CAJ | 학술논문

入海河口中河水与海水的混合是海洋学中一个重要的界面过程，两者混合尺度和混合速率关系到河流携带物质的扩散范围和归宿，采用天然示踪剂224 Ra 和226 Ra 计算河水与海水的混合速率。2010年8月28日，采集了闽江河口区地下水样20个、河水样13个、河水与海水的混合水样12个，分别测量了每个水样的盐度、224 Ra 活度和226 Ra 活度。结果表明：地下水中224 Ra、226 Ra 活度普遍高于河水；所有水体中的224 Ra活度普遍都高于226 Ra 活度；河水遇到海水后，224 Ra 活度出现较大幅度的增加，而226 Ra 活度的增加并不明显。基于224 Ra 与226 Ra 半衰期的差异，在只有河水与海水发生涡流混合的情况下，计算获得河水与海水的混合速率为140．2～142．5 m/h。
입해하구중하수여해수적혼합시해양학중일개중요적계면과정，량자혼합척도화혼합속솔관계도하류휴대물질적확산범위화귀숙，채용천연시종제224 Ra 화226 Ra 계산하수여해수적혼합속솔。2010년8월28일，채집료민강하구구지하수양20개、하수양13개、하수여해수적혼합수양12개，분별측량료매개수양적염도、224 Ra 활도화226 Ra 활도。결과표명：지하수중224 Ra、226 Ra 활도보편고우하수；소유수체중적224 Ra활도보편도고우226 Ra 활도；하수우도해수후，224 Ra 활도출현교대폭도적증가，이226 Ra 활도적증가병불명현。기우224 Ra 여226 Ra 반쇠기적차이，재지유하수여해수발생와류혼합적정황하，계산획득하수여해수적혼합속솔위140．2～142．5 m/h。
The mixing between river water and seawater is a key interface process in the estuary.The mixing scale and rate concern the dispersion range and fate of the material transported by river.The aim of this paper is to calculate the transport rate of river plume in the estuary by using naturally occurring tracer 224 Ra and 226 Ra.In August 2010,we collected twenty groundwater samples,thirteen river water samples and twelve mixing samples in the estuary to measure the salinity,224 Ra and 226 Ra activities.The results showed that,1)224 Ra and 226 Ra activities in the groundwater samples were generally higher than those in the river water samples;2 )224 Ra activity was generally higher than 226 Ra activity in every sample;3)224 Ra activity largely increased when river water mixed with seawater,however,226 Ra activity increased slightly.Based on the differences of radioactive half-life between 224 Ra and 226 Ra,and only eddy diffusion mixture occurring between river water and seawater,the transport rate for river plume in the estuary was calculated to be 140.2 142.5 m/h.