利用泰山CD雷达和济南SA雷达探测资料,对2016年6月13—14日和9月11日4个长寿命强冰雹风暴参数进行了对比分析。结果表明,4个强冰雹风暴成熟阶段济南SA雷达探测到的DBZM值都在60 d BZ以上,C-VIL值基本在50 kg·m^(-2)以上,TOP值基本...利用泰山CD雷达和济南SA雷达探测资料,对2016年6月13—14日和9月11日4个长寿命强冰雹风暴参数进行了对比分析。结果表明,4个强冰雹风暴成熟阶段济南SA雷达探测到的DBZM值都在60 d BZ以上,C-VIL值基本在50 kg·m^(-2)以上,TOP值基本在9 km以上,0613平阴风暴和0614章丘风暴不仅持续时间相差不多,而且DBZM、C-VIL、TOP值基本相近,DBZM基本在64d BZ以上,最大达到70 d BZ,C-VIL基本在60 kg·m^(-2)以上,最大在80 kg·m^(-2)左右,TOP值基本在10.5 km以上;SA雷达和CD雷达监测到的风暴参数有明显差异,SA雷达观测到的强风暴DBZM、C-VIL和TOP值明显大于CD雷达观测到的值,特别是DBZM和C-VIL在风暴强盛阶段差异更加明显,风暴强盛阶段,SA和CD雷达观测到的0613阳谷风暴、0613平阴风暴、0614章丘风暴和0911高青风暴的DBZM平均差值分别为10 d BZ、10 d BZ、9 d BZ和7 d BZ,C-VIL平均差值分别为30kg·m^(-2)、28 kg·m^(-2)、29 kg·m^(-2)和28 kg·m^(-2)。造成强风暴参数差异性的主要因素是大的粒子或者强降雨对CD雷达电磁波强烈衰减,同时泰山CD雷达的地理环境和观测模式也是原因之一。展开更多
This paper presents a new method to determine parameters in the nonlinear mathematical model of the urban rainfall intensity formula. The method transforms the nonlinear equation into a linear one, and incorperates a ...This paper presents a new method to determine parameters in the nonlinear mathematical model of the urban rainfall intensity formula. The method transforms the nonlinear equation into a linear one, and incorperates a damping factor and a step factor to improve the precision of the calculated results. It works out the parameters based on given rainstorm intensity, period of the recurrence of rainstorm and lasting time of the rainfall. The results turns out to have the smallest residual error compared with those obtained by several other methods and satisfy the related standard. The method proves of fast convergence, desirable generality, stability and accuracy, which overcomes the defects of other existing numeral methods.展开更多
Analyzed the selected raw coal nature and forecasted the number quality of its separated product. Considering each product＇s density, volume, and suspending liquid assignment, combining the separating mechanism of th...Analyzed the selected raw coal nature and forecasted the number quality of its separated product. Considering each product＇s density, volume, and suspending liquid assignment, combining the separating mechanism of the cyclone and the rela- tive formulas obtained from scientific experimentation and practice, the structure parameter was determined by calculation. This provides a more scientific reasonable method for determining the structure parameter of the unpressurized feeding three-product heavy-medium cyclone.展开更多
文摘利用泰山CD雷达和济南SA雷达探测资料,对2016年6月13—14日和9月11日4个长寿命强冰雹风暴参数进行了对比分析。结果表明,4个强冰雹风暴成熟阶段济南SA雷达探测到的DBZM值都在60 d BZ以上,C-VIL值基本在50 kg·m^(-2)以上,TOP值基本在9 km以上,0613平阴风暴和0614章丘风暴不仅持续时间相差不多,而且DBZM、C-VIL、TOP值基本相近,DBZM基本在64d BZ以上,最大达到70 d BZ,C-VIL基本在60 kg·m^(-2)以上,最大在80 kg·m^(-2)左右,TOP值基本在10.5 km以上;SA雷达和CD雷达监测到的风暴参数有明显差异,SA雷达观测到的强风暴DBZM、C-VIL和TOP值明显大于CD雷达观测到的值,特别是DBZM和C-VIL在风暴强盛阶段差异更加明显,风暴强盛阶段,SA和CD雷达观测到的0613阳谷风暴、0613平阴风暴、0614章丘风暴和0911高青风暴的DBZM平均差值分别为10 d BZ、10 d BZ、9 d BZ和7 d BZ,C-VIL平均差值分别为30kg·m^(-2)、28 kg·m^(-2)、29 kg·m^(-2)和28 kg·m^(-2)。造成强风暴参数差异性的主要因素是大的粒子或者强降雨对CD雷达电磁波强烈衰减,同时泰山CD雷达的地理环境和观测模式也是原因之一。
文摘This paper presents a new method to determine parameters in the nonlinear mathematical model of the urban rainfall intensity formula. The method transforms the nonlinear equation into a linear one, and incorperates a damping factor and a step factor to improve the precision of the calculated results. It works out the parameters based on given rainstorm intensity, period of the recurrence of rainstorm and lasting time of the rainfall. The results turns out to have the smallest residual error compared with those obtained by several other methods and satisfy the related standard. The method proves of fast convergence, desirable generality, stability and accuracy, which overcomes the defects of other existing numeral methods.
文摘Analyzed the selected raw coal nature and forecasted the number quality of its separated product. Considering each product＇s density, volume, and suspending liquid assignment, combining the separating mechanism of the cyclone and the rela- tive formulas obtained from scientific experimentation and practice, the structure parameter was determined by calculation. This provides a more scientific reasonable method for determining the structure parameter of the unpressurized feeding three-product heavy-medium cyclone.
