In studying sand beach erosion and protection tactics in Liaoning Province, the authors calculated the wavedata of 27 a Period (1963-1991) at Bayuquan Observation Station in Liaodong Gulf. Together with the beach leve...In studying sand beach erosion and protection tactics in Liaoning Province, the authors calculated the wavedata of 27 a Period (1963-1991) at Bayuquan Observation Station in Liaodong Gulf. Together with the beach levellingsand some simple marking stakes monitoring and by having the aid of local annals, the paper analysed the present situationsof the coastline and the causes of sand coastal recession and serious consequences, and then discussed the dynamic processof alongshore sand transport. Simultaneously, based on alongshore sand transport model, oneline cut-and-fill theory anddynamical water model(sea level rise), the authors preliminary estimated beach process for the future in the area.Recently, the coastline is being eroded and 2/3 of the sand coast is subjected to erosion, which the recession rate ofthe individual sector exceed 7. 0 m/a. Coastal erosion has threatened villages, roads, factories and tourist resources. Sealevel rises and the decreasing amount of materials by rivers discharged into the sea and the activities of man, made coast line recession rate accelerate, and cause a great loss of land in the area.展开更多
黑碳仪是最常用的气溶胶吸光碳测试仪器,但其测得的吸光性能受到滤膜多重散射效应、颗粒物散射效应、颗粒物遮蔽效应的影响,只能算是 b ATN (光衰减系数),而不是 b in-situ (原位吸光系数).虽然已有学者提出几种将 b ATN 转换为 b cor ...黑碳仪是最常用的气溶胶吸光碳测试仪器,但其测得的吸光性能受到滤膜多重散射效应、颗粒物散射效应、颗粒物遮蔽效应的影响,只能算是 b ATN (光衰减系数),而不是 b in-situ (原位吸光系数).虽然已有学者提出几种将 b ATN 转换为 b cor (校正后吸光系数)的算法,但多是基于实验室模拟或高海拔地区气溶胶而开展的,与我国城市的气溶胶在理化性质方面有明显差别.为探索我国城市气溶胶将 b ATN 转换为 b cor 的问题,于2016—2017年冬季在北京市城区使用黑碳仪及光声消光仪分别测量 b ATN 和 b in-situ ,在分析多种算法的基础上,提出了面向城市气溶胶的校正方法.结果显示:在我国北方城市(以北京市为例),适应城市气溶胶的 f 值(遮蔽因子,为计算遮蔽校正系数的一个参数)为1.13, C (综合散射效应系数)为5.44;使用这些校正系数,将观测点由黑碳仪获取的 b ATN 转换为 b cor .与光声消光仪测定的 b in-situ 对比发现,无论是滤膜样点周期内还是长期观测时间内, b cor 与 b in-situ 均呈一致性,其中,长期观测时间内二者的相关性表达为 y =0.954 x +0.829(r 2为0.996),证明了校正方法的有效性和可信性.研究显示, b cor 与 b in-situ 整体相关性较高,并且获得了本地化的校正因子,实现了仅通过黑碳仪获取准确颗粒物吸光系数的目的.展开更多
文摘In studying sand beach erosion and protection tactics in Liaoning Province, the authors calculated the wavedata of 27 a Period (1963-1991) at Bayuquan Observation Station in Liaodong Gulf. Together with the beach levellingsand some simple marking stakes monitoring and by having the aid of local annals, the paper analysed the present situationsof the coastline and the causes of sand coastal recession and serious consequences, and then discussed the dynamic processof alongshore sand transport. Simultaneously, based on alongshore sand transport model, oneline cut-and-fill theory anddynamical water model(sea level rise), the authors preliminary estimated beach process for the future in the area.Recently, the coastline is being eroded and 2/3 of the sand coast is subjected to erosion, which the recession rate ofthe individual sector exceed 7. 0 m/a. Coastal erosion has threatened villages, roads, factories and tourist resources. Sealevel rises and the decreasing amount of materials by rivers discharged into the sea and the activities of man, made coast line recession rate accelerate, and cause a great loss of land in the area.
文摘黑碳仪是最常用的气溶胶吸光碳测试仪器,但其测得的吸光性能受到滤膜多重散射效应、颗粒物散射效应、颗粒物遮蔽效应的影响,只能算是 b ATN (光衰减系数),而不是 b in-situ (原位吸光系数).虽然已有学者提出几种将 b ATN 转换为 b cor (校正后吸光系数)的算法,但多是基于实验室模拟或高海拔地区气溶胶而开展的,与我国城市的气溶胶在理化性质方面有明显差别.为探索我国城市气溶胶将 b ATN 转换为 b cor 的问题,于2016—2017年冬季在北京市城区使用黑碳仪及光声消光仪分别测量 b ATN 和 b in-situ ,在分析多种算法的基础上,提出了面向城市气溶胶的校正方法.结果显示:在我国北方城市(以北京市为例),适应城市气溶胶的 f 值(遮蔽因子,为计算遮蔽校正系数的一个参数)为1.13, C (综合散射效应系数)为5.44;使用这些校正系数,将观测点由黑碳仪获取的 b ATN 转换为 b cor .与光声消光仪测定的 b in-situ 对比发现,无论是滤膜样点周期内还是长期观测时间内, b cor 与 b in-situ 均呈一致性,其中,长期观测时间内二者的相关性表达为 y =0.954 x +0.829(r 2为0.996),证明了校正方法的有效性和可信性.研究显示, b cor 与 b in-situ 整体相关性较高,并且获得了本地化的校正因子,实现了仅通过黑碳仪获取准确颗粒物吸光系数的目的.
