渤海陆源入海污染源在线监测系统建设探究          下载免费PDF全文

张蒙蒙  曲宣彰  赵玉慧  于庆云  尹维翰  宋文鹏 《海洋开发与管理》2018,35(1):95-99

文章通过探究国内外在线监测技术发展状况,针对渤海陆源入海污染源环境现状,从国家方针政策、监测体系现状等多方面提出了渤海陆源入海污染源在线监测系统建设的必要性。并根据目前渤海陆源入海污染源在线监测系统的建设情况,分析其存在的问题,提出通过加快标准制度建设、引导社会力量参与研发、顶层设计分步实施、强化人才队伍建设等方面举措推进在线监测系统建设工作,以期能为正在进行的渤海陆源入海污染源在线监测系统建设提供帮助。  相似文献   

近震波形反演震源机制解方法对比研究     

陈俊磊  周青云  刘峰  张天继  杨黎薇  赵昆 《大地测量与地球动力学》2021,41(1):79-82

分别利用近震波形反演求解震源机制解的gCAP方法和全波形反演方法反演了鲁甸MS6.5地震的震源机制解,并比较两种方法的优点与特性。结果发现,数据方位角的覆盖范围会影响解的稳定性,在使用gCAP方法时尤其需要注意;两种方法获取的震源机制解结果较为一致,走向为73°~77°,倾角为72°~85°,滑动角为157°~180°。  相似文献   

GIS与模型技术在城市排水管线承载力评价中的应用     

解智强  杜清运  高忠  王贵武  黄俊 《测绘通报》2011,(12):50-53

昆明旧城改造过程中,在城中村片区利用GIS技术对城市水环境进行数据库建设,并结合先进的InfoWorks CS软件进行排水模型计算,通过科学分析,对城市地下排水管线针对规划进行合理评价,为城市规划市政设计提供科学、准确的决策依据。  相似文献   

指标驱动下以任务流为中心的在线交互制图模型     

赵飞  杜清运  彭子风  任福 《测绘学报》2011,40(5):655-661

在线制图是一个复杂的交互过程,任务流是交互制图系统的一种新理念和新方法。分析不同的地图制图模型,根据统计数据和专题地图可视化的特点,提出统计指标驱动下以任务流为中心的在线地图制图模型,并给出网络地图符号XML定义描述,结合某市在线动态专题地图可视化的应用实例,研究基于该模型的统计数据Web空间可视化的各种方法和应用,表明该可视化体系和功能流程模式具有很好的推广价值。  相似文献   

Urban growth pattern modeling using logistic regression   总被引：1，自引：0，他引：1  

Yu Nong  Qingyun Du 《地球空间信息科学学报》2011,14(1):62-67

Transformation of land use/land cover change occurs due to the numbers and activities of people.Urban growth mod-eling has attracted substantial attention because it helps to comprehend the mechanisms of land use change and thus helps relevant policies made.This paper tends to apply logistic regression to model urban growth in the Jiayu county of Hubei province,China.It is applied in a GIS environment to calculate variables and,then,in SPSS to discover the relationships between urban growth and the driving forces.The relative operating characteristic(ROC) shows the modeling accuracy with the curve 0.891 with standard er-ror 0.001.A probability map is generated finally to predict where urban growth will occur as a result of the computation.The result shows the model simulates urban growth well in the county scale.  相似文献   

A New Precipitation Index for the Spatiotemporal Distribution of Drought and Flooding in the Reaches of the Yangtze and Huaihe Rivers and Related Characteristics of Atmospheric Circulation     

ZONG Haifeng  ZHANG Qingyun 《大气科学进展》2011,28(2):375-386

Characteristics of the spatiotemporal distributions of precipitation anomalies in the reaches of the Yangtze River and Huaihe River (YHR) were studied using EOF method. Four main precipitation pat-terns for the YHR in summer identified by the first two modes: a region-wide flood over the entire YHR (RWF); a region-wide drought over the entire YHR (RWD); a flood in the south with a drought in the northern region of the Yangtze River (FS-DN); and a drought in the south with a flood in the northern region of the Yangtze River (DS-FN). Based on the first two modes and the actual precipitation departure percentage, a new precipitation index is defined in this paper. The typical flood/drought years associated with the various rainfall patterns defined by this precipitation index are more representative and closer to reality compared to some existing precipitation indexes which just use the area-mean precipitation or the EOF time components individually. The characteristics of atmospheric circulation in summer corresponding to the four main precipitation patterns over the YHR in summer show the features of atmospheric circulation differ in different precipitation pattern years. Although the different patterns share a common main influential circulation system, such as the blocking high over northeastern Asia, the low trough of westerly flows in the mid latitudes, the West Pacific Subtropical High (WPSH), and the high ridge over the Tibet Plateau, the difference in location and intensity of these systems can lead to different distributions of precipitation anomalies.  相似文献   

Distribution of AVS-SEM, transformation mechanism and risk assessment of heavy metals in the Nanhai Lake in China   总被引：1，自引：0，他引：1  

Jiang He  Changwei Lü  Qingyun Fan  Hongxi Xue  Jinhua Bao 《Environmental Earth Sciences》2011,64(8):2025-2037

Distribution of AVS (acid volatile sulfide)-SEM (simultaneously extracted metals), transformation mechanism and risk assessment of heavy metals in the Nanhai Lake in Baotou City were discussed in this work. The results showed that the content of heavy metals in sediments increased due to the water pumped from the Yellow River, domestic sewage, municipal runoff and yacht waste release. Increasing water depth, domestic sewage influx and hydrophyte booming made the AVS level higher in downstream than upstream. The vertical distribution of AVS is characterized as multiple-peak in the sediment cores from the studied lake. Comparatively, the control abilities of the carbonate and sulfate to the heavy metals were five orders of magnitude lower than the sulfide phase. Therefore, AVS was the key factor controlling the precipitation of heavy metals in the Nanhai Lake. The ratio of SEM/AVS in the sediments, the acute sediment quality criteria and the chronic sediment quality criteria indicated that no acute toxicity for benthic organisms can be expected, and the AVS plays an important role in controlling the bioavailability and toxicity of heavy metals in the Nanhai Lake.  相似文献   

四川盆地东北部三次持续性暴雨过程水汽输送特征分析     

李晓容  高青云  付世军 《湖北气象》2020,39(3):234-240

采用欧拉方法分析盆地东北部夏季3例持续性暴雨过程的水汽输送及其异常特征,并利用拉格朗日轨迹模式模拟计算了影响川东北的主要水汽输送通道,结果表明:(1)不同纬度多系统相互作用对水汽输送的加强,是造成2007年和2010年两例持续性暴雨水汽强度异常大的重要原因。2012年持续性暴雨个例中异常水汽主要源于孟加拉湾和南海两支水汽的共同作用。(2)水汽源地可追溯至孟加拉湾、南海、西太平洋和阿拉伯海。边界层的水汽输送更多是自南海沿华南地区进入川东北;中低层水汽输送路径,或以孟加拉湾进入川东北,或以南海进入川东北,或两者共同作用。在垂直方向上,多条水汽输送通道的相互叠加,促使川东北产生强的水汽通量。(3)每条水汽输送通道在不同的个例中主次作用不一致。同一个例的水汽输送通道并非固定不变,不同降雨阶段可能与不同水汽输送通道对应。  相似文献   

一种由单值预报生成定量降水概率预报的方法及初步应用   总被引：2，自引：1，他引：1  

刘莹  赵琳娜  段青云  梁莉  巩远发  董航宇 《气象》2013,39(3):313-323

利用1981年1月1日至2003年12月31日淮河流域59个站的降水观测及同时段美国GFS集合预报模式回算的24 h降水量集合平均预报资料,建立条件亚正态分布函数的概率预报模型并得到集成预报.针对淮河流域子流域的试验结果表明:新方法生成的集成预报的均方根误差在所有子流域和各个季节的误差都有显著降低,其中蚌埠至洪泽湖流域6月的均方根误差降低了3.11 mm.4个子流域通过该模型得到的集成预报的Brier技巧评分在0.16～0.61,说明该集成预报在整年都具有一定预报价值.在淮河上游大坡岭至息县流域,当实际日面雨量阈值为0.00～7.82 mm的预报时,夏季的集成预报出现不同程度的低报;但当实际日面雨量阈值为18.12 mm时,夏季的集成预报表现出较好的可靠性.百分位评估则进一步表明该集成预报能较好地预报出小量级的面雨量,而对30.00 mm以上面雨量的预报能力相对较弱.  相似文献   

Spatial distribution of nitrification and denitrification rates of sediment in Wenruitang River,Wenzhou, China     

Lu  Shaoyong  Jin  Xiangcan  Guo  Jianning  Bu  Qingyun  Yang  Feipen  Chen  Xiping  Yao  Yuye 《中国地球化学学报》2006,25(1):20-20

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