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Climatological characterization of wind and snowfall in Minnesota and assessing the impacts of living snow fences.

机译:明尼苏达州风和降雪的气候学特征,并评估活动雪栅栏的影响。

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Blowing and drifting snow on roadways is a common occurrence in Minnesota due to the topographic, vegetative, and winter climate characteristics of this area. Through proper road design and the use of snow fences this problem can be alleviated, however snowfall and wind climatological information must first be analyzed. Archived climatological records for locations in Minnesota were recently compiled. Snowfall time series data show a statistically significant increase of 28cm in the annual total since 1890. The increase is shown to occur for November--December while February and March show a decrease. This increase is largely due to an increase in the frequency of snow events less than 10cm.; Wind data from federal observing sites in Minnesota show a correlation to landscape variability, with a high frequency of higher wind speeds in western and southern Minnesota. A snow relocation factor needed to quantify seasonal snow transport was calculated and shows a strong dependence on the wind speed distribution.; A case study of the 2000--01 winter season allowed for examination of snow storage and agricultural implications of three living snow fence designs in southern Minnesota (two 8-row strips of corn, twin-row honeysuckle, single-row honeysuckle/red cedar). For a winter with high seasonal snowfall and spring rainfall, results of snow storage and modeled seasonal snow transport show good agreement for the two corn row strips. However, snow storage totaled approximately 50% of the modeled snow transport for the honeysuckle fence designs, which appeared to reach storage capacity prior to the end of the snow season. A key factor is the absence of a bottom gap, which promotes leeward displacement of the downwind drift and prevents snow deposition on the fence.; Soil temperature and frost depth data show a moderation in temperatures and a decrease in freezing depth with an increase in associated snowpack depth. Post-season soil moisture shows no significant variability with respect to over-winter snowpack due to the anomalous rainfall received during and after snowmelt. Finally, crop yield samples show a 6%--36% reduction adjacent to the fence, but also show a relatively quick recovery.
机译:由于该地区的地形,植物和冬季气候特征,在道路上吹雪和飘雪是明尼苏达州的常见现象。通过适当的道路设计和使用雪栅栏,可以缓解此问题,但是必须首先分析降雪和风的气候信息。明尼苏达州各地的气候资料记录已于最近汇编。降雪时间序列数据显示,自1890年以来,每年的降雨量总计有统计上的显着增加,增加了28厘米。该增加显示为11月至12月,而2月和3月则有所减少。这种增加主要是由于降雪事件的频率增加不到10厘米。来自明尼苏达州联邦观测站的风数据显示与景观变异性相关,明尼苏达州西部和南部的风速较高频率较高。计算了量化季节性积雪运输所需的积雪重置因子,该因子显示出对风速分布的强烈依赖性。以2000--01冬季的案例研究为例,考察了明尼苏达州南部三种活雪围栏设计的储雪量及其对农业的影响(两条8行玉米条,双行金银花,单行金银花/红雪松) )。对于一个季节性降雪量大,春季降雨多的冬季,积雪的结果和模拟的季节性积雪运输结果表明,这两个玉米行条带具有良好的一致性。但是,金银花篱笆设计中的积雪总量约为模型积雪运输量的50%,这似乎在积雪季节结束之前达到了蓄积能力。关键因素是没有底部间隙,底部间隙会促进顺风方向的下风向位移并防止积雪在围栏上。土壤温度和霜冻深度数据显示温度适中,随着积雪深度的增加,冰冻深度降低。由于融雪期间和融雪后收到异常降雨,季后土壤湿度相对于冬季积雪没有显着变化。最后,农作物产量样本显示出围栏附近减少了6%-36%,但恢复也相对较快。

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