太湖遥感可测性蓝藻水华发生条件分析  

Analysis on the Occurring Conditions for RS Detective Blue-green Algae Bloom in Lake Taihu

作　　者：郁建桥[1] 吕学研[1] 

机构地区：[1]江苏省环境监测中心,江苏南京210036

出　　处：《环境科学与技术》2015年第6期93-98,105,共7页Environmental Science & Technology

基　　金：国家水体污染控制与治理科技重大专项项目(2012ZX07506-004)

摘　　要：以太湖蓝藻高发区的浮标站及蓝藻水华遥感监测结果为基础,分析探讨太湖遥感可测性蓝藻水华与水温、蓝藻密度、风向、风速等因素的相关性以及近年来蓝藻水华发生频次变化。结果表明,太湖蓝藻水华高发区遥感可测性蓝藻水华发生的有利条件为水温15~35℃、蓝藻密度200×10^4~1 300×10^4个/L、风速1.5~4.5 m/s、风向90~225°,最有利的条件为水温25~30℃、蓝藻密度500×104~600×10^4个/L、风速3.0~3.5 m/s、风向112.5~202.5°;太湖发生遥感可测性蓝藻水华的临界蓝藻密度为47×104个/L;2008-2013年遥感可测性蓝藻水华的发生次数没有显著降低,发生次数以7-8月份最多,9-10月份次之,其他月份较少。On the basis of the data from automatic monitoring buoy in the region of frequent blue-green algae bloom occurrence in Lake Taihu and the RS monitoring result of blue-green algae bloom, the relationship between RS detective blue-green algae bloom and water temperature, blue-green algae density, wind direction and wind speed and the occurrence frequency of blue-green algae bloom in recent years were analyzed and discussed. The results indicated that the favorable condition of RS detective blue-green algae bloom was water temperature 15-35℃, blue-green algae density 200×10^4 - 1 300×10^4 ind/L, wind speed 1.5-4.5 m/s and wind direction 90-225°. The most suitable water temperature, blue-green algae density, wind speed and wind direction was 25-30 ℃, 500×10^4 -600×10^4 ind/L, 3.0-3.5 m/s and 112.5×202.5°, respectively. The critical blue-green algae density for RS detective blue-green algae bloom was 47×10^4 ind/L. The reducing trend of RS detective blue-green algae bloom occurrence frequency from 2008 to 2013 was not significant. The highest occurrence frequency of blue-green algae bloom is in July and August and the second highest is in September and October. The frequency in the other months is relatively low.

关 键 词：太湖 遥感可测 蓝藻水华 

分 类 号：X830.2[环境科学与工程—环境工程] TV213.3[水利工程—水文学及水资源]