CN-121997100-A - Overall flood classification method and system based on flood composition and encountering condition

CN121997100ACN 121997100 ACN121997100 ACN 121997100ACN-121997100-A

Abstract

The invention discloses an overall flood classification method and system based on flood composition and encountering conditions, comprising the steps of S1, collecting and arranging overall flood data of a research section, including a research section scene flood process and a corresponding time upstream main flood section flood process, S2, calculating the ratio of different overall flood upstream main flood section flood to different downstream flood time periods, S3, calculating the average ratio of each overall flood upstream main flood section flood to different downstream flood time periods, S4, carrying out primary classification according to the average ratio of different overall flood upstream main flood section flood to different downstream flood time periods, S5, defining flood encountering evaluation indexes, carrying out secondary classification according to the evaluation indexes, and realizing the fine classification of overall flood, and the invention classifies the overall flood, can quantitatively classify the overall flood, and provides support for research such as overall design flood, similar flood identification and the like.

Inventors

ZHOU MAN
ZHANG SONG
YANG XINYUE
REN SHI
Guo lv
GONG WENTING
YANG KUN
QIU HONGYA
WANG ZHENGHUA
HU TING
XU YINSHAN
XIAO YANGFAN
YANG YANFEI
JI GUOLIANG
NIU WENJING

Assignees

中国长江三峡集团有限公司
长江水利委员会水文局

Dates

Publication Date: 20260508
Application Date: 20260129

Claims (10)

1. An overall flood classification method based on flood composition and encounter conditions, comprising: S1, collecting and arranging integral flood data of a research section, wherein the integral flood data comprises a research section field flood process and a corresponding time upstream main water section water supply process; S2, calculating the flood ratio of different integral floods in different periods of time when the flood is taken up by the main water supply section upstream of the flood to the downstream flood; s3, calculating the average ratio of the flood of different periods of the downstream flood of the main water-supply section water supply of the upstream of each integral flood; S4, primarily classifying the floods according to the average ratio of the flood volume of different periods of the floods with different integral floods upstream main water supply sections to the downstream floods; s5, defining flood encountering evaluation indexes, and carrying out secondary classification on the whole flood according to the evaluation indexes to realize fine classification of the whole flood.
2. The overall flood classification method based on flood composition and encountering conditions according to claim 1, wherein S1 specifically is: Collecting and arranging the whole flood data of the research section, wherein the whole flood data comprises the whole flood process flow data Q down,i of the research section, i=1, 2, & gt, N, and the main flood section flow process data Q up,i , i=1, 2, & gt, N, wherein Q down,i is the whole flood water downstream section flow process of the i-th field, Q up,i is the upstream section water inlet process of the whole flood period of the i-th field, and N represents the selected whole flood times.
3. The method of claim 1, wherein S2 is to calculate a flood ratio θ i,n of different periods of time of the i-th integral flood upstream main flood section water filling to the downstream flood.
4. The method for classifying integral floods based on flood composition and encountering conditions according to claim 3, wherein calculating the flood ratio θ i,n of the different periods of flood of the main flood section upstream main flood section of the ith integral flood to the downstream flood is specifically as follows: ; wherein n represents the number of days for calculating the flood of the period, d is a unit for dynamically adjusting the flood duration according to the typical flood duration, T p,i represents the peak current time of the whole flood water section of the ith field, T represents the average propagation time from the upstream main flood section flow to the downstream, and h is a unit.
5. The overall flood classification method based on flood composition and encounter conditions according to claim 4, wherein S3 is: Calculating the average ratio of the flood volume of different periods of the flood of the upstream main flood section of the ith integral flood to the downstream flood The method specifically comprises the following steps: 。
6. The overall flood classification method based on flood composition and encounter conditions according to claim 5, wherein S4 is specifically: the flood is primarily classified according to the average ratio of the flood volume of different periods of the flood volume of the upstream main flood section of the N-field integral flood, wherein the flood volume is calculated by the average ratio of the flood volume of different periods of the downstream flood, and the flood is specifically as follows: ; Wherein, min () represents minimum value, max () represents maximum value, round (, 0) represents rounding operation, and decimal place is reserved as 0; representing an average lower duty cycle limit employed to conduct overall flood classification; The method is characterized by comprising the steps of representing an average upper limit of the duty ratio adopted for overall flood classification, wherein M represents the number of overall flood classification, M represents the serial number of overall flood classification, and I m represents the M-th class of overall flood serial number set.
7. The overall flood classification method based on flood composition and encounter condition according to claim 6, wherein in S5, a flood encounter evaluation index λ is defined, specifically as follows: ; Wherein lambda i represents an index of evaluation of the encounter of the ith field overall flood.
8. The overall flood classification method based on flood composition and encountering conditions of claim 7, wherein in S5, the overall flood is classified secondarily according to the evaluation index, and the implementation of the refined classification of the overall flood is specifically as follows: According to the calculation result of the m-class flood encountering evaluation index, secondarily subdividing the m-class flood, wherein the magnitude of the encountering evaluation index is basically about 1.0, and secondarily classifying the m-class flood by taking 0.05 as a step length.
9. The overall flood classification method based on flood composition and encountering conditions as claimed in claim 8, wherein the specific process of secondarily classifying the m-th class of flood with a step size of 0.05 is as follows: ; Wherein, the Representing a lower limit of an encounter evaluation index adopted for secondary classification of the m-th type overall flood; The method is characterized by comprising the steps of representing the upper limit of an encountering evaluation index adopted for secondary classification of the m-th type overall flood, wherein K m represents the number of the m-th type overall flood secondary classification, K represents the sequence number of the m-th type overall flood secondary classification, and I m,k represents the set of the sequence numbers of the K-th type overall design flood after classification according to the encountering evaluation index in the m-th type overall flood.
10. An overall flood classification system based on flood composition and encounter conditions, comprising at least one processor and a memory communicatively coupled to at least one of the processors, wherein the memory stores instructions for execution by the processor to implement an overall flood classification method based on flood composition and encounter conditions as claimed in any one of claims 1 to 9.

Description

Overall flood classification method and system based on flood composition and encountering condition Technical Field The invention relates to the technical field of hydrologic analysis, in particular to an integral flood classification method and system based on flood composition and encountering conditions. Background Flood classification research is basic work of hydrologic analysis research, not only relates to scientific design of flood control engineering, but also provides reference for searching similar flood, and can directly influence flood control scheduling strategy formulation. At present, scholars at home and abroad develop a great deal of research on flood classification, and the flood classification has evolved from early single phenomenon description to a multi-dimensional comprehensive system. The main current classification framework is mainly based on three core dimensions, namely, a direct reason (such as storm, snow melting, ice slush and the like) formed according to flood, a space-time characteristic (such as occurrence region, seasonal distribution and evolution process) of flood, and an intensity index (such as reproduction period, flood peak flow and flooding range) of flood. The multi-angle classification system enables people to more comprehensively know flood characteristics, and provides systematic scientific basis for flood control and disaster reduction. With the development of information technology, data-driven intelligent classification methods are gradually innovating traditional flood classification research. The method builds an automatic classification model by analyzing multi-source hydrologic data and utilizing a machine learning algorithm, so that objectivity and accuracy of flood classification (including a cluster analysis algorithm, multi-source data fusion classification and the like) are improved. The method is mainly focused on analysis and classification of single-section flood characteristics, is lack of research on an upstream and downstream integral flood classification method, is mainly only considered on flood composition or qualitative consideration on flood encountering conditions, and is difficult to quantitatively refine and classify integral flood. Disclosure of Invention The invention aims to overcome the defects and provide an overall flood classification method and system based on flood composition and encountering conditions, which are used for classifying overall flood, quantitatively and finely classifying the overall flood at the upstream and downstream, and providing basic support for researches such as overall design flood, similar flood identification and the like. In order to solve the technical problems, the technical scheme adopted by the invention is that the integral flood classification method based on flood composition and encountering conditions comprises the following steps: S1, collecting and arranging integral flood data of a research section, wherein the integral flood data comprises a research section field flood process and a corresponding time upstream main water section water supply process; S2, calculating the flood ratio of different integral floods in different periods of time when the flood is taken up by the main water supply section upstream of the flood to the downstream flood; s3, calculating the average ratio of the flood of different periods of the downstream flood of the main water-supply section water supply of the upstream of each integral flood; S4, primarily classifying the floods according to the average ratio of the flood volume of different periods of the floods with different integral floods upstream main water supply sections to the downstream floods; s5, defining flood encountering evaluation indexes, and carrying out secondary classification on the whole flood according to the evaluation indexes to realize fine classification of the whole flood. Preferably, the S1 specifically is: Collecting and arranging the whole flood data of the research section, wherein the whole flood data comprises the whole flood process flow data Q down,i of the research section, i=1, 2, & gt, N, and the main flood section flow process data Q up,i, i=1, 2, & gt, N, wherein Q down,i is the whole flood water downstream section flow process of the i-th field, Q up,i is the upstream section water inlet process of the whole flood period of the i-th field, and N represents the selected whole flood times. Preferably, S2 is that the flood ratio theta i,n of different periods of time of the flood with the upstream main water supply section of the integral flood of the ith field occupying the downstream flood is calculated. More preferably, calculating the flood ratio theta i,n of different periods of time of the i-th integral flood upstream main flood section incoming water to the downstream flood is specifically as follows: ; wherein n represents the number of days for calculating the flood of the period, d is a unit for dynamically a