基于气液两相流模型建立二维数值风浪水槽,采用VOF(Volume of Fluid)模型捕捉自由液面,研究了风作用下规则波在岸礁地形上的水动力特性。将计算结果与实验数据对比,证明了该模型计算风作用下波浪传播的准确性,并进一步分析了不同风速对...基于气液两相流模型建立二维数值风浪水槽,采用VOF(Volume of Fluid)模型捕捉自由液面,研究了风作用下规则波在岸礁地形上的水动力特性。将计算结果与实验数据对比,证明了该模型计算风作用下波浪传播的准确性,并进一步分析了不同风速对规则波在岸礁地形上水动力特性影响。结果表明:有风作用时,破碎区的波峰高于无风作用时,冲泻区的波峰低于无风作用时,在风速0~8 m/s范围内,风的作用不会改变波浪在岸礁地形上的破碎类型,但会导致波浪提前破碎并影响破碎波形态变化过程。风的作用会改变波浪在岸礁地形上传播时各断面水平时均流速沿水深分布结构,并且会导致水气交界面附近水质点的速度增大,影响范围随着风速的增大而增大。展开更多
Plate subduction leads to complex exhumation processes on continents.The Huangling Massif lies at the northern margin of the South China Block.Whether the Huangling Massif was exhumed as a watershed of the middle reac...Plate subduction leads to complex exhumation processes on continents.The Huangling Massif lies at the northern margin of the South China Block.Whether the Huangling Massif was exhumed as a watershed of the middle reaches of the Paleo-Yangtze River during the Mesozoic remains under debate.We examined the exhumation history of the Huangling Massif based on six granite bedrock samples,using apatite fission track(AFT)and apatite and zircon(U-Th)/He(AHe and ZHe)thermochronology.These samples yielded ages of 157–132 Ma(ZHe),119–106 Ma(AFT),and 114–72 Ma(AHe),respectively.Thermal modeling revealed that three phases of rapid cooling occurred during the Late Jurassic–Early Cretaceous,late Early Cretaceous,and Late Cretaceous.These exhumation processes led to the high topographic relief responsible for the emergence of the Huangling Massif.The integrated of our new data with published sedimentological records suggests that the Huangling Massif might have been the watershed of the middle reaches of the Paleo-Yangtze River since the Cretaceous.At that time,the rivers flowed westward into the Sichuan Basin and eastward into the Jianghan Basin.The subduction of the Pacific Plate beneath the Asian continent in the Mesozoic deeply influenced the geomorphic evolution of the South China Block.展开更多
目的探讨关节镜下跖筋膜松解联合跟骨骨刺清除术治疗顽固性跟痛症的临床疗效。方法回顾性分析中山市中医院创伤骨科足踝组2018年4月至2022年6月期间,关节镜下采用跖筋膜松解联合跟骨骨刺清除术治疗顽固性跟痛症的患者30例,其中男8例,女2...目的探讨关节镜下跖筋膜松解联合跟骨骨刺清除术治疗顽固性跟痛症的临床疗效。方法回顾性分析中山市中医院创伤骨科足踝组2018年4月至2022年6月期间,关节镜下采用跖筋膜松解联合跟骨骨刺清除术治疗顽固性跟痛症的患者30例,其中男8例,女22例;年龄43~69岁,平均(54.7±7.9)岁,定期于门诊复诊并完成随访。观察并记录术后相关并发症发生情况并定期复查术侧跟骨侧位X线片判断术侧跟骨骨刺是否复发。通过对比术前、术后1个月、术后3个月及末次随访时患者疼痛视觉模拟评分(visual analogue scale,VAS)、美国足踝外科协会踝-后足(American orthopedic foot and ankle society ankle and hindfoot,AOFAS-AH)评分和跟痛症评分(calcaneodynia score,CS)来评价手术疗效。结论30例患者术后随访时间为12~20个月,平均(16.27±2.32)个月。30例患者术后各观察时间点的VAS评分均低于术前,而AOFAS-AH评分和CS评分均高于术前,手术前后对比差异均有统计学意义(P<0.001)。术后定期复查术侧跟骨侧位X线片示跟骨骨刺均无复发。无一例患者出现血管、神经损伤、术口感染等并发症。结论关节镜下跖筋膜松解联合跟骨骨刺清除术能够显著缓解顽固性跟痛症患者足跟局部疼痛,改善足踝功能,其疗效满意,是一种值得推广的治疗方式。展开更多
文摘基于气液两相流模型建立二维数值风浪水槽,采用VOF(Volume of Fluid)模型捕捉自由液面,研究了风作用下规则波在岸礁地形上的水动力特性。将计算结果与实验数据对比,证明了该模型计算风作用下波浪传播的准确性,并进一步分析了不同风速对规则波在岸礁地形上水动力特性影响。结果表明:有风作用时,破碎区的波峰高于无风作用时,冲泻区的波峰低于无风作用时,在风速0~8 m/s范围内,风的作用不会改变波浪在岸礁地形上的破碎类型,但会导致波浪提前破碎并影响破碎波形态变化过程。风的作用会改变波浪在岸礁地形上传播时各断面水平时均流速沿水深分布结构,并且会导致水气交界面附近水质点的速度增大,影响范围随着风速的增大而增大。
基金financially supported by the National Natural Science Foundation of China(Grant Nos.41671011,41871019,41877292,41972212)Research Foundation of Chutian Scholars Program of Hubei Province(Grant No.8210403)Shanxi Key Research and Development program:Feng Cheng(Grant No.2021SF2-03).
文摘Plate subduction leads to complex exhumation processes on continents.The Huangling Massif lies at the northern margin of the South China Block.Whether the Huangling Massif was exhumed as a watershed of the middle reaches of the Paleo-Yangtze River during the Mesozoic remains under debate.We examined the exhumation history of the Huangling Massif based on six granite bedrock samples,using apatite fission track(AFT)and apatite and zircon(U-Th)/He(AHe and ZHe)thermochronology.These samples yielded ages of 157–132 Ma(ZHe),119–106 Ma(AFT),and 114–72 Ma(AHe),respectively.Thermal modeling revealed that three phases of rapid cooling occurred during the Late Jurassic–Early Cretaceous,late Early Cretaceous,and Late Cretaceous.These exhumation processes led to the high topographic relief responsible for the emergence of the Huangling Massif.The integrated of our new data with published sedimentological records suggests that the Huangling Massif might have been the watershed of the middle reaches of the Paleo-Yangtze River since the Cretaceous.At that time,the rivers flowed westward into the Sichuan Basin and eastward into the Jianghan Basin.The subduction of the Pacific Plate beneath the Asian continent in the Mesozoic deeply influenced the geomorphic evolution of the South China Block.
文摘目的探讨关节镜下跖筋膜松解联合跟骨骨刺清除术治疗顽固性跟痛症的临床疗效。方法回顾性分析中山市中医院创伤骨科足踝组2018年4月至2022年6月期间,关节镜下采用跖筋膜松解联合跟骨骨刺清除术治疗顽固性跟痛症的患者30例,其中男8例,女22例;年龄43~69岁,平均(54.7±7.9)岁,定期于门诊复诊并完成随访。观察并记录术后相关并发症发生情况并定期复查术侧跟骨侧位X线片判断术侧跟骨骨刺是否复发。通过对比术前、术后1个月、术后3个月及末次随访时患者疼痛视觉模拟评分(visual analogue scale,VAS)、美国足踝外科协会踝-后足(American orthopedic foot and ankle society ankle and hindfoot,AOFAS-AH)评分和跟痛症评分(calcaneodynia score,CS)来评价手术疗效。结论30例患者术后随访时间为12~20个月,平均(16.27±2.32)个月。30例患者术后各观察时间点的VAS评分均低于术前,而AOFAS-AH评分和CS评分均高于术前,手术前后对比差异均有统计学意义(P<0.001)。术后定期复查术侧跟骨侧位X线片示跟骨骨刺均无复发。无一例患者出现血管、神经损伤、术口感染等并发症。结论关节镜下跖筋膜松解联合跟骨骨刺清除术能够显著缓解顽固性跟痛症患者足跟局部疼痛,改善足踝功能,其疗效满意,是一种值得推广的治疗方式。
