摘要
运用均匀随机数以等级评价标准产生建模样本和验证样本,利用实数编码的加速遗传算法(RAGA)求解逻辑斯缔曲线(LogisticCurve)水环境评价模型中的参数,建立了富营养化等级评价模型,据此计算了乌梁素海1996～2003年夏初、仲夏、秋末3个时点的富营养化等级,分析了乌梁素海富营养化主控因子及其等级的年季动态变化特征和它们之间的影响关系。结果表明:1996～2003年乌梁素海各富营养化主控因子均变化在4级富营养化指标左右,除总磷波动性较大以外,其他各项指标均呈逐年恶化趋势;而综合富营养化等级均超过4级,且呈逐年增加趋势,目前已十分接近5级———极富营养化状态。
The assessment model of eutrophication has been established by used of Accelerating Genetic Algorithm and Logistic Curve in this paper. According to the model, the eutrophication levels of the different season from 1996 to 2003 in Wuliangsuhai Lake have been concluded. Based on the level, the season-year changes of the eutrophication main-control factors in Wuliangsuhai Lake have been analyzed. The result shows that all the main-control factors of eutrophication remain forth level and except that the total phosphorus has great fluctuation, the others are rising by and by from 1996 to 2003. The whole levels of the water quality have beyond the forth level and close to the fifth level.
出处
《水文》
CSCD
北大核心
2004年第3期14-17,24,共5页
Journal of China Hydrology
基金
国家自然科学基金资助项目(50269001
50169002)
关键词
富营养化
评价模型
主控因子
年季变化
乌梁素海
eutrophication
assessment model
main-control factors
season-year change
Wuliangsuhai Lake
