Flow state regulation and control ecological river channel based on Tesla valve

Abstract

The utility model discloses a flow state regulation and control ecological river channel based on a Tesla valve. The flow state regulation and control ecological river channel based on the Tesla valve is suitable for an inland river communicated with an outer river channel with pollution load impact. River banks on the two sides of the inland river are river bank slopes which are provided with a plurality of inwards-concave zigzag structures in the water flow direction. Vegetation islands are arranged in all the sawtooth-shaped structures, and the inland river is divided into a Tesla valve structure. According to the river channel flow state simulation method, a hydrodynamic module in MIKE software, namely an HD module, is adopted for river channel flow state simulation. According to the utility model, the zigzag river bank slope is constructed and the vegetation island is embedded and built, so that the impact of the flow and pollution load of the peripheral river on the inland river under the condition of reciprocating flow is regulated and controlled.

Description

Technical Field

[0001] This utility model relates to the field of river flow regulation technology, and in particular to ecological river flow regulation based on Tesla valves. Background Technology

[0002] In plain river network areas, the water network is crisscrossed and the water system is complex. It is usually affected by a variety of factors such as topography, tides, wind direction or water conservancy projects. The water flow is characterized by unpredictable flow, large changes in flow velocity, uneven distribution of dynamics and significant mixing.

[0003] Intensive human activity has also brought water environment problems to the plain river network areas, such as... Figure 1 The existing straight waterways that are directly connected to large external water bodies are mainly characterized by turbidity, water pollution, and ecological degradation due to the impact of external river water volume and pollution load, resulting in poor sensory quality.

[0004] Therefore, how to maintain the connectivity of rivers and lakes without affecting the storage capacity, grasp the relationship between nature and human intervention, and rely on natural forces to promote ecological restoration has become a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of the above-mentioned deficiencies of the prior art, this utility model provides a flow regulation ecological river based on Tesla valve. The purpose is to grasp the relationship between nature and human intervention, maintain the connectivity of rivers and lakes without affecting the storage space, and rely on natural forces to promote ecological restoration.

[0006] To achieve the above objectives, this utility model discloses a flow regulation ecological river channel based on a Tesla valve, which is applicable to inland rivers connected to external rivers with pollution load impacts.

[0007] Both sides of the inland river are riverbank slopes with several concave sawtooth structures along the direction of water flow.

[0008] All of the aforementioned sawtooth structures contain vegetation islands, which divide the inland river into Tesla valve-like structures.

[0009] Preferably, each of the vegetated islands is formed by a series of deeply driven precast concrete piles to form a continuous retaining wall;

[0010] Each pair of adjacent precast concrete piles has a matching concave-convex coupling surface on the side where they meet.

[0011] The beneficial effects of this utility model are:

[0012] The utility model constructs a sawtooth-shaped riverbank slope and embeds vegetation islands to regulate the impact of the flow and pollution load of the outer river channel on the inland river under reciprocating flow conditions.

[0013] Compared with rigid revetments, existing ecological river channels in plain river network areas mainly include natural vegetation revetments, gabion revetments, ecological concrete revetments, and wooden structure revetments. These revetments place greater emphasis on the exchange of matter and energy between the bank slope and the water body, resulting in good biological connectivity and realizing the concept of "ecology first, following the way of nature".

[0014] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0015] Figure 1 A schematic diagram of the existing technology is shown.

[0016] Figure 2 A schematic diagram of an embodiment of the present invention is shown.

[0017] Figure 3 This diagram shows a partially enlarged structural schematic of an embodiment of the present invention.

[0018] Figure 4 This diagram illustrates the principle of a Tesla valve in one embodiment of the present invention.

[0019] Figure 5 This diagram shows a structural schematic of the water-facing side of a precast concrete pile in one embodiment of the present invention.

[0020] Figure 6 This diagram shows a structural schematic of the backwater side of a precast concrete pile in one embodiment of the present invention.

[0021] Figure 7 This diagram illustrates a method for simulating forward flow using a Mike21 in one embodiment of the present invention.

[0022] Figure 8 This diagram illustrates a method for simulating reverse flow using a Mike21 in one embodiment of the present invention. Detailed Implementation

[0023] Example

[0024] like Figure 2 and Figure 3 As shown, the flow regulation ecological river based on Tesla valve is suitable for inland river 2 connected to external river 1 with pollution load impact.

[0025] Both sides of the inland river 2 are riverbank slopes with several concave sawtooth structures 21 along the direction of water flow.

[0026] All the serrated structures 21 are equipped with vegetation islands 22, which divide the inland river 2 into Tesla valve structures.

[0027] like Figure 4 As shown, the Tesla valve is a one-way valve with no moving parts based on fluid dynamics. It works entirely by relying on the principles of fluid dynamics, without the need for mechanical moving parts. It has a simple and durable structure, and its forward and reverse flow are different.

[0028] When the fluid flows in the forward direction, the resistance to the flow channel inside the valve is small, allowing for efficient passage. When the fluid flows in the reverse direction, strong turbulence and eddies are generated within the flow channel, leading to a significant increase in flow resistance, thus effectively suppressing reverse flow. This asymmetric flow characteristic enables the Tesla valve to achieve unidirectional flow control without the need for mechanical components or power requirements, and it has advantages such as simple structure, high durability, and low maintenance costs.

[0029] This utility model constructs an ecological river channel based on the Tesla valve principle. The distance between the serrated tip and the original straight riverbank is b, the original river width is B, and the wedge-shaped vegetation island forms an angle α with the original riverbank protection. The dimensions of each part are determined within a reasonable range based on the actual situation.

[0030] like Figure 5 and Figure 6 As shown, in some embodiments, each vegetation island 22 is formed by a number of deeply driven precast concrete piles 23 to form a continuous retaining wall.

[0031] Each pair of adjacent precast concrete piles 23 has a matching concave-convex coupling surface on the side where they meet.

[0032] In practical applications, the vegetation island 22 uses precast concrete piles 23, which are deeply inserted into the bank foundation and coupled with the concave and convex surfaces of the interface to form a continuous retaining wall, thereby constructing a sawtooth riverbank slope and embedded vegetation islands, so that the inland waterway 2 forms a Tesla valve structure.

[0033] This invention achieves reverse flow inhibition through the unique geometric design of the Tesla valve. The ecological river channel constructed based on the Tesla valve principle has the function of unidirectional flow regulation. The flow from the outer river channel 1 to the inner river channel 2 is reversed, while the flow from the inner river channel 2 to the outer river is forward. The two sawtooth-shaped riverbanks of the inner river channel 2, along with the embedded vegetation islands 22, construct a channel with a reverse flow inhibition effect.

[0034] When the fluid flows in the forward direction, the resistance is small and it can pass through smoothly; when it flows in the reverse direction, the fluid generates a large number of eddies and turbulence, which significantly increases the flow resistance and thus effectively blocks the reverse flow.

[0035] This utility model also discloses a method for simulating the flow state of an ecological river based on a Tesla valve, which uses the hydrodynamic module, namely the HD module, in the MIKE software to simulate the flow state of the river.

[0036] Among them, the governing equations for the conservation of mass and momentum in shallow water flow, averaged along the water depth, are:

[0037]

[0038]

[0039] Where H represents the water depth;

[0040] h represents the clear water depth;

[0041] ξ represents the water level;

[0042] H = h + ξ;

[0043] t represents time;

[0044] p and q are the fluxes in the X and Y directions, respectively;

[0045] C is the Xie Cai coefficient;

[0046] g is the acceleration due to gravity;

[0047] f is the Coriolis force coefficient;

[0048] ρ is the density of water;

[0049] W, W x W y These represent wind speed and its components in the X and Y directions, respectively.

[0050] f w This refers to the wind resistance coefficient.

[0051] τ xx τ xy τ yy This represents the effective shear force component.

[0052] MIKE software, developed by the Danish Hydrographic Institute (DHI), is a mathematical simulation software that integrates simulation functions for rainfall runoff, groundwater, rivers, and even oceans, as well as the physical, chemical, and biological simulation of water pollutants. The hydrodynamic module (HD module) in MIKE 21 software is its core basic module, which can simulate water level and flow changes, as well as any two-dimensional free surface flow that ignores stratification.

[0053] like Figure 7 and Figure 8 As shown, the simulation results of the flow regulation ecological river based on the Tesla valve were obtained by using Mike21. Under the same boundary conditions, the forward flow is greater than the reverse flow, which can effectively block the impact of the flow and pollution load of the outer river on the inland river.

[0054] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A Tesla valve based flow regime regulating ecological river, suitable for an inner river (2) connected with an outer river (1) with pollution load impact; characterized in that, both sides of the inner river (2) are river bank slopes with a plurality of concave sawtooth structures (21) arranged along the water flow direction; all the sawtooth structures (21) are provided with vegetation islands (22) to divide the inner river (2) into a Tesla valve structure.

2. The flow regime regulated eco-stream based on Tesla valve according to claim 1, characterized in that, each vegetation island (22) is formed by a plurality of deeply inserted concrete precast piles (23) to form a continuous retaining wall; one side of each two adjacent concrete precast piles (23) is provided with a concave-convex surface coupling surface matched with each other.

Images