater flatness of the sediment treatment of the ship or blowing, filling, slope releasing and the like. For example, the port city of the Scoop of the Sprinkac has slope releasing requirements on the water of the hydraulic reclamation area, and the three runway projects of the hong Kong airport have requirements on layered hydraulic reclamation. However, the research results on the form of the dredged and mud-thrown water body accumulation body are very few, the selection of the position of the ship mud-thrown operation mostly depends on experience, a certain blindness exists, and the support of related theory and research is urgently needed, so that the low-cost and fine development of the dredging mud-thrown hydraulic filling operation is advanced.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the invention provides a method for rapidly calculating the form of a large-scale drag suction dredger bottom sediment accumulation body, which can rapidly calculate the form characteristics of the sediment accumulation body through a fitted underwater sediment accumulation body relation, and guide and optimize the operation mode of the drag suction dredger.
The technical scheme is as follows: the invention relates to a calculation method of sediment accumulation body form during bottom throwing of a trailing suction hopper dredger, which comprises the following steps:
(1) CollectingThe data of the collection drag suction dredger under the condition of bottom throwing operation mode comprises the sand throwing quantity V and the unit is cm 3 The sediment grain diameter d is in mm, the sand throwing point water depth H is in cm, and the side slope, the height and the range of the stacking body are data, and a physical model is established;
(2) Establishing a sand throwing shape function according to the sand throwing amount and the water depth of a sand throwing point:
f(h，V)＝p1+p2*h+p3*h 2 +p4*C+p5*C 2 +p6*C 3 +p7*C 4 ；
where h=lg (H), c=lg (V), p1, p2, p3, p4, p5 and p6 are coefficients;
(3) Establishing a particle size coefficient function according to the water depth of the sand throwing point and the particle size of the sediment:
q(d，h)＝k1+k2*d+k3*d 2 +k4*d 3 +k5*h+k6*h 2 ；
wherein k1, k2, k3, k4, k5 and k6 are coefficients;
(4) Fitting the sand throwing shape function, the particle size coefficient function and the established physical model to obtain a stacking shape function:
F(h，V，d)＝X f(h，V) *q(d，h)；
f is a stack shape function comprising slope, height and extent of the stack.
The further preferable technical scheme of the invention is that the value range of the sediment grain diameter d is as follows: 0.3 mm-1.3 mm.
Preferably, the value range of the water depth H of the sand throwing point is larger than 5m.
Preferably, when calculating the slope of the stack, p1= -3.3178 in the sand throwing shape function of step (2); p2= -0.3302; p3= 0.0452; p4= 3.1235; p5= -0.8622; p6= 0.0946; p7= -0.0036;
in the particle size coefficient function of step (3), k1= 0.9735; k2 -2.7201; k3 = 5.2352; k4 -2.2379; k5 -0.0060; k6 =2.62E-05.
Preferably, when calculating the height of the stack, p1= -24.1340 in the sand throwing shape function of step (2); p2= -1.0941; p3=0.1625; p4= 21.2611; p5= -6.0073; p6= 0.673E3; p7= -0.025;
in the particle size coefficient function of step (3), k1= 1.4231; k2 -6.4994; k3 = 9.9856; k4 -4.0253; k5 =0.0061; k6 -6.05E-05.
Preferably, in calculating the range of the stack, p1= -3.5276 in the sand throwing shape function of step (2); p2= 0.5018; p3= -0.0126; p4= 3.4652; p5= -0.9884; p6= 0.1164; p7= -0.004;
in the particle size coefficient function of step (3), k1= 1.1590; k2 = 1.6047; k3 -3.0227; k4 = 1.2768; k5 -0.0007; k6 =5.70E-06.
The beneficial effects are that: according to the invention, a physical model is built through collected historical data of the trailing suction hopper dredger under the condition of a bottom throwing operation mode, and a relation formula of the underwater sediment accumulation body under the condition of the bottom throwing operation mode of the dredger is summarized and fitted, wherein morphological parameters comprise an accumulation body side slope, a height and a range, and the morphology of the underwater sediment accumulation body is rapidly calculated according to the fitted relation formula of the underwater sediment accumulation body according to the mud throwing amount, the mud throwing depth and the sediment grain size of the bottom throwing operation of the dredger, so that the operation mode of the dredger is guided and optimized; in the operation process of the dredging ship, the conditions of diffusion distribution, accumulation formation and the like of sediment in the unloading operation under water can be mastered through quantification of working condition boundary conditions, so that the construction scheme can be adjusted in time, the workload of secondary carrying, slope arrangement and the like generated in the later period is reduced, and the engineering cost is reduced.
Drawings
FIG. 1 is a schematic view of the construction of the suction hopper dredger of the present invention in a bottom throwing operation;
FIG. 2 is a flow chart of the calculation of the present invention.
Detailed Description
The technical scheme of the invention is described in detail below through the drawings, but the protection scope of the invention is not limited to the embodiments.
Examples: the calculation method of sediment accumulation body form when the bottom of the trailing suction hopper dredger is thrown takes a new sea phoenix dredging ship as a prototype, firstly, data of the trailing suction hopper dredger 1 under the condition of bottom throwing operation mode are collected, the data comprise sand throwing quantity V, unit of the sand particle diameter d, unit of mm, water depth H of a sand throwing point, unit of cm and side slope, height and range data of the accumulation body, a physical model is established, and the value range of the sand particle diameter d is as follows: the value range of the water depth H of the sand throwing point is more than 5m and is 0.3 mm-1.3 mm.
Then, a sand throwing shape function is established according to the sand throwing amount, the sand throwing point water depth and the sediment grain diameter:
f(h，V)＝p1+p2*h+p3*h2+p4*C+p5*C2+p6*C3+p7*C4；
q(d，h)＝k1+k2*d+k3*d2+k4*d3+k5*h+k6*h2；
where h=lg (H), c=lg (V), p1, p2, p3, p4, p5, p6, k1, k2, k3, k4, k5 and k6 are coefficients;
finally, a heap shape function is obtained:
F(h，V，d)＝Xf(h，V)*q(d，h)；
f is a stack shape function comprising slope, height and extent of the stack.
When calculating the slope of the stack, p1= -3.3178; p2= -0.3302; p3= 0.0452; p4= 3.1235; p5= -0.8622; p6= 0.0946; p7= -0.0036; k1 = 0.9735; k2 -2.7201; k3 = 5.2352; k4 -2.2379; k5 -0.0060; k6 =2.62E-05.
When calculating the height of the stack, p1= -24.1340; p2= -1.0941; p3=0.1625; p4= 21.2611; p5= -6.0073; p6= 0.673E3; p7= -0.025; k1 = 1.4231; k2 -6.4994; k3 = 9.9856; k4 -4.0253; k5 =0.0061; k6 -6.05E-05.
When calculating the range of the stack, p1= -3.5276; p2= 0.5018; p3= -0.0126; p4= 3.4652; p5= -0.9884; p6= 0.1164; p7= -0.004; k1 = 1.1590; k2 = 1.6047; k3 -3.0227; k4 = 1.2768; k5 -0.0007; k6 =5.70E-06.
As described above, although the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The calculation method of the sediment accumulation body form during bottom throwing of the trailing suction hopper dredger is characterized by comprising the following steps:
(1) Collecting data of the drag suction dredger under the condition of bottom throwing operation mode, wherein the data comprises a sand throwing amount V and a unit of cm 3 The sediment grain diameter d is in mm, the sand throwing point water depth H is in cm, and the side slope, the height and the range of the stacking body are data, and a physical model is established;
(2) Establishing a sand throwing shape function according to the sand throwing amount and the water depth of a sand throwing point:
f(h，V)= p1+p2*h+p3*h 2 +p4*C+p5*C 2 +p6*C 3 +p7*C 4 ；
where h=lg (H), c=lg (V), P1, P2, P3, P4, P5, P6 and P7 are coefficients;
(3) Establishing a particle size coefficient function according to the water depth of the sand throwing point and the particle size of the sediment:
q(d，h)= k1+k2*d+k3*d 2 +k4*d 3 +k5*h+k6*h 2 ；
where h=lg (H), k1, k2, k3, k4, k5 and k6 are coefficients;
(4) Fitting the sand throwing shape function, the particle size coefficient function and the established physical model to obtain a stacking shape function:
F（h，V，d）= X f（h，V） *q（d，h）；
f is a stack shape function comprising slope, height and extent of the stack.
2. The method for calculating the form of sediment accumulation during bottom throwing of the trailing suction hopper dredger according to claim 1, wherein the method comprises the following steps: the value range of the sediment grain diameter d is as follows: 0.3 mm-1.3 mm.
3. The method for calculating the form of sediment accumulation during bottom throwing of the trailing suction hopper dredger according to claim 2, wherein the method comprises the following steps: the value range of the water depth H of the sand throwing point is more than 5m.
4. The method for calculating the form of sediment accumulation during bottom throwing of the trailing suction hopper dredger according to claim 3, wherein: when calculating the side slope of the accumulation body, in the sand throwing shape function in the step (2), p1= -3.3178; p2= -0.3302; p3= 0.0452; p4= 3.1235; p5= -0.8622; p6= 0.0946; p7= -0.0036;
in the particle size coefficient function of step (3), k1= 0.9735; k2 -2.7201; k3 = 5.2352; k4 -2.2379; k5 -0.0060; k6 =2.62×10 -5 。
5. The method for calculating the form of sediment accumulation during bottom throwing of the trailing suction hopper dredger according to claim 3, wherein: when the height of the accumulation body is calculated, in the sand throwing shape function in the step (2), p1= -24.1340; p2= -1.0941; p3=0.1625; p4= 21.2611; p5= -6.0073; p6=0.673×10 3 ；p7=-0.025；
In the particle size coefficient function of step (3), k1= 1.4231; k2 -6.4994; k3 = 9.9856; k4 -4.0253; k5 =0.0061; k6 -6.05 x 10 -5 。
6. The method for calculating the form of sediment accumulation during bottom throwing of the trailing suction hopper dredger according to claim 3, wherein: when calculating the range of the accumulation body, in the sand throwing shape function in the step (2), p1= -3.5276; p2= 0.5018; p3= -0.0126; p4= 3.4652; p5= -0.9884; p6= 0.1164; p7= -0.004;
in the particle size coefficient function of step (3), k1= 1.1590; k2 = 1.6047; k3 -3.0227; k4 = 1.2768; k5 -0.0007; k6 =5.70×10 -6 。
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| CN107090799A (en) * | 2016-02-17 | 2017-08-25 | 上海河口海岸科学研究中心 | The method that the mud period is thrown in waterway dredging is determined based on silt loss rate minimum criteria |
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| CN107090799A (en) * | 2016-02-17 | 2017-08-25 | 上海河口海岸科学研究中心 | The method that the mud period is thrown in waterway dredging is determined based on silt loss rate minimum criteria |
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| 耙吸式挖泥船施工工艺在榕江航道整治工程中应用;王刚;《中国水运(下半月)》;20170715(第07期);全文 * |
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