Calculation method for obstructed flood discharge degree in river channel management range
By calculating the projection area, density coefficient and water blocking area of the barriers within the river management range, a calculation formula for hindering the degree of flooding is constructed, which solves the problem of lack of systematic and quantitative evaluation methods in the existing technology, and realizes accurate assessment of the degree of flooding and scientific river management planning.
Patent Information
- Application Number
- CN202411990573.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-05-02
AI Technical Summary
The existing technology lacks systematic and quantitative methods to evaluate the impact of obstacles within the river management scope on flood safety, making it difficult to effectively evaluate and control, affecting the layout, management and improvement of flood control facilities.
By calculating the projection area, density coefficient and water blocking area of the barrier, a calculation formula that hinders the degree of flooding is constructed. The specific steps include obtaining the river management range, calculating the projection area, determining the density coefficient, calculating the water blocking area, obtaining the river section area and the area of the barrier, measuring the water depth at the cross-sectional position, constructing the calculation formula and performing calculation.
It provides an accurate assessment of the degree of flood control, provides river management with quantitative data basis, realizes scientific planning and reasonable analysis, and improves the scientificity and objectivity of river management.
Smart Images
Figure CN119917766A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of river management, and in particular to a method for calculating the degree of obstruction to flood discharge within a river management range. Background Art
[0002] In river management and protection, ensuring the safety of river flood discharge is an important issue in protecting the lives and property of people in riverside areas. The flood discharge capacity of a river is affected by many factors, among which the existence of obstacles often has a significant impact on the normal flow of floods. Especially in the context of accelerated urbanization, more and more buildings (structures) are built within the scope of river management. These buildings (structures) may hinder the flow of river floods, thereby increasing the risk of flooding and threatening the lives and property of the people.
[0003] At present, the research on the degree of obstruction of flood flow by obstacles within the scope of river management is mostly focused on macro analysis and theoretical discussion, but lacks systematic and quantitative evaluation methods. This makes it difficult to effectively evaluate and control the impact of these obstacles on flood safety in actual river management and planning, which in turn affects the layout, management and improvement of flood control facilities. Existing evaluation methods mainly rely on expert experience or simple qualitative analysis, which lacks scientificity and objectivity. In addition, existing standards and specifications often fail to consider the specific impact of different obstacles on flood flow patterns, resulting in the inability to provide effective response measures when floods come. Summary of the invention
[0004] In order to solve the above problems, an embodiment of the present invention aims to provide a method for calculating the degree of obstruction to flood discharge within a river management area.
[0005] A method for calculating the degree of obstruction to flood discharge within a river management area, comprising:
[0006] Step 1: Obtain the management scope of the target river;
[0007] Step 2: Calculate the projected area of obstacles parallel to the water flow direction within the management scope of the target river;
[0008] Step 3: Determine the density coefficient according to the type of obstacle;
[0009] Step 4: Determine the water blocking area using the density coefficient and the projection area;
[0010] Step 5: Obtain the cross-sectional area of the river channel and the area occupied by the obstacles perpendicular to the water flow direction;
[0011] Step 6: Take n cross sections at different locations of the barrier and measure the water depth occupied by the barrier at the corresponding cross section and the water depth at the main channel of the river under the corresponding flood control standard;
[0012] Step 7: Construct a calculation formula for the degree of flood obstruction based on the water depth occupied by the obstruction at the corresponding cross-sectional location, the water depth at the main channel of the river, the water blocking area and the area occupied by the obstruction;
[0013] Step 8: Use the above-mentioned flood obstruction degree calculation formula to complete the calculation of the flood obstruction degree of the obstacles within the river management scope.
[0014] Preferably, the types of obstacles include: buildings and objects with dense flow holes or gaps.
[0015] Preferably, in step 3, when the type of obstacle is a building, the density coefficient ρ is 1, and when the type of obstacle is an object with dense flow holes or gaps, the density coefficient ρ = S projection / S contour; wherein S projection is the projection area of the object with dense flow holes or gaps, and S contour is the contour area of the object with dense flow holes or gaps.
[0016] Preferably, in step 4, when ρ<0.5, S water blocking=S projection; when 0.5<ρ<0.75, S water blocking=1.5S projection; when 0.75<ρ<1, S water blocking=S contour, and S water blocking is the water blocking area.
[0017] Preferably, in step 7, the calculation formula for the degree of obstruction to flood discharge is:
[0018]
[0019] Among them, X is the value of the degree of obstruction to flood discharge, Swater blocking is the water blocking area, Sriver section is the cross-sectional area of the river, Soccupied area is the land area, Sriver section plane is the plane area of the river section where Soccupied area is located, Hn is the water depth occupied by the obstruction at the nth cross-sectional position, H 主河槽 is the water depth in the main channel of the river at the nth section position.
[0020] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:
[0021] The present invention relates to a method for calculating the degree of obstruction to flood flow within a river management area. Compared with the prior art, the present invention can provide an accurate assessment of the degree of obstruction to flood flow by calculating parameters such as the projected area, density coefficient and water blocking area of obstacles, thereby providing a quantitative data basis for river managers and enabling scientific planning and reasonable analysis when determining the problem of obstruction to flood flow within the river management area.
[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 A flow chart of a method for calculating the degree of obstruction to flood discharge within a river management range in an embodiment provided by the present invention;
[0025] Figure 2 The general building projection area calculation principle in the embodiment provided by the present invention;
[0026] Figure 3 The calculation principle of the projected area of an object with dense flow holes or gaps in the embodiment provided by the present invention;
[0027] Figure 4 A schematic diagram of the calculation principle of the floor area of a building in the embodiment provided by the present invention;
[0028] Figure 5 A schematic diagram of the calculation principle of the water depth occupied by a building in the embodiment provided by the present invention;
[0029] Figure 6 This is a schematic diagram of the water depth calculation principle at the main channel of the river in the embodiment provided by the present invention. DETAILED DESCRIPTION
[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0033] See also Figure 1 , a method for calculating the degree of obstruction to flood discharge within the river management area, including:
[0034] Step 1: Obtain the management scope of the target river;
[0035] Step 2: Calculate the projected area of obstacles parallel to the water flow direction within the management scope of the target river;
[0036] Step 3: Determine the density coefficient according to the type of obstacle;
[0037] See also Figure 2-3 For general buildings (structures), calculate the projection area S projection parallel to the water flow direction. For objects with dense holes or gaps for flow, such as concentrated fishing gear, trees, and cages, treat them as a whole, and calculate their contour area S contour based on the calculated projection area.
[0038] For general buildings (structures), the density coefficient ρ is 1. For objects such as fishing gear, trees, and cages, the density coefficient ρ = S projection / S profile.
[0039] Step 4: Determine the water blocking area using the density coefficient and the projection area;
[0040] When ρ<0.5, S water blocking = S projection; when 0.5<ρ<0.75, S water blocking = 1.5S projection; when 0.75<ρ<1, S water blocking = S contour, and S water blocking is the water blocking area.
[0041] Step 5: Obtain the cross-sectional area of the river channel and the area occupied by the obstacles perpendicular to the water flow direction;
[0042] See also Figure 4 After calculating the land area Sland, the present invention also needs to calculate the plane area Sriver section plane of the river section where Sland is located; wherein, the upstream and downstream river section edges are bounded by the upstream and downstream edges of the building (structure) land area, and the left and right bank edges are bounded by the river management scope.
[0043] Step 6: Take n cross sections at different locations of the barrier and measure the water depth occupied by the barrier at the corresponding cross section and the water depth at the main channel of the river under the corresponding flood control standard;
[0044] See also Figure 5-6 First, take n cross sections at different parts of the building (structure) (selected at equal distances, n is generally 5 to 10), and measure the water depth H1, H2, ..., Hn occupied by the building (structure) at the corresponding location under the corresponding flood control standard. Then calculate the water depth H at the main channel of the river corresponding to the location of the n points under the corresponding flood control standard. 主河槽 1, H 主河槽 2, ..., H 主河槽 n.
[0045] Step 7: Construct a calculation formula for the degree of flood obstruction based on the water depth occupied by the obstruction at the corresponding cross-sectional location, the water depth at the main channel of the river, the water blocking area and the area occupied by the obstruction;
[0046] In step 7, the calculation formula for the degree of flood obstruction is:
[0047]
[0048] Among them, X is the value of the degree of obstruction to flood discharge, Swater blocking is the water blocking area, Sriver section is the cross-sectional area of the river, Soccupied area is the land area, Sriver section plane is the plane area of the river section where Soccupied area is located, Hn is the water depth occupied by the obstruction at the nth cross-sectional position, H 主河槽 is the water depth in the main channel of the river at the nth section position.
[0049] Step 8: Use the above-mentioned flood obstruction degree calculation formula to complete the calculation of the flood obstruction degree of the obstacles within the river management scope.
[0050] If X is lower than 5%, it is considered as a slight obstruction to flood flow; if it is between 5% and 10%, it is considered as a moderate obstruction to flood flow; and if it is higher than 10%, it is considered as a severe obstruction to flood flow.
[0051] The present invention can provide an accurate assessment of the degree of obstruction to flood flow by calculating parameters such as the projected area, density coefficient and water-blocking area of the obstruction, provide a quantitative data basis for river managers, and achieve scientific planning and reasonable analysis when studying and judging the problems of obstruction to flood flow within the scope of river management.
[0052] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.
Claims
1. A method for calculating the degree of obstruction to flood discharge within a river management area, characterized in that: include: Step 1: Obtain the management scope of the target river; Step 2: Calculate the projected area of obstacles parallel to the water flow direction within the management scope of the target river; Step 3: Determine the density coefficient according to the type of obstacle; Step 4: Determine the water blocking area using the density coefficient and the projection area; Step 5: Obtain the cross-sectional area of the river channel and the area occupied by the obstacles perpendicular to the water flow direction; Step 6: Take n cross sections at different locations of the barrier and measure the water depth occupied by the barrier at the corresponding cross section and the water depth at the main channel of the river under the corresponding flood control standard; Step 7: Construct a calculation formula for the degree of flood obstruction based on the water depth occupied by the obstruction at the corresponding cross-sectional location, the water depth at the main channel of the river, the water blocking area and the area occupied by the obstruction; Step 8: Use the above-mentioned flood obstruction degree calculation formula to complete the calculation of the flood obstruction degree of the obstacles within the river management scope.
2. A method for calculating the degree of obstruction to flood discharge within a river management area according to claim 1, characterized in that: The types of obstacles include: buildings and objects with dense flow holes or gaps.
3. A method for calculating the degree of obstruction to flood discharge within a river management area according to claim 2, characterized in that: In step 3, when the type of obstacle is a building, the density coefficient ρ is 1; when the type of obstacle is an object with dense flow holes or gaps, the density coefficient ρ = S projection / S contour; wherein S projection is the projection area of the object with dense flow holes or gaps, and S contour is the contour area of the object with dense flow holes or gaps.
4. A method for calculating the degree of obstruction to flood discharge within a river management area according to claim 3, characterized in that: In step 4, when ρ<0.5, Swater blocking=Sprojection; when 0.5<ρ<0.75, Swater blocking=1.5Sprojection; when 0.75<ρ<1, Swater blocking=Scontour, and Swater blocking is the water blocking area.
5. A method for calculating the degree of obstruction to flood discharge within a river management area according to claim 4, characterized in that: In step 7, the calculation formula for the degree of flood obstruction is: Among them, X is the value of the degree of obstruction to flood discharge, Swater blocking is the water blocking area, Sriver section is the cross-sectional area of the river, Soccupied area is the land area, Sriver section plane is the plane area of the river section where Soccupied area is located, Hn is the water depth occupied by the obstruction at the nth cross-sectional position, H 主河槽 is the water depth in the main channel of the river at the nth section position.