Influence radius of a pumping well is a crucial parameter for hydrogeologists and engineers. Knowing the radius of influence for a designed drawdown enables one to calculate the pumping rate required to layout a proje...Influence radius of a pumping well is a crucial parameter for hydrogeologists and engineers. Knowing the radius of influence for a designed drawdown enables one to calculate the pumping rate required to layout a project foundation that may need lowering of groundwater level to a certain depth due to dewatering operation. In addition, this is important for hydrogeologists to determine ground water contamination flow paths and contributing recharge area for domestic water supply and aquifer management purposes. Empirical formulas that usually neglect vital parameters to determine the influence radius accurately have been traditionally utilized due to lack of adequate methods. In this study, a physically based method, which incorporates aquifer hydraulic gradient for determining the influence radius of a pumping well in steady-state flow condition, was developed. It utilizes Darcy and Dupuit laws to calculate the influence radius, where Darcy’s law and Dupuit equation, in steady-state condition, represent the inflow and the outflow of the pumping well, respectively. In an untraditional manner, this method can be also used to determine aquifer hydraulic conductivity as an alternative to other pumping test methods with high degree of accuracy. The developed method is easy to use;where a simple mathematical calculator may be used to calculate the influence radius and the pumping rate or hydraulic conductivity. By comparing the results from this method with the MODFLOW numerical model outputs with different simulated scenarios, it is realized that this method is much superior and more advantageous than other commonly used empirical methods.展开更多
目的 探讨尺骨茎突骨折与否及其分型对桡骨远端骨折手术的影响。方法 2020年1月~2021年12月在本院治疗的桡骨远端骨折病人92例,根据病人是否合并尺骨茎突骨折以及骨折的Hauck分型标准将其分为非合并组(48例)、合并Ⅰ型组(21例)和合并Ⅱ...目的 探讨尺骨茎突骨折与否及其分型对桡骨远端骨折手术的影响。方法 2020年1月~2021年12月在本院治疗的桡骨远端骨折病人92例,根据病人是否合并尺骨茎突骨折以及骨折的Hauck分型标准将其分为非合并组(48例)、合并Ⅰ型组(21例)和合并Ⅱ型组(23例)。收集病人术前、术后6个月和术后1年的掌倾角、尺偏角、桡骨茎突高度恢复等影像学数据及Gartland-Werly评分、握力、臂肩手功能障碍(disabilities of the arm,shoulder and hand,DASH)评分,比较3组的并发症发生率。结果 3组病人术前掌倾角、尺偏角、桡骨茎突高度和关节面平整度差异无统计学意义(P>0.05),3组病人术后6个月及1年掌倾角、尺偏角、桡骨茎突高度和关节面平整度均有不同程度改善,差异有统计学意义(P<0.05),除术后6个月3组的掌倾角、尺偏角存在差异,其余影像学参数术后6个月及1年差异无统计学意义(P>0.05)。3组病人的术后6个月和1年的Gartland-Werly评分比较差异无统计学意义(P>0.05);3组病人术前握力和DASH评分比较差异无统计学意义(P>0.05),术后6个月及1年,3组病人的握力和DASH评分均有不同程度改善,差异有统计学意义(P<0.05),术后1年,与非合并组和合并Ⅰ型组比,合并Ⅱ型组病人的握力和DASH评分恢复较慢,差异有统计学意义(P<0.05)。3组病人均未发生明显的并发症。结论 合并Ⅱ型尺骨茎突骨折会影响桡骨远端骨折术后疗效,合并Ⅰ型尺骨茎突骨折对腕功能影响较小。展开更多
文摘Influence radius of a pumping well is a crucial parameter for hydrogeologists and engineers. Knowing the radius of influence for a designed drawdown enables one to calculate the pumping rate required to layout a project foundation that may need lowering of groundwater level to a certain depth due to dewatering operation. In addition, this is important for hydrogeologists to determine ground water contamination flow paths and contributing recharge area for domestic water supply and aquifer management purposes. Empirical formulas that usually neglect vital parameters to determine the influence radius accurately have been traditionally utilized due to lack of adequate methods. In this study, a physically based method, which incorporates aquifer hydraulic gradient for determining the influence radius of a pumping well in steady-state flow condition, was developed. It utilizes Darcy and Dupuit laws to calculate the influence radius, where Darcy’s law and Dupuit equation, in steady-state condition, represent the inflow and the outflow of the pumping well, respectively. In an untraditional manner, this method can be also used to determine aquifer hydraulic conductivity as an alternative to other pumping test methods with high degree of accuracy. The developed method is easy to use;where a simple mathematical calculator may be used to calculate the influence radius and the pumping rate or hydraulic conductivity. By comparing the results from this method with the MODFLOW numerical model outputs with different simulated scenarios, it is realized that this method is much superior and more advantageous than other commonly used empirical methods.
文摘目的 探讨尺骨茎突骨折与否及其分型对桡骨远端骨折手术的影响。方法 2020年1月~2021年12月在本院治疗的桡骨远端骨折病人92例,根据病人是否合并尺骨茎突骨折以及骨折的Hauck分型标准将其分为非合并组(48例)、合并Ⅰ型组(21例)和合并Ⅱ型组(23例)。收集病人术前、术后6个月和术后1年的掌倾角、尺偏角、桡骨茎突高度恢复等影像学数据及Gartland-Werly评分、握力、臂肩手功能障碍(disabilities of the arm,shoulder and hand,DASH)评分,比较3组的并发症发生率。结果 3组病人术前掌倾角、尺偏角、桡骨茎突高度和关节面平整度差异无统计学意义(P>0.05),3组病人术后6个月及1年掌倾角、尺偏角、桡骨茎突高度和关节面平整度均有不同程度改善,差异有统计学意义(P<0.05),除术后6个月3组的掌倾角、尺偏角存在差异,其余影像学参数术后6个月及1年差异无统计学意义(P>0.05)。3组病人的术后6个月和1年的Gartland-Werly评分比较差异无统计学意义(P>0.05);3组病人术前握力和DASH评分比较差异无统计学意义(P>0.05),术后6个月及1年,3组病人的握力和DASH评分均有不同程度改善,差异有统计学意义(P<0.05),术后1年,与非合并组和合并Ⅰ型组比,合并Ⅱ型组病人的握力和DASH评分恢复较慢,差异有统计学意义(P<0.05)。3组病人均未发生明显的并发症。结论 合并Ⅱ型尺骨茎突骨折会影响桡骨远端骨折术后疗效,合并Ⅰ型尺骨茎突骨折对腕功能影响较小。
