小流域雨型對山洪災(zāi)害臨界雨量的影響研究
本文選題:山洪災(zāi)害 + 暴雨時空特征; 參考:《鄭州大學(xué)》2017年碩士論文
【摘要】:目前,山洪預(yù)警系統(tǒng)已經(jīng)廣泛應(yīng)用到我國大部分省(市),臨界雨量是進(jìn)行山洪預(yù)警的重要指標(biāo)。在山洪災(zāi)害分析計算中,設(shè)計雨型是產(chǎn)匯流計算中常用參數(shù),使用不同的雨型,將明顯影響到設(shè)計洪峰等成果,導(dǎo)致臨界雨量成果產(chǎn)生變化,F(xiàn)行分析計算中,設(shè)計雨型常使用圖集、水文手冊中根據(jù)大中流域資料推求的雨型,該雨型能否適應(yīng)于小流域推求臨界雨量?此外,全球氣候不斷變暖,極端暴雨事件常有發(fā)生,圖集雨型推求的臨界雨量能否滿足極端降雨形成災(zāi)害的預(yù)警精度要求?為解決以上問題,論文以河南省裴河小流域典型防災(zāi)對象為實例,根據(jù)小流域暴雨洪水資料,在深入分析小流域綜合雨型和產(chǎn)匯流方案合理性的基礎(chǔ)上,開展不同雨型對山洪災(zāi)害臨界雨量的影響研究,對指導(dǎo)山洪災(zāi)害實時預(yù)警具有重要意義。論文主要研究內(nèi)容和成果如下:(1)根據(jù)河南省新縣裴河水文站32年實測降雨資料,詳細(xì)分析了該水文站所在小流域暴雨時空分布特征。結(jié)果表明,研究區(qū)小流域?qū)嶋H降雨過程常出現(xiàn)雙峰雨型降雨,與《河南省中小流域設(shè)計暴雨洪水圖集》(84圖集)推薦的單峰雨型存在差異。(2)根據(jù)長期實測降雨資料,采用PC雨型法和同頻率分析雨型法,推求了裴河小流域常見的短歷時設(shè)計雨型,并根據(jù)當(dāng)?shù)亟跇O端實測降雨資料,推求極端降雨雨型。結(jié)果表明,推求的雨型為雙峰雨型,與該小流域暴雨時空分布特征相似,PC法推求的雨型,最大雨峰靠后,同頻率分析法及近期極端暴雨推求的雨型,最大雨峰靠前。(3)根據(jù)裴河流域長系列降雨洪水配套資料,對本文設(shè)計洪水和臨界雨量推求中所采用的產(chǎn)匯流計算方法及參數(shù)進(jìn)行了合理性分析。結(jié)果表明,《河南省中小流域設(shè)計暴雨洪水圖集》(84圖集)中山丘區(qū)降雨徑流關(guān)系曲線Ⅰ線適用于研究區(qū)小流域;采用國家下發(fā)的工作地圖中提供的標(biāo)準(zhǔn)化單位線進(jìn)行匯流計算,與實際洪水的洪峰較為接近,該產(chǎn)匯流方案適用于本研究區(qū)。(4)采用降雨徑流關(guān)系曲線插值法推求不同雨型對應(yīng)的臨界雨量,分析雨型對臨界雨量的影響程度。結(jié)果表明,預(yù)警時段為1h和2h推算的臨界雨量,由于歷時較短,與圖集中雨型推求的臨界雨量相差不大;預(yù)警時段為3h推算的臨界雨量,與圖集中雨型推求的臨界雨量相差較大,誤差在5%~25%之間;預(yù)警時段為6h的預(yù)警時段,由于出現(xiàn)雙峰雨型,與圖集中雨型推求的臨界雨量具有明顯差別,誤差在10%~50%之間?芍,根據(jù)圖集雨型推求的雨型并不能完全適應(yīng)于小流域,雨型的不同對于臨界雨量具有較大影響,山洪災(zāi)害預(yù)警作業(yè)中,應(yīng)根據(jù)近期天氣預(yù)報信息,預(yù)測可能出現(xiàn)的雨型,在此基礎(chǔ)上,合理選擇預(yù)警指標(biāo),準(zhǔn)確發(fā)布預(yù)警指令。本文的研究內(nèi)容及結(jié)果,可為山洪臨界雨量的計算補充實際及理論研究支撐,使預(yù)警更加精細(xì)化、多樣化,同時對于實際山洪預(yù)警工作具有參考價值。
[Abstract]:At present, mountain flood warning system has been widely used in most provinces (cities and cities) in China, critical rainfall is an important index for early warning of mountain torrents. In the analysis and calculation of mountain torrents, the design rain type is a commonly used parameter in the calculation of runoff yield and confluence. The use of different rain patterns will obviously affect the results of design Hong Feng and lead to the change of critical rainfall results. In the current analysis and calculation, the design rain pattern is often used in the atlas, and the rainfall pattern derived from the data of the large and medium basins in the hydrological manual is suitable for the calculation of critical rainfall in small watersheds. In addition, the global climate is warming and extreme rainstorm events often occur. Can the critical rainfall calculated by atlas can meet the requirement of warning accuracy of extreme rainfall formation disasters? In order to solve the above problems, taking the typical disaster prevention object of Pei River watershed in Henan Province as an example, based on the rainstorm and flood data of small watershed, the rationality of integrated rain pattern and runoff production and confluence scheme of small watershed is deeply analyzed. It is of great significance to study the influence of different rain patterns on the critical rainfall of mountain torrents and to guide the real time early warning of mountain torrents. The main contents and results of this paper are as follows: (1) based on the 32 year rainfall data of Peihe Hydrological Station in Xinxian County, Henan Province, the spatial and temporal distribution characteristics of rainstorm in the small watershed of the hydrologic station are analyzed in detail. The results show that bimodal rainfall often occurs in the actual rainfall process of the small watershed in the study area, which is different from the single peak rain pattern recommended by the "Design rainstorm Flood Atlas of the Middle and small Watershed of Henan Province". By using the PC rain pattern method and the same frequency analysis rain pattern method, the common short-duration design rain patterns in Pei River small watershed are derived, and the extreme rainfall patterns are deduced according to the local extreme rainfall data in the near future. The results show that the rain pattern obtained is bimodal rain pattern, similar to that obtained by PC method, similar to the spatial and temporal distribution characteristics of rainstorm in this small watershed, and the rain pattern calculated by the same frequency analysis method and recent extreme rainstorm is similar to that obtained by PC method. Based on the data of long series rainfall flood in Pei River Basin, the calculation methods and parameters of runoff yield and confluence used in the calculation of design flood and critical rainfall are analyzed. The results show that line I of the rainfall runoff relationship curve in hilly area is suitable for the small watershed in the study area, and the standard unit line provided in the working map issued by the State is used to calculate the confluence. The scheme of runoff yield and confluence is suitable for the study area. (4) using the interpolation method of rainfall runoff relation curve, the critical rainfall corresponding to different rain patterns is calculated, and the influence degree of rain type on critical rainfall is analyzed. The results show that the critical rainfall calculated in the early warning period of 1 h and 2 h has little difference with the critical rainfall calculated in the atlas due to its short duration, and the critical rainfall calculated in the early warning period is 3 h. The difference between the critical rainfall and the rain type in the atlas is quite large, the error is between 5% and 25%, and in the early warning period of 6 h, the critical rainfall is obviously different from the rain type in the atlas because of the bimodal rain type, and the error is between 10% and 50%. It can be concluded that the rain pattern derived from the map set can not be fully adapted to the small watershed, and the different rain patterns have great influence on the critical rainfall. In the early warning operation of mountain torrents, the possible rain patterns should be predicted according to the recent weather forecast information. On this basis, the reasonable selection of early warning indicators, the accurate issuance of early warning instructions. The research contents and results of this paper can supplement the practical and theoretical research support for the calculation of the critical rainfall of mountain torrents, and make the early warning more refined and diversified. At the same time, it has reference value for the actual mountain torrents early warning work.
【學(xué)位授予單位】:鄭州大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P426.616
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