CAJ | 학술논문

基于一、三维耦合的溶解态保守性物质对流-扩散模型,计算了丰水期(1999年7月)和枯水期(2006年2月)珠江河口水体的平均停留时间。计算结果表明,珠江河口的水体交换有明显的季节特征,丰、枯水期珠江口的水体平均停留时间分别为8.9d和27.3d,内伶仃洋和外伶仃洋分别为丰水期与枯水期水体交换最强与最弱的子区域。仅考虑潮汐时,小潮时期珠江河口水体的平均停留时间小于大潮时期,而综合径流、季风等影响因素后则与之相反。空间上丰、枯水期均表现为口门附近水体停留时间较短,远离口门的水体停留时间较长。丰、枯水期珠江河口水体的平均停留时间均表现出从表层向底层递增的趋势,丰水期的垂向差异大于枯水期。
기우일、삼유우합적용해태보수성물질대류-확산모형,계산료봉수기(1999년7월)화고수기(2006년2월)주강하구수체적평균정류시간。계산결과표명,주강하구적수체교환유명현적계절특정,봉、고수기주강구적수체평균정류시간분별위8.9d화27.3d,내령정양화외령정양분별위봉수기여고수기수체교환최강여최약적자구역。부고필조석시,소조시기주강하구수체적평균정류시간소우대조시기,이종합경류、계풍등영향인소후칙여지상반。공간상봉、고수기균표현위구문부근수체정류시간교단,원리구문적수체정류시간교장。봉、고수기주강하구수체적평균정류시간균표현출종표층향저층체증적추세,봉수기적수향차이대우고수기。
Coupled one- and three-dimensional advection-diffusion models of dissolved conservative tracer were used to simulate the average residence time of the Pearl River Estuary in July 1999 (wet season) and February 2006 (dry season). Results indicate that the average residence time shows significant variation between wet and dry seasons. The average residence time of the estuary is 8.9 days in wet season and 27.3 days in dry season. In both seasons, the water exchange is the strongest in inner Lindingyang and the weakest in outer Lindingyang. The residence time of the estuary is longer at the spring tide than at the neap tide; however, it generally acts reversely with river runoff and monsoon. Actually, the residence time is relatively shorter in the regions adjacent to the river outlets and relatively longer in the outer regions, and it increases with depth, with more evident difference in the vertical in wet season than in dry season.