A comprehensive treatment scheme for dredging, widening and straightening and submerged dam control of a navigation channel of a Yangtze River Jinjiang 105 floating navigation section in Zhenjiang, Jiangsu

Abstract

This invention discloses a comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Zhenjiang 105 buoy section, aiming to solve long-standing problems such as turbulent water flow, sharp bends, narrow channels, and easy siltation in this section. The scheme includes: dredging, widening, and straightening the shallow waters and tidal flats south of the 103-1 red buoy and the shallow waters north of the 100 black buoy 600 meters upstream of the old Fuxing Shipyard; adjusting navigation marks; constructing a half-width submerged dam at the upper reaches of the Hechangzhou Island, using a layered structure with sandbags at the bottom and crushed stone mixed with boulders at the top, to achieve long-term flow control and flood discharge during flood season; employing multiple equipment such as sand dredgers and cutter suction dredgers for combined operations; and utilizing the dredged sand for sale and fine sediment for land reclamation. This invention completely solves the navigation bottleneck of the 1O5 buoy by combining physical morphological adjustment with hydrodynamic optimization, and has significant advantages such as being eco-friendly, structurally stable, and low-cost.

Description

Technical Field

[0001] This invention relates to the field of inland waterway management technology, and in particular to a comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River's 105 buoy section in Zhenjiang, Jiangsu Province. Background Technology

[0002] The section of the Yangtze River near buoy 105 in Zhenjiang, Jiangsu Province, has long been considered one of the most difficult and risky sections to navigate on the Jiangsu section of the Yangtze. This section has long faced multiple severe challenges, seriously restricting the shipping efficiency and safety of the Yangtze River's golden waterway.

[0003] First, the natural conditions in this section of the waterway are extremely harsh, characterized by its "bends, narrowness, and turbulence." The river forms sharp bends here, particularly near buoy 105, where the channel's curvature is significant, obstructing navigation and making it much more difficult for downstream vessels to maneuver around buoy 105 and maneuver into the bend. Simultaneously, the main channel is severely narrow, leaving insufficient space for upstream and downstream vessels to meet, greatly increasing the risk of congestion and dangerous situations.

[0004] Secondly, turbulent water flow is another major problem in this section of the waterway. Due to the diversion of the Hechangzhou North Branch River, there is a strong crossflow at the outlet of the branch river below the No. 100 black buoy. Upstream vessels or large vessels are easily pushed southward by the crossflow at the branch river outlet in this area, squeezing the downstream route, causing loss of vessel position, creating a tense situation with downstream vessels, and even resulting in violent collisions. Historically, there have been accidents where vessels were swept by the crossflow to the south bank dock and collided.

[0005] Secondly, siltation is a frequent problem in the waterway. Due to the narrow river surface, low water volume, and uneven flow velocity distribution in this section, coupled with the relatively slow flow velocity and small volume in the main channel, silt easily accumulates and back-silts, resulting in insufficient water depth in this section. Traditional treatment methods mainly rely on simple dredging, which is not only costly but also leads to siltation recurring shortly after dredging, creating a vicious cycle of "dredging followed by siltation, and siltation followed by dredging." In addition, existing bank protection facilities are mostly simple piles of rubble, lacking a systematic anti-erosion design, and are unable to withstand the impact of rapid currents during floods.

[0006] Finally, existing remediation solutions often suffer from one problem at the expense of others. While completely blocking the flow of the Beicha Xiaojiang River with a dam would increase the main channel's flow, it would also damage the habitat and breeding grounds of aquatic life (such as fish and finless porpoises) and hinder flood control during the flood season. Conversely, simply widening the channel without adjusting the flow would not fundamentally solve the siltation problem. Therefore, a comprehensive and systematic remediation plan is urgently needed that can balance adjustments to the channel's geometry, optimization of hydrodynamics, ecological protection, and construction economics. Summary of the Invention

[0007] The purpose of this invention is to provide a comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Zhenjiang 105 buoy section, in order to solve the problems in the prior art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River channel at buoy 105 in Zhenjiang, Jiangsu Province, comprising the following steps: Step S1: Dredging and widening of the south bank mudflats. The scope of the project extends from downstream of buoy 106 to buoy 103-1. The shallow mudflats and shoals south of the channel are thoroughly dredged and widened. The river channel is widened and deepened and the river surface is straightened appropriately. Then, buoys 105-1, 105, 104 and 103-1 are simultaneously adjusted to the south to widen the main channel and improve the passage conditions for ships at the sharp turn at buoy 105. Step S2: Dredging and straightening of the shallow waters on the north bank. From about 600 meters upstream of the old Fuxing Shipyard on the south bank of Hechangzhou to the waters of No. 100 black buoy downstream, the shallow waters, mudflats, open and closed channels left by the old shipyard, the relocation and reconstruction of the Jiangxinzhou ferry terminal to the north, old revetments and fishponds will be dredged and cleared. After dredging, widening and deepening along the section, all black buoys 103-1, 103, 102-1, 102, 101-1, 101 and 100 will be adjusted to the north to further widen the main channel and make the channel as a whole appropriately straightened and widened. Step S3: Control and guidance of the submerged dam at the mouth of the North Branch Xiaojiang River. A half-width submerged dam is constructed at the mouth of the North Branch Xiaojiang River at the upper part of Hechangzhou Island. The dam only blocks half of the cross section of the North Branch Xiaojiang River, leaving the other half unblocked. Through this half-width water-blocking structure, part of the water flow of the North Branch Xiaojiang River is diverted into the main channel of the South Channel to increase the water flow velocity in the main channel. The increased flow velocity and water volume are used to flush away silt and prevent the channel from silting up. Step S4: Multi-equipment combination dredging construction. Large sand dredgers and cutter suction dredgers are used in deep water areas, while small sand suction dredgers are used in shallow water areas. In the shore area, engineering machinery is first used to excavate and clear hidden piles, stone dams, slope protection and other trees and weeds, and then the ship dredging operation is carried out. Step S5: Resource utilization of silt. The silt generated from dredging is transported by ship. Medium and coarse sand is recycled and reused or sold to reduce the cost of dredging projects, while fine sand slurry is used for on-site filling or transported to designated locations for land reclamation. Step S6: Bank protection. After the channel dredging is completed, rubble revetments will be laid along the banks from the upstream of the old Fuxing Shipyard to the No. 100 black buoy and from the No. 106 red buoy to the No. 103-1 red buoy to prevent the banks from being eroded and collapsed by the water flow and to maintain the long-term stability of the channel shoreline.

[0009] Furthermore, the submerged dam structure in step S3 adopts a layered construction process, specifically including: Subsurface structure: Large woven bags are used to fill sand with dredged silt on a flatbed boat and then dumped into a designated location on the riverbed as the submerged dam base to reduce costs and improve bottom stability. The superstructure is constructed using a combination of boulders and crushed stone, which is then dumped and stacked using a floating crane. The submerged dam is designed to be exposed above the water surface during low water periods and submerged underwater during major floods, thus ensuring both the control and diversion effect and the safety of flood discharge when large flood volumes overflow the dam.

[0010] Furthermore, in step S3, large-area bottom paving with a mixture of boulders and crushed stones is used to reinforce the bottom of the riverbed around the upstream and downstream of the submerged dam, as well as the other half of the riverbed inlet section where the submerged dam is not sealed. Interlocking plates are laid in necessary locations for reinforcement to compact the area around the submerged dam and the bottom of the riverbed. The interlocking panels are made of concrete blocks connected by ropes to form a whole mesh. They are used to prevent the rapid flow of water from eroding the riverbed and hollowing out the bottom of the riverbed, thus avoiding the collapse or destruction of the submerged dam due to the hollowing out of the dam foundation, thereby ensuring the long-term stability of the submerged dam.

[0011] Furthermore, the riprap filling process used in the submerged dam is as follows: small gravels are mixed between the large riprap, and the small gravels are used to fill the gaps between the large riprap in the water, so as to avoid the formation of excessive water flow space between the riprap, thereby preventing the water flow from violently eroding the bottom of the riverbed and causing dam failure, and ensuring that the submerged dam structure is solid, highly stable and not easily washed away.

[0012] Furthermore, the half-width submerged dam in step S3 has specific ecological and navigation safety effects: By partially blocking the river, the flow rate of the water in the North Branch of the Xiaojiang River is slowed down, thus not affecting the living and reproductive environment of aquatic organisms. At the same time, reducing the outflow of water from the lower reaches of the North Branch River will eliminate the strong crossflow at the outlet and prevent upstream vessels from being pushed southward by the crossflow, thereby eliminating the risk of collisions caused by difficulties in maneuvering vessels going upstream and downstream.

[0013] Furthermore, the multi-equipment combination dredging and desilting operation in step S4 specifically includes: Large sand dredgers (sand pumping kings) from Poyang Lake or Dongting Lake were deployed, along with multiple cutter suction dredgers and multiple small sand suction dredgers, to carry out combined dredging and desilting. For the shallow land area 600 meters upstream of the old Fuxing Shipyard to the No. 100 black buoy area, first use excavators and other machinery to clear obstacles such as boulders, fishpond dams, and trees and weeds at the ferry terminal. After reaching the required depth, use ships to dredge and remove sand to achieve the highest dredging efficiency.

[0014] Furthermore, the specific process for the resource utilization of sediment in step S5 is as follows: Using a sand pumping machine, medium and coarse sand that meets construction requirements can be directly pumped out and loaded onto ships. The cost of dredging and desilting projects can be reduced by selling and transporting the medium and coarse sand away. For fine sand and mud that cannot be used directly, on-site backfilling will be carried out if conditions permit. If on-site backfilling is not possible, it will be transported by ship to other designated locations for backfilling, thereby achieving zero emissions and resource utilization of waste.

[0015] Furthermore, the slope protection construction process in step S6 is as follows: First, flatbed boats are used to transport the boulders to the shore, and then excavators and floating cranes are used to push the boulders into the riverbed to stabilize the shore and the bottom of the river. Once the underwater section has reached the required stability, a sloping riprap revetment is constructed above the water surface. If necessary, durable and leak-proof materials are laid inside the revetment, and small gravel is filled into the gaps between the riprap to form a permanent erosion-resistant revetment structure.

[0016] Furthermore, this method is specifically designed to address the challenges of turbulent water flow, sharp bends, narrow channels, easy tail swings for downstream vessels, and difficulties in the convergence of upstream and downstream vessels in the 105 buoy section of the Yangtze River in Zhenjiang, Jiangsu Province. By combining dredging on the south bank and the north bank with the construction of a half-width submerged dam, the originally winding and narrow waterway has become wide and the water flow is stable, which can accommodate the water volume intercepted by the North Branch River and the flood season water volume, fundamentally solving the long-standing navigation danger problem of this section of the waterway.

[0017] Furthermore, including: The South Bank Dredging Module is configured to dredge and excavate the shallow water tidal flats from downstream of the 106 Red Buoy to south of the 103-1 Red Buoy. The North Bank Dredging Module is configured to dredge and excavate the shallow water area north of the No. 100 Black Buoy, 600 meters upstream of the old Fuxing Shipyard. The submerged dam construction module is configured to construct a half-width submerged dam at the entrance of the Xiaojiang River on the north branch of the upper reaches of Hechangzhou Island; The construction scheduling module is configured to coordinate the joint operation of multiple devices, including large sand dredging vessels, cutter suction dredgers, small sand suction dredgers, and shore-based engineering machinery. The resource management module is configured to classify and process coarse and fine silt generated from dredging, and to transport it for sale or use it for land reclamation.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. Completely eliminate navigation bottlenecks and improve shipping safety and efficiency: Through large-scale dredging, widening, and straightening projects carried out simultaneously on the south bank (south of buoy 106 to buoy 103-1) and the north bank (600 meters upstream of the old Fuxing Shipyard to north of buoy 100), the channel cross-section was physically greatly expanded. Combined with the scientific adjustment of navigation marks (red and black buoys), the originally winding and narrow channel bottleneck was removed, making the passage of upstream and downstream vessels more spacious and smooth. This fundamentally eliminated the collision hazards caused by poor channel conditions and completely solved the long-standing problem of the buoy 105 section.

[0019] A pioneering half-width submerged dam structure achieves a perfect balance between engineering and ecology: A creative "half-width submerged dam" was constructed at the mouth of the Xiaojiang River in the northern branch of Hechangzhou Island, blocking only half of the river surface and leaving half a channel open. This design achieves the dual purpose of diverting part of the Xiaojiang River's flow into the main channel of the southern channel, increasing the flow rate and velocity of the main channel to flush away sediment and prevent siltation, while preserving sufficient ecological flow and not affecting the survival and reproduction environment of aquatic life in the Xiaojiang River. Furthermore, the submerged dam is designed to be exposed above water at low water levels and submerged during major floods, ensuring that floodwaters can smoothly overflow the dam during the flood season without affecting flood control safety, thus resolving the conflict between traditional full-closure projects and ecological and flood control considerations.

[0020] A long-term anti-siltation mechanism significantly reduces maintenance costs: By controlling the flow rate and velocity of water in the main channel of the South Channel through submerged dams, and utilizing the principles of fluid dynamics, the water flow has a stronger sand-carrying capacity, making it less likely for sediment to remain and silt up in the channel. This self-cleaning function of "washing sand with water" achieves long-term self-maintaining smooth navigation compared to the traditional passive method of relying solely on a single dredging point, greatly reducing the frequency and cost of subsequent maintenance.

[0021] The innovative submerged dam construction technique ensures a robust and permanent structure: the submerged dam employs a unique layered heterogeneous structure. The bottom layer uses large woven bags filled with sand on flatbed boats and then dumped, a cost-effective method that adapts to riverbed deformation. The upper layer uses a graded filler of boulders mixed with crushed stone, with small crushed stones filling the gaps between the large stones, preventing water flow from eroding the dam body through these gaps. Combined with the boulders and crushed stone paving upstream and downstream and the riverbed bottom, as well as the reinforcement with interlocking concrete plates, this effectively prevents high-speed water flow from scouring the dam foundation, ensuring the permanent stability of the engineering structure and preventing collapse and erosion.

[0022] The collaborative use of multiple equipment and resource utilization yields significant economic benefits: Large-scale sand dredgers from Poyang Lake and Dongting Lake were creatively introduced into the Yangtze River waterway dredging project. These dredgers, combined with cutter suction dredgers, small sand suction dredgers, and shore-based engineering machinery, achieved highly efficient dredging operations. Simultaneously, a circular economy process was established: the medium-coarse sand dredged and meeting construction standards is recycled and sold, while the fine sand and slurry are used for on-site or off-site land reclamation. This model transforms the originally high dredging costs into resource benefits, significantly reducing project costs and possessing high potential for widespread adoption. Attached Figure Description

[0023] Figure 1 This is a flowchart of the comprehensive management plan for the 105 buoy section of the Yangtze River in Zhenjiang, Jiangsu Province, according to the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1: Comprehensive improvement of the geometric shape of the waterway on the south and north banks This embodiment details how to change the “bend and narrow” status of the 105 buoy section through physical dredging.

[0026] The first step was to dredge and widen the mudflats on the south bank. The construction area was strictly defined as the area south of the channel between buoy 106 and buoy 103-1. Addressing the issues of shallow water, protruding shoals, and insufficient water depth in this area, excavators were first used to clear debris from the bank. Subsequently, engineering vessels were deployed to conduct comprehensive dredging and excavation of the mudflats and shoals in this area. The excavation standards required not only increased depth but also widening, and appropriate straightening of the river channel. After the dredging was completed, buoys 105-1, 105, 104, and 103-1 were simultaneously adjusted southward, thereby physically widening the navigable width of the main channel and eliminating the sharp turns observed at buoy 105.

[0027] Next, dredging and straightening of the shallow waters on the north bank were carried out. The construction started approximately 600 meters upstream of the old Fuxing Shipyard on the south bank of Hechangzhou Island and extended downstream to the No. 100 black buoy. This area was complex, containing shallow waters and mudflats north of the black buoy, remnants of the old shipyard's open and concealed channels and piles, old revetments, fishpond enclosures, and a ferry terminal. Construction workers first used engineering machinery to excavate and clear these obstacles, then used vessels for underwater dredging, widening and deepening the section. After dredging to the required standard, black buoys 103-1, 103, 102-1, 102, 101-1, 101, and 100 were all adjusted to the north. Through this series of operations, the channel was further straightened and widened, completely resolving the congestion problem in this section of the channel.

[0028] Example 2: Refined Construction of a Half-width Submerged Dam at the Upper Mouth of the Xiaojiang River in the North Branch This embodiment focuses on describing the construction technology and structural innovations of the core structure—the half-width submerged dam.

[0029] The submerged dam is located at the mouth of the Xiaojiang River in the northern branch of Hechangzhou. Its unique feature is that it "blocks half of the water," meaning that only half of the Xiaojiang River in the northern branch is blocked, while the other half remains open.

[0030] The specific construction process is as follows: Bottom layer construction: Large woven bags are used to fill the bags with dredged silt and sand on a flatbed boat, and then the bags are precisely thrown into the predetermined position on the riverbed to form a soft and stable submerged dam bottom foundation.

[0031] Upper-level construction: A floating crane is used to throw and pile up a mixture of boulders and crushed stones. The key is to "mix small crushed stones between large boulders," using the small crushed stones to fill the gaps between the large boulders in the water, thus preventing the water flow from eroding the dam body due to excessive water flow space between the boulders.

[0032] Height control: The design height of the submerged dam strictly follows the standard that "the dam body is exposed above the water surface during low water periods and submerged underwater during major floods" to ensure long-term flow control and flood discharge during major floods.

[0033] Peripheral reinforcement: Large-scale paving of rubble mixed with crushed stone is used to reinforce the riverbed both upstream and downstream of the submerged dam, as well as the unsealed section of the riverbed at the dam's inlet. In areas with particularly rapid currents, interlocking panels are added for further reinforcement. These interlocking panels, composed of concrete blocks connected by ropes to form a mesh, effectively prevent the rapid current from eroding the riverbed and hollowing out the bottom, avoiding dam foundation erosion and subsequent collapse, thus ensuring the long-term stability of the submerged dam.

[0034] Example 3: Combined dredging and sediment resource utilization using multiple equipment This example illustrates how to efficiently and cost-effectively complete large-scale dredging operations.

[0035] Considering the large workload and tight schedule, this embodiment adopts a multi-equipment combined construction mode.

[0036] Equipment deployment: Large sand dredgers from Poyang Lake and Dongting Lake were deployed, utilizing their powerful suction and screening capabilities; multiple cutter suction dredgers were used in conjunction with these vessels to treat specific areas; smaller sand suction dredgers were used in shallow water areas. For the land and shallow waters in the area from the old Fuxing Shipyard to the No. 103-1 mile to the No. 100 black buoy, excavators and other machinery were first used to clear obstacles such as boulders, fishpond dams, ferry terminals, trees, and weeds to reach the required depth before vessels were used for dredging and desilting.

[0037] Sediment treatment and resource utilization: Utilization of medium and coarse sand: The medium and coarse sand extracted by the sand pumping machine (meeting the particle size required for construction) is directly loaded onto ships and sold overseas, reducing the cost of dredging and desilting projects.

[0038] Fine sand treatment: For fine sand slurry that cannot be used directly, on-site backfilling will be carried out if conditions permit; otherwise, barges will be used to transport it to a designated location for land reclamation.

[0039] This integrated circular economy model of "extraction, screening, transportation, sales and landfill" not only efficiently completed the dredging task, but also transformed the original waste into resources, significantly reducing the project cost.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River channel at buoy 105 in Zhenjiang, Jiangsu Province, characterized in that: Includes the following steps: Step S1: Dredging and widening of the south bank mudflats. The scope of the dredging extends from downstream of buoy 106 to buoy 103-1. The shallow mudflats and shoals south of the channel are thoroughly dredged and widened. The river channel is appropriately straightened by deepening and widening the dredging. Then, buoys 105-1, 105, 104, and 103-1 are simultaneously adjusted to the south to widen the main channel and improve the passage conditions for ships at the sharp turn at buoy 105. Step S2: Dredging and straightening of the shallow waters on the north bank. From about 600 meters upstream of the old Fuxing Shipyard on the south bank of Hechangzhou to the downstream Jiangxinzhou ferry terminal No. 100 black buoy, the shallow waters north of the black buoy, the beach and mudflats, the open and hidden piles left by the old shipyard, the old revetment and fishpond enclosure dam, and the Jiangxinzhou ferry terminal will be dredged and cleared. After dredging and widening along the section, all black buoys 103-1, 103, 102-1, 102, 101-1, 101 and 100 will be adjusted to the north to further widen the main channel and make the channel as a whole appropriately straightened and widened. Step S3: Control and guidance of the submerged dam at the mouth of the North Branch Xiaojiang River. A half-width submerged dam is constructed at the mouth of the North Branch Xiaojiang River at the upper tip of Hechangzhou Island. The dam only blocks half of the North Branch Xiaojiang River, leaving the other half unblocked. Through this half-width water-blocking structure, part of the water flow of the North Branch Xiaojiang River is diverted into the main channel of the South Channel to increase the water volume and flow velocity in the main channel. The increased flow velocity is used to flush away the silt in the channel and prevent the silt from accumulating back into the channel. Step S4: Multi-equipment combination dredging construction. Large sand dredgers and cutter suction dredgers are used in deep water areas, while small sand suction dredgers are used in shallow water areas. In the shore area, engineering machinery is first used to excavate and clear trees, weeds, hidden piles, and slope protection ferry terminals, and then the ship dredging operation is carried out. Step S5: Resource utilization of silt and sand. The silt and sand generated from dredging are transported by ship. The medium and coarse sand is recycled and reused or sold to reduce the cost of dredging and siltation projects, while the fine sand and mud are used for on-site filling or transported to designated locations for land reclamation. Step S6: Bank protection. After the channel dredging is completed, rubble revetments will be laid along the banks from upstream of the old Fuxing Shipyard to the No. 100 black buoy and from the No. 106 red buoy to the No. 103-1 red buoy to prevent the banks from being eroded and collapsed by the water flow and to maintain the long-term stability of the channel shoreline.

2. The comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Jiangsu Zhenjiang 105 buoy section as described in claim 1, characterized in that: The submerged dam structure in step S3 adopts a layered construction process, specifically including: Subsurface structure: Large woven bags are filled with sand on a flatbed boat and then thrown into the riverbed at a designated location to serve as the submerged dam base, in order to reduce costs and improve bottom stability; The superstructure is constructed using a combination of boulders and crushed stone, which is then dumped and stacked using a floating crane. The submerged dam is designed to be exposed above the water surface during low water periods and submerged underwater during major floods, thus ensuring both the control and diversion effect and the safety of flood discharge when large volumes of water are discharged over the dam.

3. The comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Jiangsu Zhenjiang 105 buoy section as described in claim 2, characterized in that: In step S3, large-area paving is carried out on the bottom of the riverbed around the upstream and downstream of the submerged dam, as well as on the other half of the riverbed inlet section where the submerged dam is not sealed. Interlocking plates are laid for reinforcement when necessary to compact the paving around the submerged dam and the bottom of the riverbed. The interlocking panels are made of concrete blocks connected by ropes to form a whole mesh. They are used to prevent the rapid flow of water from eroding the riverbed and hollowing out the bottom of the riverbed, and to prevent the dam foundation from being hollowed out by the water flow, which would lead to the collapse or destruction of the submerged dam, thereby ensuring the long-term stability of the submerged dam.

4. The comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Zhenjiang 105 buoy section as described in claim 2, characterized in that: The submerged dam employs a riprap filling process that involves mixing small gravel between large stones. This small gravel fills the gaps between the large stones in the water, preventing excessive water flow between them and thus preventing the dam from being destroyed by violent water erosion of the riverbed. This ensures that the submerged dam structure is robust, highly stable, and not easily washed away.

5. The comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Jiangsu Zhenjiang 105 buoy section as described in claim 1, characterized in that, The half-width submerged dam in step S3 has specific ecological and navigation safety effects: By partially blocking the river, the flow rate of the water in the North Branch of the Xiaojiang River is slowed down, thus not affecting the living and reproductive environment of aquatic organisms. At the same time, reducing the outflow at the lower reaches of the North Branch River will eliminate the strong crossflow in the river surface at the lower reaches of the branch river, prevent upstream vessels from being pushed southward by the crossflow at the outlet and squeezing the downstream navigation route, thereby eliminating the risk of collision between upstream vessels and downstream vessels due to difficulty in maneuvering.

6. The comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Zhenjiang 105 buoy section as described in claim 1, characterized in that: The multi-equipment combined dredging operation in step S4 specifically includes: Large sand dredgers (sand pumping kings) from Poyang Lake or Dongting Lake were deployed, along with multiple cutter suction dredgers and multiple small sand suction dredgers, to carry out combined dredging and desilting. For the land and shallow waters in the old Fuxing Shipyard and the area of ​​black buoys 103-1 to 100, first use excavators and other machinery to clear obstacles such as fishponds, fishponds, ferry terminals on Jiangxinzhou Island, trees and weeds, etc., to reach the required depth, and then use ships to dredge sand to achieve the highest dredging efficiency.

7. The comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Jiangsu Zhenjiang 105 buoy section as described in claim 1, characterized in that, The specific process for the resource utilization of sediment in step S5 is as follows: Using a sand pumping machine, medium and coarse sand that meets construction requirements can be directly pumped out and loaded onto ships for sale by shipping, thereby reducing the cost of dredging and desilting projects. For fine sand and mud that cannot be used directly, on-site backfilling will be carried out if conditions permit. If on-site backfilling is not possible, it will be transported by ship to other designated locations for backfilling, thereby achieving zero discharge and resource utilization of waste.

8. The comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Zhenjiang 105 buoy section as described in claim 1, characterized in that, The slope protection construction process in step S6 is as follows: First, flatbed boats are used to transport the stones to the designated bank. Then, excavators and floating cranes push the stones into the designated location on the riverbed to stabilize the riverbed and the bottom of the bank. Once the underwater foundation meets the requirements for a stable shoreline, a sloped riprap revetment is constructed above the water surface. If necessary, a durable, leak-proof woven material is laid inside the revetment, and small gravels are filled into the gaps between the riprap to form a permanent erosion-resistant revetment structure.

9. A comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Zhenjiang 105 buoy section as described in claim 1, characterized in that, This method is specifically designed to address the challenges of turbulent water flow, sharp bends, narrow channels, and difficulties in the convergence of upstream and downstream vessels in the Zhenjiang section of the Yangtze River at buoy 105 in Jiangsu Province. By combining dredging on the south bank and the north bank with the construction of a half-width submerged dam, the originally winding and narrow waterway has become wide and the water flow is stable, which can accommodate the water volume intercepted by the North Branch River and the flood season water volume, fundamentally solving the long-standing problem of difficult navigation and dangerous conditions in this section of the waterway.

10. A comprehensive management scheme for dredging, widening, straightening, and submerged dam control of the Yangtze River Jiangsu Zhenjiang 105 buoy section channel according to any one of claims 1 to 9, characterized in that, include: The south bank dredging module is configured to dredge and clear silt from downstream of the 106 Red Buoy to south of the 103-1 Red Buoy. The North Bank Dredging Module is configured to dredge and clean the shallow shoreline from upstream of the old Fuxing Shipyard to north of Buoy No.

100. The submerged dam construction module is configured to construct a half-width submerged dam at the entrance of the Xiaojiang River on the north branch of Hechangzhou Island. The construction scheduling module is configured to coordinate the joint operation of multiple devices, including large sand dredging vessels, cutter suction dredgers, small sand suction dredgers, and shore-based engineering machinery. The resource management module is configured to classify, process, transport, or reclaim land from medium, coarse, and fine sediment generated during dredging.

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