石头口门水库藻类种群组成特征研究

2008年9月5日采集石头口门水库42份水样,制片,电子显微镜下观察,研究结果表明：藻类共有5门,7纲,15目,27科,47属。其中,绿藻门最多,2纲,4目,9科,20属;其次是硅藻门,2纲,5目。7科,11属;再次是蓝藻门,1纲,3目,8科,13属;黄藻门较少,1纲,2目,2科,2属;红藻门仅有1纲,1目,1科,1属。采用血球计数板计数法计算原始水样中的藻类的平均密度。得出石头口门水库藻类的平均密度为3．80×10^4个／L,变动范围在1．00×10^4～8．00×10^4个／L之间。绿藻门属的数量和密度分别占到了42,55％,88．39％,是石头口门水库的优势藻类种群。     

新立城水库藻类水华环境因子分析及其预警监测

调查研究表明长春市新立城水库发生小范围藻类水华期间浮游植物藻类群落结构变化不明显,种群丰度增加。对监测数据进行了分析并与该地区非水华期间的监测数据相比较;同时对水质进行了环境因子相关性及对藻类水华的影响分析。结果显示溶解氧和温度是影响水库叶绿素a值变化的主要环境因子,且可以作为北方湖泊藻类水华预警的主要监测指标。     

辽宁大伙房水库水质评价

本文通过对大伙房水库主要污染物指标的分析,对大伙房水库的水质状况进行了评价,并对不同年份的评价结果进行了对比。     

崂山水库富营养化调查与评价

崂山水库是青岛的重要饮用水源地之一,通过调查和分析崂山水库的富营养化状况,发现高锰酸指数较稳定,浓度低于3.5mg/L;氮、磷是主要污染因子。其中,氮浓度连续10年超过国家《地表水环境质量标准》Ⅱ类标准,磷可能是崂山水库初级生产力的限制因子。针对这些问题,提出应把控制入库污染物排放源及在水库水源保护区内的综合治理放在首位。     

松华坝水源区环境保护与管理规划中的搬迁措施

松华坝水源是昆明市极为重要的饮用水源。近年来,由于人类活动对其水质产生了重大影响．昆明市居民饮水受到严重威胁。本文提出了用搬迁措施解决水源地面临的环境和水资源问题的思路、方案和主要工程步骤;并确切提出了移民安置方案和方案实施政策。     

九龙甸水库水质评价及富营养化趋势分析

根据1998—2007年的水质监测资料,对九龙甸水库进行水质现状评价和富营养化现状及其变化趋势分析。结果表明,九龙甸水库水质良好,目前属中营养化。富营养化趋势不明显,但有水质恶化的趋势,各部门应加大对九龙甸水库的保护以及周边环境治理的力度,保证城乡居民饮用水安全。     

Effect of a seasonal di use pollution migration on natural organic matter behavior in a stratified dam reservoir

This article aims to describe the influence of di use pollution on the temporal and spatial characteristics of natural organic matter (NOM) in a stratified dam reservoir, the Daecheong Dam, on the basis of intensive observation results and the dynamic water quality simulation using CE-QUAL-W2. Turbidity is regarded as a comprehensive representation of allochothonous organic matter from di use sources in storm season because the turbidity concentration showed reasonable significance in a statistical correlation with the UV absorbance at 254 nm and total phosphorus. CE-QUAL-W2 simulation results showed good consistency with the observed data in terms of dissolved organic matter (DOM) including refractory dissolved organic carbon (RDOC) and labile DOC and also well explained the internal movement of constituents and stratification phenomenon in the reservoir. Instead turbidity and NOM were related well in the upper region of the reservoir according to flow distance, gradually as changing to dissolved form of organic matter, RDOM a ected organic matter concentration of reservoir water quality compared to turbidity. To control the increase of soluble organic matters in the dam reservoir, appropriate dam water discharge gate operation provided e ective measurement. Because of the gate operation let avoid the accumulation of organic matter within a dam reservoir by shorten of turbid regime retention time.     

Shallow groundwater nitrogen responses to di erent land use managements in the riparian zone of Yuqiao Reservoir in North China

This field study investigated the nitrogen concentrations in the shallow groundwater from an ephemeral stream and four land uses： cropland, two-year restored （2yr） and five-years restored （Syr） woodlands, fishponds, and the nitrogen flux in the riparian zone of Yuqiao Reservoir. The groundwater nitrate-N concentrations in cropland were the highest among the four land uses. Total dissolved nitrogen （TDN） and nitrate-N concentrations in the 2yr woodland were significantly （p 〈 0.05） higher than in 5yr woodland. The lowest nitrogen concentrations were detected in fishponds. Nitrate-N was the main form in cropland and 2yr woodland, whereas both nitrate-N and dissolved organic nitrogen （DON） were the main species in 5yr woodland and fishponds. But, ammonium-N was the main form in the ephemeral stream. During the rainy season, the groundwater flow with dissolved nitrogen drains from upland into the reservoir along the hydraulic gradient. The woodland between the cropland and reservoir could act as a buffer to retain shallow groundwater nitrogen. The dominant form of ammonium-N in the groundwater TDN pool in ephemeral stream indicated that nitrogen from the village and orchard in upland flowed into the reservoir via subsurface flow. The fishpond was not an important pollution source for nitrogen transfer via shallow groundwater.     

册田水库水质变化趋势及治理措施

通过对册田水库干、支流水质监测断面污染因素的分析,并结合近10a来册田水库出口断面水质污染指数变化情况,揭示了近年来册田水库水质恶化的原因,针对这些因素提出了改善水库水质的具体措施。     

中庭式建筑内回廊排烟方法有效性的研究

中庭式建筑各楼层均通过中庭相连,因此给建筑物内机械排烟设计造成了困难.近年来一些学者提出了回廊排烟的概念,但并没有进行深入的研究.本文采用二维线性羽流模型对回廊排烟过程进行了描述,从理论上分析了采用回廊排烟控制建筑内烟气蔓延的效果.并采用FDS对一实际中庭式建筑采用回廊排烟的效果进行了模拟,对理论分析进行了验证.还对回廊内蓄烟池的深度进行了讨论,提出将回廊蓄烟池深度设为1 m左右是比较合适的.