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A Computational Method for Forecasting Peak Flow of Moraine Lake Outbreak Flood

A peak flow and calculation method technology, which is applied in complex mathematical operations, design optimization/simulation, climate change adaptation, etc., can solve problems such as low applicability and large calculation errors, and achieve the effect of improving scientificity and accuracy

Active Publication Date: 2020-04-14
成都华建地质工程科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the existing peak flow calculation methods are difficult to apply to the case prediction of moraine lake outbursts. It is attributed to different scholars who have obtained different empirical formulas based on different data, and the calculation errors are large and the applicability is low.

Method used

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  • A Computational Method for Forecasting Peak Flow of Moraine Lake Outbreak Flood
  • A Computational Method for Forecasting Peak Flow of Moraine Lake Outbreak Flood
  • A Computational Method for Forecasting Peak Flow of Moraine Lake Outbreak Flood

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Embodiment 1

[0111] Such as figure 1 As shown, the water depth H before the collapse of a moraine lake in southeast Tibet 0 = 15m, the length of the lake area is L = 950m; the length of the saddle of the moraine dam body along the flow direction before the collapse is L = 100m. In July 1988, the moraine lake burst, forming a huge mudslide that swept across villages and farmland in the ditch, blocked the main river, washed away the Sichuan-Tibet highway, and spread to downstream counties, causing traffic jams on the broken road for a year.

[0112] The calculation method proposed by the invention is used to restore and verify events. In addition to the size parameters of the moraine lake and moraine dam, the initial surge height A of the moraine dam is obtained through field measurement and herdsman investigation 0 = 3m; According to the sampling and screening of the moraine dam on site, the separation coefficient C of the moraine dam body composition is obtained u = 3.53. Substituting ...

Embodiment 2

[0118] Such as figure 1 shown. A moraine lake in southeastern Tibet is rectangular in shape, with a length of 1.94 km, a maximum width of 0.63 km, and an average width of 0.50 km. Lake area 0.976km 2 , the average water depth in the lake area is about 36m, and it is estimated that the volume of the lake water reaches 35.71×10 6 m 3 . Once the moraine lake bursts, it will cause extremely serious disasters to the life and property of the Sichuan-Tibet line and towns and villages along the river.

[0119] According to indoor topographic map measurement, on-site survey measurement and moraine dam sampling analysis, five calculation factors are obtained: moraine lake water depth H 0 = 36m, the length of the lake area is L = 1940m, the length of the moraine dam saddle along the water flow direction is L = 182m, and the initial surge height A when reaching the moraine dam 0 =5m, the sorting coefficient C of moraine dam body composition u = 3.53. Substituting 5 calculation par...

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Abstract

The invention discloses a calculation method for predicting moraine lake outburst flood peak flow. The calculation method comprises the following steps that sorting coefficients of initial surge height, moraine lake water depth, moraine lake length, the length of a moraine dam body saddle part in the water flow direction and moraine dam body composition substances are measured; the factors are combined, dimension is eliminated, and multivariate regression equation analysis is conducted on the factors and the peak flow, and influence coefficients of factor formulas are determined; a prediction and calculation formula (shown in the description) of the moraine lake outburst flood peak flow Qm is obtained, wherein Qm represents the moraine lake outburst flood peak flow m3 / s, A0 represents the initial surge height m, Ld represents the length of the moraine dam body saddle part in the water flow direction m, H0 represents the moraine lake water depth m, L represents the moraine lake length m, Cu is a sorting coefficient and represents the uniformity degree of moraine lake dam body composition, and no dimension exists. The scientificity and accuracy of a moraine lake outburst flood peak flow predicting and calculating basis is greatly improved by adopting the method.

Description

technical field [0001] The invention belongs to the field of water conservancy engineering, and in particular relates to a calculation method for predicting the peak flow rate of a moraine lake outburst flood. Background technique [0002] For nearly half a century, with global climate change, moraine lake outbursts have occurred frequently in high mountain areas around the world, causing serious economic losses and casualties, such as the Himalayas, Tianshan Mountains, Alps, Caucasus Mountains, and Cordillera Mountains. and the Scandinavian Mountains. China is one of the countries with many glacial lakes. Moraine lake outbursts mainly occur in the Himalayas in Tibet, and the resulting floods and mudslides have caused serious harm in this area. At the same time, previous scientific researches have found that the glacier avalanche into the lake, causing lake water to surge over the top of the overflow and induce the failure of the moraine dam, is an important cause of the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F17/18
CPCG06F17/18G06F30/20Y02A10/40
Inventor 刘建康张佳佳杨东旭王军朝
Owner 成都华建地质工程科技有限公司
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