CAJ | 학술논문

通过采集太湖八房港和闾江口疏浚后与未疏浚沉积物柱状样于室内模拟“湖泛”的发生与消退过程来研究底泥疏浚对藻源性“湖泛”形成和消退的影响.结果发现,疏浚能有效的延缓“湖泛”发生的时间,八房港和闾江口疏浚后沉积物柱状样水体色度均要低于未疏浚对照样,水体泛黑的时间也分别比未疏浚对照样延迟6d和2d.疏浚沉积物对上覆水柱中营养盐的含量也有较好的控制,试验过程中八房港和闾江口疏浚后沉积物柱状样水体中 NH4+-N 的含量仅分别未疏浚对照组的40%和77.1%,PO43--P 的含量也仅分别为未疏浚对照组的41.4%和78.1%.值得注意的是,疏浚沉积物所对应的水柱中 Fe2+和 S2-的含量均要高于未疏浚对照组.八房港和闾江口疏浚沉积物中亚铁的含量分别是未疏浚对照样的78.1%和76.4%,而闾江口疏浚后沉积物中酸挥发性硫化物(AVS)的含量则是未疏浚对照的1.36倍.沉积物中铁、AVS的含量没有表现出明显的垂向分布特征.
통과채집태호팔방항화려강구소준후여미소준침적물주상양우실내모의“호범”적발생여소퇴과정래연구저니소준대조원성“호범”형성화소퇴적영향.결과발현,소준능유효적연완“호범”발생적시간,팔방항화려강구소준후침적물주상양수체색도균요저우미소준대조양,수체범흑적시간야분별비미소준대조양연지6d화2d.소준침적물대상복수주중영양염적함량야유교호적공제,시험과정중팔방항화려강구소준후침적물주상양수체중 NH4+-N 적함량부분별미소준대조조적40%화77.1%,PO43--P 적함량야부분별위미소준대조조적41.4%화78.1%.치득주의적시,소준침적물소대응적수주중 Fe2+화 S2-적함량균요고우미소준대조조.팔방항화려강구소준침적물중아철적함량분별시미소준대조양적78.1%화76.4%,이려강구소준후침적물중산휘발성류화물(AVS)적함량칙시미소준대조적1.36배.침적물중철、AVS적함량몰유표현출명현적수향분포특정.
In order to estimate the effects of dredging on the prevention and control of black bloom, four intact sediment cores had been sampled from dredged and un-dredged areas of Bafang port and Lujiang port to simulation the occurrence and regression of algae-caused black bloom with Y-shape apparatus. Results showed that dredging has a good effect on prevention the degree of algae-caused black bloom. The color of water in dredged treatment group was lighter than the control, and the occurrence time of black bloom in dredged sites of Bafang port and Lujiang port was delayed 6days and 2days, respectively. The concentrations of NH4+-N, PO43--P in overlying water of dredged treatment group of Bafang port and Lujiang port were only 40%, 77.1%, 41.4%and 78.1%of control treatment, and the concentrations of Fe2+and S2-in overlying water of dredged treatment group were higher than control. The concentrations of Fe2+ in sediments of dredged sites of Bafang port and Lujiang port were 78.1%and 76.4%of control sites, and the concentration of Acid Volatile sulphide (AVS) in dredged site of Lujiang port was 1.36times than control. Vertical distribution characteristics of Fe2+and AVS in sediment were not observed in this experiment. Overall, dredging can effectively prevent the occurrence of black bloom.