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首页> 外文会议>Dam safty 2003 >SITE-SPECIFIC PROBABLE MAXIMUM PRECIPITATION (PMP) FOR THE CHERRY CREEK DRAINAGE BASIN, COLORADO
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SITE-SPECIFIC PROBABLE MAXIMUM PRECIPITATION (PMP) FOR THE CHERRY CREEK DRAINAGE BASIN, COLORADO

机译：科罗拉多州樱桃溪流域的站点特定最大降水量（PMP）

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摘要

Applied Weather Associates has completed a site-specific probable maximumrnprecipitation (PMP) for the Cherry Creek drainage basin south of Denver, Colorado. Thisrnproject was initiated by concern about the magnitude of the probable maximum flood (PMF)rncalculated by the US Army Corps of Engineers using a site-specific PMP study provided by thernNational Weather Service. The site-specific PMP study was supported by the Colorado WaterrnConservation Board (CWCB) of the Colorado Department of Natural Resources and four localrncommunities.rnA comprehensive study has been completed that included historically accepted methodsrnand techniques of extreme storm identification, maximization and transpositioning. Ofrnparticular significance is the effect of the Palmer Divide. Sensitivity analyses were completedrnfor key meteorological parameters to quantify the influence of each parameter on the PMPrncomputations. The ESRI ArcView GIS was used extensively for storm analyses and inrnparticular, for terrain slope and aspect evaluations.rnTechniques used by the National Weather Service (NWS) in their site-specific PMPrnstudy for Cherry Creek were evaluated and some were found to be inappropriate for the sitespecificrncharacteristics of the Cherry Creek basin. The NWS approach is to start with therngeneralized HMR results and apply modifications to make the values site-specific. The currentrnstudy used the approach of storm maximization and transposition to the basin location torncompute site-specific PMP values for the Cherry Creek basin.rnThree factors appear to primarily account for the differences between the NWS studyrnand the current study. These are moisture depletion by upwind barriers, area size adjustmentsrnand orographic adjustments.rnThis study computed a 72-hour site-specific basin average PMP value for the 386 squarernmile Cherry Creek basin of 15.4 inches. Compared with the NWS site-specific basin averagernvalue of 24.7 inches, the site-specific PMP study provides a 38% reduction in the basin averagernPMP value.
机译：Applied Weather Associates已为科罗拉多州丹佛市以南的Cherry Creek流域完成了针对特定地点的可能最大降水量（PMP）。该项目是由对美国陆军工程兵利用美国国家气象局提供的针对特定地点的PMP研究计算出的最大可能洪水（PMF）大小的担忧而发起的。特定地点的PMP研究得到了科罗拉多州自然资源部科罗拉多州水资源保护委员会（CWCB）和四个地方社区的支持。已经完成了一项综合研究，其中包括历史上公认的极端风暴识别，最大化和转置方法和技术。特别重要的是帕尔默鸿沟的影响。完成了关键气象参数的敏感性分析，以量化每个参数对PMPrn计算的影响。 ESRI ArcView GIS被广泛用于暴风雨分析和特别是地形坡度和坡向评估。美国国家气象局（NWS）在针对樱桃溪的特定于站点的PMP研究中对技术进行了评估，发现其中一些不适用于切里克里克盆地的特定地点特征。 NWS方法是从广义HMR结果开始，然后进行修改以使值特定于站点。当前的研究使用风暴最大化和转置到盆地位置的方法来计算Cherry Creek盆地的特定地点PMP值。似乎有三个因素可以解释NWS研究与当前研究之间的差异。这些是逆风屏障，面积大小调整和地形调整造成的水分消耗。这项研究计算了386平方英里的Cherry Creek盆地15.4英寸的72小时特定地点的盆地平均PMP值。与NWS特定地点的盆地平均值24.7英寸相比，特定地点的PMP研究使盆地平均值PMP值降低了38％。

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  • 来源
    《Dam safty 2003》|2003年|1-10|共10页
  • 会议地点 Minneapolis MN(US)
  • 作者

    Ed Tomlinson; Ross Williams; Larry Lang;

  • 作者单位

    Applied Weather Associates, Monument, Colorado;

    Applied Weather Associates, Monument, Colorado;

    Colorado Water Conservation Board, Denver, Colorado;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 挡水坝;
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