Recent research on short-term topographic change in the Yangtze Estuary channel under storm surge conditions is briefly summarized. The mild-slope, Boussinesq and action balance equations are compared and analyzed. Th...Recent research on short-term topographic change in the Yangtze Estuary channel under storm surge conditions is briefly summarized. The mild-slope, Boussinesq and action balance equations are compared and analyzed. The action balance equation, SWAN, was used as a wave numerical model to forecast strong storm waves in the Yangtze Estuary. The spherical coordinate system and source terms used in the equation are described in this paper. The significant wave height and the wave orbital motion velocity near the bottom of the channel during 20 m/s winds in the EES direction were simulated, and the model was calibrated with observation data of winds and waves generated by Tropical Cyclone 9912. The distribution of critical velocity for incipient motion along the bottom was computed according to the threshold velocity formula for bottom sediment. The mechanism of rapid deposition is analyzed based on the difference between the root-mean-square value of the near-bottom wave orbital motion velocity and the bottom critical tractive velocity. The results show that a large amount of bottom sediments from Hengsha Shoal and Jiuduan Shoal are lifted into the water body when 20 m/s wind is blowing in the EES direction. Some of the sediments may enter the channel with the cross-channel current, causing serious rapid deposition. Finally, the tendency of the storm to induce rapid deposition in the Yangtze Estuary channel zone is analyzed.展开更多
慢性炎症性关节炎(chronic inflammatory arthritis,CIA)是风湿免疫性疾病的重要临床表现之一,常导致患者关节疼痛、活动受限,甚至最终关节畸形、失能。CIA的主要特点为慢性进展和反复发作,因此须重视疾病管理,其中护理的作用不可或缺。...慢性炎症性关节炎(chronic inflammatory arthritis,CIA)是风湿免疫性疾病的重要临床表现之一,常导致患者关节疼痛、活动受限,甚至最终关节畸形、失能。CIA的主要特点为慢性进展和反复发作,因此须重视疾病管理,其中护理的作用不可或缺。2012年,欧洲抗风湿病联盟(European League Against Rheumatism,EULAR)在《风湿病年鉴(Annals of the Rheumatic Diseases)》杂志上发布了CIA护理建议。2019年7月,该杂志又发表了EULAR 2018年更新的CIA护理建议。本文就更新后的CIA护理建议作一解说,以期为提高我国风湿病专科护理水平提供参考。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 50779015)
文摘Recent research on short-term topographic change in the Yangtze Estuary channel under storm surge conditions is briefly summarized. The mild-slope, Boussinesq and action balance equations are compared and analyzed. The action balance equation, SWAN, was used as a wave numerical model to forecast strong storm waves in the Yangtze Estuary. The spherical coordinate system and source terms used in the equation are described in this paper. The significant wave height and the wave orbital motion velocity near the bottom of the channel during 20 m/s winds in the EES direction were simulated, and the model was calibrated with observation data of winds and waves generated by Tropical Cyclone 9912. The distribution of critical velocity for incipient motion along the bottom was computed according to the threshold velocity formula for bottom sediment. The mechanism of rapid deposition is analyzed based on the difference between the root-mean-square value of the near-bottom wave orbital motion velocity and the bottom critical tractive velocity. The results show that a large amount of bottom sediments from Hengsha Shoal and Jiuduan Shoal are lifted into the water body when 20 m/s wind is blowing in the EES direction. Some of the sediments may enter the channel with the cross-channel current, causing serious rapid deposition. Finally, the tendency of the storm to induce rapid deposition in the Yangtze Estuary channel zone is analyzed.
文摘慢性炎症性关节炎(chronic inflammatory arthritis,CIA)是风湿免疫性疾病的重要临床表现之一,常导致患者关节疼痛、活动受限,甚至最终关节畸形、失能。CIA的主要特点为慢性进展和反复发作,因此须重视疾病管理,其中护理的作用不可或缺。2012年,欧洲抗风湿病联盟(European League Against Rheumatism,EULAR)在《风湿病年鉴(Annals of the Rheumatic Diseases)》杂志上发布了CIA护理建议。2019年7月,该杂志又发表了EULAR 2018年更新的CIA护理建议。本文就更新后的CIA护理建议作一解说,以期为提高我国风湿病专科护理水平提供参考。
