彩色合成选择法及其在黄河入海口研究中的应用

彩色合成选择法是根据色度学原理,求出地物之间在各种彩色合成方案中的色差,以选择彩色合成方案。将此方法应用到黄河入海口,提取黄河水、海水、沙滩、陆地等主要地物信息,效果明显。     

Application of Grain Size Analysis to Study Sedimentary Environment of Sand Dune in the Vicinity of Tumen River

The dunes in estuary of Tumen River in China lie to the area between the Jiushaping and Fangchuan in the left bank of Tumen River (Fig.1). The dis-tance is about 15～20 km between the dunes and the coast. It ranges from China to D. P. R. Korea and Russia. The range of the height of dunes is about 15～20 m and the width is 100～200 m. By the re-connaissance, we protracted 9 section planes of the dunes and collected 40 sand samples of the dunes, and identified the sedimentary environment …     

2009年春季黄河口附近海域营养状况评价

根据2009年5月在黄河口附近海域获得的水化学参数,研究了该海域营养要素的分布特征与富营养化水平.NO3-N、NO2-N与SiO3-Si表层浓度在河口处均存在高值区,随淡成水混合逐渐降低,表明主要来源于黄河冲淡水;NH4-N与PO4-P在河口处则低于调查海区平均水平,说明黄河冲淡水不是其主要来源.黄河口南部浅滩区域(平...     

福建漳江口红树林保护区浮游植物群落的季节变化研究

于2001年1月～2003年1月对福建省漳江口红树林区水体浮游植物群落的季节变化进行了研究。结果表明,漳江口红树林区浮游植物以硅藻门种类为主,优势种为长菱形藻(Nitzschia longissima)和菱形藻(Nitzschia sp.1)等,同时出现多种裸藻、绿藻和甲藻。本次调查共鉴定到浮游植物31属87种(包括变种),其中硅藻门23属75种(包括变种),蓝藻门3属3种,绿藻门1属4种,金藻门1属1种,甲藻门2属2种,裸藻门1属2种。浮游植物密度变化范围为2.78×104～1.14×106个/L,平均为3.51×105个/L,季节变化为双峰型。出现大量的底栖硅藻和淡水性藻类是该水域浮游植物的一个特点。浮游植物的组成和结构表明该水域水质较好。     

Verification of the dualism ordering method by the canonical correspondence analysis: fish community samples

Two ordination techniques (Romaniszyn diagram, RD, and Canonical correspondence analysis, CCA) were applied to the same data set (fish assemblage composition along two Paraná river tributaries and associated environmental variables), to identify spatial community patterns and further to evaluate the performance of RD. The major patterns in these Brazilian streams were successfully revealed by both methods (i.e. clear separation of both tributaries on the basis of fish assemblage composition and environmental factors), but more complex situations may limit the application of RD in comparison with CCA.     

雅鲁藏布江加查段河流地貌对构造运动和气候的响应

通过对雅鲁藏布江加查段河流地貌和构造调查发现,该区具有平行状水系格局,河谷地貌以峡谷和宽谷相间为主要特征,经历了碰撞、挤压和伸展构造演化过程,产生了褶皱-逆冲、走滑剪切、韧性剪切、正断层等构造变形样式.该段河谷地貌的形成演化受构造运动和气候等影响.雅鲁藏布江加查段河流至少从上新世以来沿构造运动产生的不同性质断裂构造溯源...     

Preliminary Study on Cenozoic Group and Fault Activity in the Sea Area Near the Yangtze River Mouth

By shallow seismic prospecting, the Cenozoic Group in the sea area near the Yangtze Rver Mouth can be divided into five seismic sequences. They correspond to the Quaternary,Pliocene, Upper Miocene, Lower Miocene and Eocene respectively. The Quaternary System covers all the detecting area. The Tertiary System overlaps and thins out from NE to SW. The sedimentary basement mainly consists of volcanic rock (J3) and acidic rock (r35). Paleogene or Late Cretaceous basins are not found there. The faults that have been detected are all normal faults. They can be divided into three groups (NE, NW, near EW) by their trend. The NE and NW-trending faults are predominant, and agree with aeromagnetic anomaly. Their length and displacement are larger than that of the EW-trending faults. The activity of the NEtrending faults is different in different segments. The SW segment is a Quaternary fault, the middle segment is a Neogene fault, The NE is Paleogene. But the segment of the NW-trending fault is not obvious. The average vertical displacement rate is about 0.015mm/a.     

The Relationship Between June Precipitation over Mid-Lower Reaches of the Yangtze River Basin and Spring Soil Moisture over the East Asian Monsoon Region

Using the US Climate Prediction Center(CPC)soil moisture dataset and the observed precipitation over China together with the NCEP/NCAR reanalysis wind and air temperature,the relationship between June precipitation over mid-lower reaches of the Yangtze River basin(MLR-YRB)and spring soil moisture over the East Asian monsoon region was explored,with the signal of the ENSO effect on precipitation removed.A significant positive correlation was found between the mean June precipitation and the preceding soilmoisture over the MRL-YRB.The possible response mechanism for this relationship was also investigated.It is found that when the soil over the MRL-YRB is wetter(drier) than normal in April and May,theair temperature in the lower troposphere over this region in May is lower(higher) than normal,and this temperature effect leads to a decrease(increase) in the temperature contrast between the land and the sea.Generally,a decrease(increase) in the land-sea temperature contrast leads to weaker(stronger) East Asian summer monsoon in June.Southerly(northerly)wind anomalies at 850 hPa then show up in the south of the Yangtze River basin while northerly(southerly)wind anomalies dominate in the north.These anomalies lead to the convergence(divergence) of wind and water vapor and hence gives rise to more(less) precipitation in June over the MLR-YRB.     

优化的NSGA-Ⅱ方法在马莲河流域水资源综合管理中的应用研究

根据马莲河流域水资源总量极端贫乏、年际年内分配不均、常规水资源量低、水污染问题较严重等特点,利用系统分析理论和优化技术建立了流域的大系统、多目标水资源优化配置模型,并利用优化的NSGA-Ⅱ方法进行求解,得到流域2020年期望水资源配置下的最佳分配方案为:流域总供水量57 086×104m3,工业供水量21 690×104m3(总产值约为144.6亿元),能源基地供水量4 329×104m3(总产值约为346.32万元),农业供水量20 840×104m3,生活供水量9 452×104m3,生态供水量811×104m3。对比期望方案供水量增加了6 710×104m3,综合缺水率减少了11.41%。并根据预测的流域的分配方案和预测的流域需水量,进行了流域的水资源平衡分析,通过平衡分析的结果进行流域的综合管理研究。2020年在最优水资源分配方案下,工业缺水率3.21%、减少了4.51%;能源基地缺水率0.00%;农业缺水率4.64%、缺水率增加26.17%;生活缺水率0.00%;生态缺水率1.00%、缺水率增加了1.00%。配置方案实现了流域内水资源的最佳分配,使宝贵、有限的水资源产生最大的社会、经济及环境效益,为流域经济、能源产业的快速发展提供水资源保障。     

郑州黄河国家地质公园生态环境地质状况及防治措施分析

在收集分析大量最新资料基础上,重点介绍了郑州黄河国家地质公园的地貌特征、区域地质背景、水文地质条件,调查了公园内的生态环境地质状况,对已出现的重要生态环境地质问题提出了相应的措施及防治对策,实现对生态环境地质的妥善保护、合理开发与科学重建.