多成分水体的光学性质与遥感

不同水体的水的性质显示了极大的多变性，这与水体的湖泊学／光学类型、季节、生物活动的周期变化和人类影响有关。根据光学及其他性质，将水体放在线性的尺度上是不可能的。光学性质是由除了水体本身之外的光学灵敏水体组成物所决定的，这些组成物被称为水成份。     

大范围流域内水体三维仿真研究

建设数字流域的一个重要方面是利用数字流域水文地理信息平台建立起洪水演进仿真模拟系统。文章以大范围流域内的水体仿真为研究对象,详细描述了三维水体仿真的快速傅立叶变换(FFT)模型,并给出FFT模型的计算机实现方法及流程。在水体的三维仿真方面,借鉴大地形仿真技术,提出了水体仿真的细节层次技术和无缝拼接技术,并最终将研究结果应用于清江流域的可视化仿真系统。     

承压水体上采煤底板断层突水规律的研究

为了分析底板含水层水压及采动矿压对底板隔水层岩体上部与下部的影响与破坏，应用了相似材料模拟试验以及断层附近底板突水的力学分析方法，对底板突水机理有了进一步的认识；同时，由断层附近底板突水的力学分析方法所得到的理论计算结果，也可以作为判别类似条件下遇断层时承压水体上采煤是否安全的依据。     

冬季养鱼要“三防”安全越冬利春长

冬季鱼类养殖主要是做好“三防”工作，即防浅水、防缺氧、防冻害。做好这“三防”，不仅可使鱼类在冬季安全生长，还能使鱼类在入春后健康生长，增重速度加快，从而有效提高效益。     

Distribution of diatoms in the water and surface sediments of southern South China Sea

The relationship of species and abundance between the diatoms in the water and sediments from the southern South China Sea （SCS） were discussed, and the key environmental controlling factors were also investigated. Studies show that the diatom abundance is high in both water and sediments in the southeast part of the southern SCS and the varying trend is similar, while in the northwest part, the abundance is low, and the varying trend is different. The dominant diatom species are Thalassionema nitzschioides and Nitzschia bicapitata in water, and T. nitzschioides and Chaetoceros messanensis in sediments. The diatom species of small size and thin shell in water are more than in the sediments, while the diatom species of large size and thick shell in water are less. The percentage of species T. nitzschioides is higher in water of southeast part than in that of northwest part, but it is similar in sediments of both areas. It is shown that the southwest monsoon is the important factor influencing diatom abundance and T. nitzschioides percentage, and when the southwest monsoon is well developed, the distribution of diatom abundance and T. nitzschioides percentage are consistent in both water and sediments of the study area.     

宣武区：《大观园再生水景观水体富营养化防治技术研究与示范》项目进展顺利

近日，宣武区科委在大观园公园组织召开了《大观园再生水景观水体富营养化防治技术研究与示范》项目进展汇报会。