Time of Concentration Providing Method for Obtaining Peak Discharge Rate in Forest Catchment And The System

Abstract

The present invention provides a method and system for providing a travel time for calculating a design flood discharge in a forest watershed, comprising the steps of: receiving measured values ​​of the stream length and average slope of the stream in a forest watershed to be measured; calculating the travel time by introducing the received measured values ​​of the stream length and average slope of the stream into the following equation (I); and displaying the calculated travel time on a screen. Formula (I) In the above equation (I), tc represents the travel time (minutes), L represents the mooring length (km), and S represents the average slope of the mooring (km / km).

Description

Technology Field

[0001] The present invention relates to a method and system for providing the time of flow for calculating the design flood discharge in a forest watershed. More specifically, it relates to a new method and system for providing the time of flow for Korean mountainous terrain that can contribute to improving the accuracy and reliability of the design of mountain disaster prevention facilities, such as check dams, by utilizing an improved formula for calculating the time of flow based on actual measurement data of domestic forest watersheds, while simultaneously contributing to the rational construction of mountain disaster prevention facilities and the improvement of construction costs by deriving a design flood discharge suitable for domestic mountainous terrain. Background Technology

[0003] In determining the scale of river embankments, dams, etc., and designing specific structures, the lifespan is an important factor. The lifespan is determined by considering the purpose, importance, and economic feasibility of the structure, and is expressed as the average return period of rainfall corresponding to the design flood discharge.

[0004] Due to the significant difference in the area of ​​the target watersheds between small-scale structures such as embankments and large-scale structures such as multi-purpose dams, there are differences in the calculation methods for design flood discharge. Furthermore, as the risk of disasters, including flash floods in urban areas, has surged recently due to the increased frequency and scale of torrential downpours, public interest in the proper design and construction of disaster prevention facilities is growing.

[0005] Time of runoff refers to the time it takes for rainwater to reach the outlet from the uppermost part of a watershed, and it is a factor that significantly influences the calculation of design flood discharge for mountain disaster prevention facilities, such as check dams. Currently, the *Erosion Control Technology Manual* presents four empirical formulas proposed abroad for calculating the time of runoff; however, verification of their applicability to domestic forest watersheds is insufficient, necessitating the development of a new model suited to domestic conditions. [Prior Art Literature] 1. Cho Hwa-taek et al. (Dec. 2014), Revised Erosion Control Technology Manual (Revised 3rd Edition), Landslide Prevention Division, Korea Forest Service, p. 257. 2. Seo Sang-won et al. A Study on the Calculation of Time of Flood Arrival in Design Flood Discharge Calculation for Small-Scale Watersheds, Yusin Technology Bulletin No. 24, (Dec. 31, 2017). 3. Japanese Patent Publication No. JP2019-045290 (March 22, 2019) 4. Registered Patent Publication No. 10-2009373 (August 12, 2019) The problem to be solved

[0007] The present invention is proposed to solve the problems of the aforementioned conventional technology, and its purpose is to provide a new Korean mountainous terrain type flow time calculation system that enhances the accuracy and reliability of the design of mountain disaster prevention facilities, such as check dams, by utilizing an improved flow time calculation formula based on actual measurement data of domestic forest watersheds, and simultaneously contributes to the rational construction of mountain disaster prevention facilities and the improvement of construction cost appropriateness by deriving a design flood discharge suitable for domestic mountainous terrain.

[0008] The problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below. means of solving the problem

[0010] The technical problem of the present invention as described above is achieved by the following means.

[0011] (1) A step of receiving a measurement of the stream length and average slope of the stream of a forest basin to be measured; a step of calculating the time of flow by introducing the received measurement of the stream length and average slope of the stream into the following equation (I); and a step of displaying the calculated time of flow of the forest basin on a screen.

[0012] Formula (I)

[0013] In the above equation (Ⅰ), t c represents the travel time (minutes), L represents the mooring length (km), and S represents the average slope of the mooring (km / km).

[0015] (2) In the above (1),

[0016] A method for providing a travel time for calculating a design flood discharge in a forest watershed, characterized by receiving measured values ​​of stream length and average slope of the stream measured by the client through a network and transmitting the calculated travel time to the client through a network for the calculation of the travel time above.

[0018] (3) In the above (1),

[0019] A method for providing the time of travel for calculating the design flood discharge of a forest basin, characterized in that the client is a mobile terminal.

[0021] (4) A measurement receiving unit that receives the measurement values ​​of the stream length and average slope of the stream in the forest watershed to be measured;

[0022] A time-to-go calculation unit that calculates the time-to-go by introducing the received mooring extension and average slope measurements into the following equation (I); and

[0023] A system for providing travel time for calculating design flood discharge in a forest basin, comprising a result value display unit that displays the travel time of the forest basin calculated above on a screen.

[0024] Formula (I)

[0025] In the above equation (Ⅰ), t c represents the travel time (minutes), L represents the mooring length (km), and S represents the average slope of the mooring (km / km).

[0027] (5) In the above (4),

[0028] A system for providing travel time for calculating design flood discharge in a forest watershed, characterized by receiving measured values ​​of stream length and average slope of the stream measured by the client via a network for the calculation of the travel time above, and transmitting the calculated travel time to the client via a network.

[0030] (6) In the above (5),

[0031] A system for providing time of flow for calculating design flood discharge in a forest watershed, characterized in that the client is a mobile terminal.

[0033] (7) In the above (4), the above formula (I) is

[0034] Correlation between the measured stream length and the actual time of flow of the forest watershed to be measured; and

[0035] A system for providing time of flow for calculating design flood discharge in a forest watershed, characterized by being derived from the correlation between the measured value of the average slope of a stream in a forest watershed to be measured and the actual time of flow.

[0037] (8) In the above (7),

[0038] A system for providing time of flow for calculating design flood discharge in a forest watershed, characterized in that the correlation equation between the measured stream length and the actual time of flow of the forest watershed to be measured is expressed by the following equation (i).

[0039] Equation (i) y=9.5283x+12.768

[0040] The above y = actual travel time value (minutes), and x represents the mooring length (km) measurement value.

[0042] (9) In the above (7),

[0043] A system for providing time of flow for calculating design flood discharge in a forest watershed, characterized in that the correlation equation between the measured value of the average slope of the stream in the forest watershed to be measured and the actual time of flow is expressed by the following equation (ii).

[0044] Equation (ii) y=-24.6ln(x)-3.9644

[0045] The above y = actual travel time value (minutes), and x represents the average slope measurement value (km / km) of the stream.

[0047] (10) A computer-readable recording medium that records a program for executing any one of the methods selected from (1) to (3) above. Effects of the invention

[0049] As described above, the present invention provides a new Korean mountainous terrain type flow time calculation system that enhances the accuracy and reliability of the design of mountain disaster prevention facilities, such as check dams, by utilizing an improved flow time calculation formula based on actual measurement data of domestic forest watersheds, and contributes to the rational construction of mountain disaster prevention facilities and the improvement of construction cost appropriateness by deriving a design flood discharge suitable for domestic mountainous terrain. Brief explanation of the drawing

[0051] FIG. 1 is a configuration diagram of a system for providing a time of flow for calculating a design flood discharge in a forest watershed according to the present invention. FIG. 2 is a flowchart of the procedure for providing the time of flow for calculating the design flood discharge of a forest watershed according to the present invention. FIG. 3 is a distribution map of forest watersheds subject to travel time analysis in an embodiment of the present invention. FIG. 4 is a correlation diagram between mooring extension and arrival time in an embodiment of the present invention. FIG. 5 is a correlation diagram between the average slope of the mooring and the travel time in an embodiment of the present invention. Figure 6 is a prediction evaluation result diagram according to the conventional technology and the method of calculating the delivery time. Specific details for implementing the invention

[0052] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiment in which the present invention may be practiced. The following detailed description includes specific details to provide a complete understanding of the present invention. However, those skilled in the art will know that the present invention may be practiced without such specific details.

[0053] In some cases, to avoid obscuring the concept of the present invention, known structures and devices may be omitted or illustrated in the form of a block diagram focusing on the core functions of each structure and device.

[0054] Throughout the specification, when a part is described as "comprising" or "including" a component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "...part," "...unit," and "module" as used in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware, software, or a combination of hardware and software. Additionally, "one (a or an)," "one," "the," and similar related terms may be used in the context describing the invention (particularly in the context of the following claims) to include both singular and plural forms, unless otherwise indicated in the specification or clearly contradicted by the context.

[0055] In describing the embodiments of the present invention, specific descriptions of known functions or configurations will be omitted if it is determined that such detailed descriptions could unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined in consideration of their functions in the embodiments of the present invention, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, such definitions should be based on the content throughout this specification.

[0056] The contents of the present invention will be explained in more detail below with reference to the drawings.

[0057] In the present invention, the time of arrival refers to the maximum time required for rainwater falling at the furthest point (hydrological origin) within the basin to reach the outlet (inspection point) of the basin. In the present invention, the stream length refers to the length of the waterway from the upstream point where the stream begins to the downstream outlet. In the present invention, the average slope of the stream refers to the ratio of the elevation difference (head) to the total length of the stream. As shown in FIG. 1, the time of arrival provision system (100) for calculating the design flood volume of a forest basin according to the present invention includes a measurement value receiving unit (101), a time of arrival calculation unit (102), and a result value display unit (103).

[0058] In addition, the method for providing the time of flow for calculating the design flood volume of a forest basin according to the present invention includes, as illustrated in FIG. 2, a step of receiving the measured values ​​of the stream length and the average slope of the stream of the forest basin to be measured (S201), a step of calculating the time of flow by introducing the received measured values ​​of the stream length and the average slope of the stream into the following equation (I) (S202), and a step of displaying the calculated time of flow of the forest basin on a screen (S203).

[0059] Formula (I)

[0060] In the above equation (Ⅰ), t crepresents the travel time (minutes), L represents the mooring length (km), and S represents the average slope of the mooring (km / km).

[0061] The measurement value receiving unit (101) receives the measurement values ​​of the stream length and average slope of the stream in the forest basin to be measured. At this time, the measurement values ​​of the stream length and average slope of the stream are preferably values ​​received from a client, and the client may be a mobile terminal capable of inputting values ​​measured in the forest basin in real time and transmitting them through a network.

[0062] The above-mentioned mooring time calculation unit (102) calculates the mooring time by introducing the received mooring extension and the measured average slope of the mooring into the following equation (I).

[0063] Formula (I)

[0064] In the above equation (Ⅰ), t c represents the travel time (minutes), L represents the mooring length (km), and S represents the average slope of the mooring (km / km).

[0065] The above equation (I) is derived from the correlation between the measured value of the stream length of the forest watershed to be measured and the actual value of the time of flow, and the correlation between the measured value of the average slope of the stream of the forest watershed to be measured and the actual value of the time of flow.

[0066] In the embodiment of the present invention, as shown in FIG. 3, 40 domestic forest watersheds were selected for analysis, and preferably, as shown in FIG. 4, a positive correlation was obtained between the measured stream length and the actual flow time of the forest watershed to be measured.

[0067] This can be expressed as a function by the following equation (i).

[0068] Equation (i) y=9.5283x+12.768

[0069] The above y = actual travel time value (minutes), and x represents the mooring length (km) measurement value.

[0070] In addition, the correlation between the measured average slope of the stream in the forest watershed to be measured and the actual time of flow was found to be negative, as shown in Figure 5.

[0071] Likewise, this can be expressed as a function by the following equation (ii).

[0072] Equation (ii) y=-24.6ln(x)-3.9644

[0073] The above y = actual travel time value (minutes), and x represents the average slope measurement value (km / km) of the stream.

[0074] The result display unit (103) transmits and displays the calculated delivery time to the requesting client terminal by introducing the measurement value into Equation (I) as described above.

[0075] The results of evaluating the travel time prediction by comparing the system for providing travel time for calculating design flood discharge in a forest watershed according to the present invention with various calculation methods that have been used in the past are shown in Fig. 6. According to the results of the prediction evaluation, it was confirmed that the case according to the present invention is the most superior, as it is closest to a 1:1 line for domestic mountainous areas.

[0077] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

Claim 1 A method for providing a travel time for calculating a design flood discharge in a forest basin, comprising: a step in which a measurement value receiving unit receives a measurement value of the stream length and the average slope of the stream in a forest basin to be measured; a step in which a travel time calculation unit calculates the travel time by introducing the received measurement values ​​of the stream length and the average slope of the stream into the following equation (I); and a step in which a result value displaying unit displays the calculated travel time of the forest basin on a screen, wherein the following equation (I) is derived from the correlation between the measurement value of the stream length of the forest basin to be measured and the actual travel time value; and the correlation between the measurement value of the average slope of the stream of the forest basin to be measured and the actual travel time value, wherein the correlation equation between the measurement value of the stream length of the forest basin to be measured and the actual travel time value is expressed as the following equation (i), and the correlation equation between the measurement value of the average slope of the stream of the forest basin to be measured and the actual travel time value is expressed as the following equation (ii). In the above equation (Ⅰ), t c ε represents the travel time (min), L represents the mooring length (km), and S represents the average slope of the mooring (km / km). Equation (i) y = 9.5283x + 12.768, where y = the measured travel time (min) and x represents the measured mooring length (km). Equation (ii) y = -24.6ln(x) - 3.9644, where y = the measured travel time (min) and x represents the measured average slope of the mooring (km / km). Claim 2 A method for providing a travel time for calculating design flood discharge in a forest watershed, wherein, in claim 1, the calculation of the travel time is characterized by receiving measured values ​​of the stream length and average slope of the stream measured by the client through a network, and transmitting the calculated travel time to the client through a network. Claim 3 A method for providing a time of flow for calculating a design flood discharge in a forest basin, characterized in that, in claim 1, the client is a mobile terminal. Claim 4 A system for providing a travel time for calculating a design flood discharge in a forest basin, comprising: a measurement value receiving unit that receives the measurement values ​​of the stream length and average slope of the stream in a forest basin to be measured; a travel time calculation unit that calculates the travel time by introducing the received measurement values ​​of the stream length and average slope of the stream into the following equation (I); and a result value display unit that displays the calculated travel time of the forest basin on a screen, wherein the following equation (I) is derived from the correlation between the measurement value of the stream length of the forest basin to be measured and the actual travel time value; and the correlation between the measurement value of the average slope of the stream in the forest basin to be measured and the actual travel time value, wherein the correlation equation between the measurement value of the stream length of the forest basin to be measured and the actual travel time value is expressed as the following equation (i), and the correlation equation between the measurement value of the average slope of the stream in the forest basin to be measured and the actual travel time value is expressed as the following equation (ii). In the above equation (Ⅰ), t c ε represents the travel time (min), L represents the mooring length (km), and S represents the average slope of the mooring (km / km). Equation (i) y = 9.5283x + 12.768, where y = the measured travel time (min) and x represents the measured mooring length (km). Equation (ii) y = -24.6ln(x) - 3.9644, where y = the measured travel time (min) and x represents the measured average slope of the mooring (km / km). Claim 5 A system for providing travel time for calculating design flood discharge in a forest watershed, characterized in that, in claim 4, the calculation of the travel time is input via a network the measured values ​​of the stream length and average slope of the stream measured by the client, and the calculated travel time is transmitted to the client via a network. Claim 6 A system for providing delivery time for calculating design flood discharge in a forest basin, characterized in that, in claim 5, the client is a mobile terminal. Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 A computer-readable recording medium storing a program that executes the method of any one of claims 1 to 3.

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