期刊文献+
共找到332篇文章
< 1 2 17 >
每页显示 20 50 100
Water purification with sintered porous materials fabricated at 400℃ from sea bottom sediments 被引量:2
1
作者 DABWAN Ahmed H A IMAI Daizo +5 位作者 KANECO Satoshi SENMATSU Isamu NAKAHAMA Katsuyuki KATSUMATA Hideyuki SUZUKI Tohru OHTA Kiyohisa 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第2期172-176,共5页
A sintering technology for preparing porous materials from sea bottom sediments was developed for use in water purification. The purpose of the present study was to develop methods for converting the sea bottom sedime... A sintering technology for preparing porous materials from sea bottom sediments was developed for use in water purification. The purpose of the present study was to develop methods for converting the sea bottom sediments dredged from Ago Bay into value-added recycled products. The sintered products fabricated at 400℃ were found to be very effective adsorbents for the removal of heavy metals. 展开更多
关键词 sintering preparation technology porous materials sea bottom sediments water purification heavy metals
下载PDF
Distribution of Macro-elements and Natural Radionuclides in the Bottom Sediments and Soils of the Catchment Areas of Small Lakes in the Baikal Region
2
作者 Vosel Yulia Strakhovenko Vera 《地学前缘》 EI CAS CSCD 北大核心 2009年第S1期22-22,共1页
The examination of macroelements and natural radionuclides in the bottom sediments of small lakes and soils in the catchment areas of the Baikal region allows for the study of the mechanism of inflow and the source of... The examination of macroelements and natural radionuclides in the bottom sediments of small lakes and soils in the catchment areas of the Baikal region allows for the study of the mechanism of inflow and the source of these materials.On the basis of the results of rentgenostructural analysis lake sediments are divided into four types:terrigenous,carbonate, terrigenous-carbonate and organogenic.Through the analysis of gamma-ray spectrometry and ato- 展开更多
关键词 LAKE bottom sedimentS CATCHMENT areas Th/U
下载PDF
EFFECTS OF ANAEROBE IN SEA BOTTOM SEDIMENT ON THE CORROSION OF CARBON STEEL
3
作者 马士德 黄彦良 +2 位作者 朱素兰 孙嘉瑞 杜爱玲 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 1998年第4期377-380,共0页
This in situ corrosion study of steel in sea bottom sediment by the "Plate TransplantingBurying Method" (MD method ) showed that the corrosion rate of steel in sea bottom sediment with sulfur reduction bacte... This in situ corrosion study of steel in sea bottom sediment by the "Plate TransplantingBurying Method" (MD method ) showed that the corrosion rate of steel in sea bottom sediment with sulfur reduction bacteria (SRB) can be as high as ten times that in sea bottom sediment without SRB . The ex-periments in simulating sea bottom sediments with different concentrations of cultured SRB showed that theelectrochemical polarization behaviour of steel in sea bottom sediment with and without SRB were differ-ent SRB altered the polarization behaviour of steel significantly by acididfying the environment so that ap-parent hydrogen depolarization occurred and accelerated the corrosion of steel. 展开更多
关键词 ANAEROBE SEA bottom sediment steel
全文增补中
Assessment of Cu, Pb and Hg Contamination in Bottom Sediments Of Surface Water in XuZhou 被引量:1
4
作者 王晓 韩宝平 朱雪强 《Journal of China University of Mining and Technology》 2004年第1期70-72,共3页
Pollution of heavy metals Cu,Pb and Hg is assessed using geo-accumulation index in this paper. The result shows that the bottom sediments of surface water in Xuzhou is polluted by these heavy metals to deferent degree... Pollution of heavy metals Cu,Pb and Hg is assessed using geo-accumulation index in this paper. The result shows that the bottom sediments of surface water in Xuzhou is polluted by these heavy metals to deferent degrees, of which the Jinma River is the most serious, and then the Kuihe River, the abandoned Yellow River, and the Jinghang Canal. The Yunlong Lake has also been polluted by Hg. The three kinds of heavy metals in the order of concentration is Hg>Cu>Pb. The pollution degree and the type of element is closely related with industrial structure in Xuzhou. 展开更多
关键词 srface water bottom sediment heavy metal contamination index of Geo-accumulation
下载PDF
Wave-current bottom shear stresses and sediment re-suspension in the mouth bar of the Modaomen Estuary during the dry season 被引量:6
5
作者 JIA Liangwen REN Jie +2 位作者 NIE Dan CHEN Benzhong LV Xiaoying 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2014年第7期107-115,共9页
On the basis of the measurement data pertaining to waves, current, and sediment in February 2012 in the mouth bar of the Modaomen Estuary, the Soulsby formulae with an iterative method are applied to calculating botto... On the basis of the measurement data pertaining to waves, current, and sediment in February 2012 in the mouth bar of the Modaomen Estuary, the Soulsby formulae with an iterative method are applied to calculating bottom shear stresses (BSS) and their effect on a sediment resuspension. Swell induced BSS have been found to be the most important part of the BSS. In this study, the correlation coefficient between a wavecurrent shear stress and SSC is 0.86, and that between current shear stresses and SSC is only 0.40. The peaks of the SSC are consistent with the height and the BSS of the swell. The swell is the main mechanism for the sediment re-suspension, and the tidal current effect on sediment re-suspension is small. The peaks of the SSC are centered on the high tidal level, and the flood tide enhances the wave shear stresses and the SSC near the bottom. The critical shear stress for sediment re-suspension at the observation station is between 0.20 and 0.30 N/m2. Tidal currents are too weak to stir up the bottom sediment into the flow, but a WCI (wave-current interaction) is strong enough to re-suspend the coarse sediment. 展开更多
关键词 Modaomen Estuary WAVE-CURRENT bottom shear stresses sediment
下载PDF
Southern Jordan Coastal Sediments Quality Assessment at Aqaba Special Economic Zone/Red Sea
6
作者 Bety Al-Saqarat Mahmoud Abbas +2 位作者 Taghreed Ma’aytah Ahmad Al Shdaifat Wadah Mahmoud 《Journal of Water Resource and Protection》 2017年第1期52-64,共13页
The bottom surface sediments at the southern part of the Jordanian coast of the Gulf of Aqaba have been studied. Samples were collected from 10 m depth at nine coastal stations which are located within two main zones:... The bottom surface sediments at the southern part of the Jordanian coast of the Gulf of Aqaba have been studied. Samples were collected from 10 m depth at nine coastal stations which are located within two main zones: Marine Park Zone and Industrial Zone. Sedimentation rate, grain size oxygenation state, Loss on Ignition, hydrogen sulfide, calcium carbonate, total phosphorous, organic carbon, organic nitrogen, and heavy metals were analyzed to assess and evaluate the quality of bottom surface sediments. The sedimentation rate at the southern part of the Gulf has been affected by Khamassin winds from the south as a result of sand storm events in southern Jordan and adjacent regions. Floods and streams also played a vital role as a transportation agent of the sediments from the interstitial nearby areas to the Gulf. Also construction works played a minor role. Bottom surface sediments at the different sites were quite different in some chemical properties. Sediments from all stations other than the MSS were fine, gray-black and oxygen deficient. Sediments from the MSS and VC are whitish, better oxygenated and have higher calcium carbonate content since they are typically coral reef sediments coral reef sediments. Coral reef carbonate sediments are well known to have high organic nitrogen concentration as compared to silicate sediments, even those in close proximity. The concentration of phosphorous and calcium carbonate is attributed in the phosphate port to the phosphate by the generation of the dust and coral reef. Whilst, heavy metal concentration due to presence of major sources of metal pollution and intensive human activities. These include ship boat activities, domestic sewage discharges and phosphate rock particles from the phosphate port. 展开更多
关键词 GULF of Aqaba bottom Surface sedimentS sedimentATION Rate Heavy Metals CORAL REEFS
下载PDF
Hydro-Sedimentary Dynamics of the Grand-Popo Lagoon Located Upstream of the Mobile Embouchure “Bouche du Roy” in South-Western Benin
7
作者 Honorin Gbinibou Andemi Gérard A. F. d’Almeida +3 位作者 Moussa Bio Djara Léandre Accalogoun Rodrigue A. Adechina Christophe Kaki 《Journal of Geoscience and Environment Protection》 2021年第11期98-112,共15页
The problems of flooding, bank erosion and even the breaching of the barrier beach by the Grand-Popo lagoon are a concern in the south-western Beninese river-lagoon complex. The present study aims to improve the knowl... The problems of flooding, bank erosion and even the breaching of the barrier beach by the Grand-Popo lagoon are a concern in the south-western Beninese river-lagoon complex. The present study aims to improve the knowledge of the factors controlling the hydro-sedimentary functioning of this lagoon of Grand-Popo. It was based on bathymetric and sedimentological studies and the analysis of physical-chemical parameters of the water and allowed to know the morphology of the lagoon bottom and the distribution of sedimentary facies according to the intensity of the water current. The salinity of the lagoon waters shows a west-east gradient passing thus from 0‰ to 0.78‰ in the main direction of flow. Over the whole lagoon system, the average liquid flows vary from <span style="color:#4F4F4F;font-family:-apple-system, "font-size:16px;white-space:normal;background-color:#FFFFFF;">&#45;</span>38.499 to 159.13 m<sup>3</sup>/s. The bathymetry indicates depths varying from 0.4 to 6.5 m, revealing type V and type U lagoon bottoms which reflect acute bottom concavities marked by hollowing under the effect of strong currents or by sandy terraces resulting from the continuous input of sediments carried by the Mono River. These sediments are heterogeneously distributed in the lagoon bottom and vary from free sand to mud. Given the complexity of the factors that control the hydro-sedimentary functioning of the Grand-Popo lagoon, it is recommended that periodic hydrological and bathymetric monitoring be carried out to locate exceptional variations in water levels to prevent not only the risks of overflowing lagoon waters and the flooding that follows but also spectacular erosion of the lagoon banks. 展开更多
关键词 Grand-Popo Lagoon Hydro-sedimentary Functioning Lagoon bottoms sediments
下载PDF
Field Observation and Analysis of Wave-Current-Sediment Movement in Caofeidian Sea Area in the Bohai Bay, China 被引量:5
8
作者 左利钦 陆永军 +1 位作者 汪亚平 刘怀湘 《China Ocean Engineering》 SCIE EI CSCD 2014年第3期331-348,共18页
In order to study the mechanism of flow-sediment movement, it is essential to obtain measured data of water hydrodynamic and sediment concentration process with high spatial and temporal resolution in the bottom bound... In order to study the mechanism of flow-sediment movement, it is essential to obtain measured data of water hydrodynamic and sediment concentration process with high spatial and temporal resolution in the bottom boundary layer (BBL). Field observations were carried out in the northwest Caofeidian sea area in the Bohai Bay. Near 2 m isobath (under the lowest tidal level), a tripod system was installed with AWAC (Acoustic Wave And Current), ADCP (Acoustic Doppler Current Profilers), OBS-3A (Optical Backscatter Point Sensor), ADV (Acoustic Doppler Velocimeters), etc. The accurate measurement of the bottom boundary layer during a single tidal period was carried out, together with a long-term sediment concentration measurement under different hydrological conditions. All the measured data were used to analyze the characteristics of wave-current-sediment movement and the BBL. Analysis was performed on flow structure, shear stress, roughness, eddy viscosity and other parameters of the BBL. Two major findings were made. Firstly, from the measured data, the three-layer distribution model of the velocity profiles and eddy viscosities in the wave-current BBL are proposed in the observed sea area; secondly, the sediment movement is related closely to wind-waves in the muddy coast area where sediment is clayey silt: 1) The observed suspended sediment concentration under light wind conditions is very low, with the peak value generally smaller than 0.1 kg/m^3 and the average value being 0.03 kg/m^3; 2) The sediment concentration increases continuously under the gales over 6-7 in Beaufort scale, under a sustained wind action. The measured peak sediment concentration at 0.4 m above the seabed is 0.15-0.32 kg/m^3, and the average sediment concentration during wind-wave action is 0.08-0.18 kg/m^3, which is about 3-6 times the value under light wind conditions. The critical wave height signaling remarkable changes of sediment concentration is 0.5 m. The results show that the suspended load sediment concentration is mainly influenced by wave-induced sediment suspension. 展开更多
关键词 field observation wave-induced sediment suspension wave-current interaction bottom boundary layer (BBL) Caofeidian Bohai Bay
下载PDF
考虑桩底沉渣时沉降后浇带提前封闭时间计算方法:以秦望广场综合体工程为例
9
作者 曹化锦 陈奕扬 +2 位作者 刘聪 孙德明 胡安峰 《科学技术与工程》 北大核心 2024年第23期10039-10049,共11页
为了合理确定沉降后浇带提前封闭时间,开展了考虑桩底沉渣效应时沉降后浇带封闭时机研究工作。首先基于模型试验结果和秦望广场综合体工程的原位试桩试验结果,提出了考虑桩底沉渣效应的单桩沉降模型。基于该单桩沉降模型,根据施工过程... 为了合理确定沉降后浇带提前封闭时间,开展了考虑桩底沉渣效应时沉降后浇带封闭时机研究工作。首先基于模型试验结果和秦望广场综合体工程的原位试桩试验结果,提出了考虑桩底沉渣效应的单桩沉降模型。基于该单桩沉降模型,根据施工过程中的常见工况组合,考虑了浮荷载对单桩刚度的改变,计算得到后浇带最早可封闭时间,并分析了沉渣厚度对后浇带可封闭时间的影响。模拟结果表明:当沉渣厚度符合设计要求时,恒载、活载、浮载组合工况引起的后浇带两侧差异沉降最大,但随着沉渣厚度的增大,恒载、活载组合工况逐渐转变为控制工况;当沉渣厚度较小时,所有工况下的差异沉降均呈线性发展,此时可以通过前期沉降观测值对后期变形进行预测;当沉渣厚度较大时,后浇带可封闭时间显著延后,甚至无法提前封闭。 展开更多
关键词 高层建筑 后浇带 桩底沉渣 差异沉降
下载PDF
黄河水沙监测数据分析与模型构建
10
作者 蒲宝卿 《通化师范学院学报》 2024年第4期23-29,共7页
对黄河水沙监测数据进行分析研究,使用相关性分析、回归分析、Mann-Kendall非参数检验、奇异谱分析等方法构建数学模型.分析含沙量与各因素的关系、水沙通量变化规律、水沙通量趋势预测、河底高程变化规律预测等问题,并提出水沙通量监... 对黄河水沙监测数据进行分析研究,使用相关性分析、回归分析、Mann-Kendall非参数检验、奇异谱分析等方法构建数学模型.分析含沙量与各因素的关系、水沙通量变化规律、水沙通量趋势预测、河底高程变化规律预测等问题,并提出水沙通量监测的优化策略.在环境治理、调水调沙、防洪减灾等方面具有一定的现实意义. 展开更多
关键词 水沙通量 奇异谱分析 河底高程 调水调沙 时间序列分析
下载PDF
混凝土灌注桩钻芯检测常见问题分析 被引量:2
11
作者 王小威 胡彩侠 《广州建筑》 2024年第7期39-43,共5页
对于普通抽芯,借助孔内摄像技术辅助分析了灌注桩钻芯检测中检测桩桩长的确定、桩身混凝土芯样严重蜂窝、连续沟槽、破碎及松散的区分辨别及判定、桩身水平裂缝和竖向裂缝缺陷位置和范围的确定、桩底沉渣厚度综合判定以及持力层溶洞位... 对于普通抽芯,借助孔内摄像技术辅助分析了灌注桩钻芯检测中检测桩桩长的确定、桩身混凝土芯样严重蜂窝、连续沟槽、破碎及松散的区分辨别及判定、桩身水平裂缝和竖向裂缝缺陷位置和范围的确定、桩底沉渣厚度综合判定以及持力层溶洞位置及溶洞深度的确定等常见问题,进而对缺陷桩给出合理且精确的判定。本文对钻芯检测缺陷桩的判定,具有一定的指导意义。 展开更多
关键词 钻芯检测 孔内摄像技术 裂缝 桩底沉渣 溶洞
下载PDF
基于浅地层剖面数据和改进地声模型的底质反演方法
12
作者 孙振银 王虎 李冠霖 《海洋地质与第四纪地质》 CAS CSCD 北大核心 2024年第1期170-178,共9页
浅地层剖面仪发射的声脉冲能够穿透海底面进入沉积层内部,其回波中携带了丰富的底质信息。地声模型是底质声学与物理性质关系的数学描述,广泛用于海底声学与地声反演研究。本文通过对浅地层剖面数据的处理、解译得到海底反射系数,与考... 浅地层剖面仪发射的声脉冲能够穿透海底面进入沉积层内部,其回波中携带了丰富的底质信息。地声模型是底质声学与物理性质关系的数学描述,广泛用于海底声学与地声反演研究。本文通过对浅地层剖面数据的处理、解译得到海底反射系数,与考虑底质松密影响的改进Biot-Stoll模型相结合,提出底质反演新方法并开展实例验证。研究结果表明:通过对浅地层剖面原始记录的读取、解译,提取反射波振幅,并结合设备声源级,可有效求取海底反射系数。通过引入相对密度改进孔隙度计算公式,进而在基于Biot-Stoll模型构建海底反射系数和底质平均粒径关系过程中进一步考虑了底质松密的影响。基于山东威海某海域及文献的算例均显示,本文提出的改进地声模型可缩小底质反演与实测结果之间的相对误差、提升基于浅地层剖面数据的海底底质地声反演精度。 展开更多
关键词 浅地层剖面 底质反演 Biot-Stoll模型 海底反射系数 平均粒径
下载PDF
孔内摄像技术在钻芯检测中的应用
13
作者 王小威 《广东建材》 2024年第11期70-73,共4页
本文采用孔内摄像法技术对灌注桩普通钻芯和界面抽芯的检测结果进行辅助验证,从裂缝缺陷、桩底沉渣厚度、持力层缺陷以及界面抽芯的桩端部分的混凝土性状、桩底沉渣厚度等多角度进行验证和对比,结果表明孔内摄像技术能有效弥补钻芯法在... 本文采用孔内摄像法技术对灌注桩普通钻芯和界面抽芯的检测结果进行辅助验证,从裂缝缺陷、桩底沉渣厚度、持力层缺陷以及界面抽芯的桩端部分的混凝土性状、桩底沉渣厚度等多角度进行验证和对比,结果表明孔内摄像技术能有效弥补钻芯法在机械破损、水平裂缝判别等方面的不足问题以及准确地识别桩身缺陷和桩底沉渣厚度。孔内摄像技术与钻芯法的综合应用,可增强钻芯检测结果的科学性和准确性。 展开更多
关键词 孔内摄像技术 普通抽芯 桩底沉渣 裂缝缺陷 持力层缺陷
下载PDF
基于深海矿车-稀软土相互作用的矿车触底过程分析
14
作者 李宗晏 陈旭光 +2 位作者 刘学麟 刘茜茜 丁聪 《海洋工程》 CSCD 北大核心 2024年第5期178-190,共13页
多金属结核赋存在深海5.0 km左右的平原区域,该区域的稀软沉积物含水率高、承载力低。深海采矿车在触底过程中,矿车下方稀软沉积物受到冲击后易发生扰动破坏,从而极易引发矿车沉陷,这将严重影响矿车的正常作业,甚至会导致停机。矿车是... 多金属结核赋存在深海5.0 km左右的平原区域,该区域的稀软沉积物含水率高、承载力低。深海采矿车在触底过程中,矿车下方稀软沉积物受到冲击后易发生扰动破坏,从而极易引发矿车沉陷,这将严重影响矿车的正常作业,甚至会导致停机。矿车是否沉陷与其触底后的应力分布形式密切相关,但尚无理论对其进行分析。通过开展采矿模型车不同触底速度下的触底试验,揭示了矿车触底后下方土体竖向应力随时间的变化规律及分布范围。在传统理论基础上,推导并验证了一种考虑履齿影响的竖向应力值的理论公式。研究发现,触底后下方土体的应力值会快速增长并趋稳定,且达到稳定应力值所需时间与触底速度成反比。随着触底速度增大,矿车下方应力泡形状会从平滑单峰向单峰两侧有平台的形状变化,车体正下方的应力传播得最远。相对于平板,履齿板应力影响深度显著增加。经误差分析,改进的理论公式比传统理论与试验结果吻合效果更好,提升了深海矿车触底后应力计算精度。文中研究围绕矿车触底后的海床应力分布进行了一系列讨论,可为深海矿车低扰动、防沉陷设计提供理论参考。 展开更多
关键词 深海采矿车 触底速度 应力分布 稀软沉积物 应力云图
下载PDF
3种沉水植物-沉积型微生物燃料电池对黑臭水体修复的研究
15
作者 赵亚楠 毛羽丰 王剑 《广东化工》 CAS 2024年第18期127-129,158,共4页
沉水植物-沉积型微生物燃料电池(Submerged plantsediment microbialfuelcell,SP-SMFC)是目前解决修复水体复黑臭最有发展前景的技术之一。以黑臭水体底泥为底质,构建了3种不同的沉水植物与沉积型微生物燃料电池耦合系统:分别为篦齿眼子... 沉水植物-沉积型微生物燃料电池(Submerged plantsediment microbialfuelcell,SP-SMFC)是目前解决修复水体复黑臭最有发展前景的技术之一。以黑臭水体底泥为底质,构建了3种不同的沉水植物与沉积型微生物燃料电池耦合系统:分别为篦齿眼子菜-沉积型微生物燃料电池(标记为SP-SMFC1)、矮生苦草-沉积型微生物燃料电池(标记为SP-SMFC2)和金鱼藻-沉积型微生物燃料电池(标记为SP-SMFC3),为对照还构建了无植物的对照组(标记为SMFC)。结果表明:所构建的实验系统经驯化后能够稳定运行;引入沉水植物可提高系统输出电压,其中SP-SMFC2系统平均最高输出电压最大为0.659V;各实验组对底泥和上覆水的有机质和氮磷去除效果明显;构筑的系统可以有效防止水体复黑臭的发生。 展开更多
关键词 沉水植物 沉积物微生物燃料电池 输出电压 底泥修复 上覆水
下载PDF
太湖北部底泥中氮、磷的空间变化和环境意义 被引量:47
16
作者 袁旭音 陈骏 +2 位作者 陶于祥 季峻峰 许乃政 《地球化学》 CAS CSCD 北大核心 2002年第4期321-328,共8页
以太湖底泥为研究对象,通过分析不同形态N、P的含量,揭示太湖北部底泥N、P的区域和垂向变化特征,探讨了主要营养元素的环境意义。太湖北部底泥N、P的高值区分布在五里湖、梅梁湾北部和竺山湖北部,有效氮的分布与总氮的分布一致。相关分... 以太湖底泥为研究对象,通过分析不同形态N、P的含量,揭示太湖北部底泥N、P的区域和垂向变化特征,探讨了主要营养元素的环境意义。太湖北部底泥N、P的高值区分布在五里湖、梅梁湾北部和竺山湖北部,有效氮的分布与总氮的分布一致。相关分析表明,有效磷与无机磷具有很好的正相关性,N、P的含量还与粘土矿物的含量成正比。柱状样的N、P垂直变化显示,数千年人类的活动并未明显影响底泥中N、P的含量,而在近代则明显增加。底泥中大量的N、P主要来自生活污水,其次是农田肥料和围网养殖。 展开更多
关键词 底泥 环境意义 太湖 分布 人类活动
下载PDF
钻孔灌注桩护壁泥浆对桩基承载性能的影响 被引量:40
17
作者 吴鹏 龚维明 +1 位作者 任伟新 游庆仲 《岩土工程学报》 EI CAS CSCD 北大核心 2008年第9期1327-1332,共6页
为了解钻孔灌注桩护壁泥浆对桩基承载性能的影响,分析了钻孔灌注桩护壁泥浆的功能以及对桩基承载性能影响的机理。通过对国内某大型公路桥梁大量的桩基静载试验结果分析,可以得出结论:护壁泥浆质量的好坏将直接影响到桩端沉渣厚度和桩... 为了解钻孔灌注桩护壁泥浆对桩基承载性能的影响,分析了钻孔灌注桩护壁泥浆的功能以及对桩基承载性能影响的机理。通过对国内某大型公路桥梁大量的桩基静载试验结果分析,可以得出结论:护壁泥浆质量的好坏将直接影响到桩端沉渣厚度和桩侧泥皮厚度,进而影响桩基承载性能,因此在计算分析时需要通过合适的方式考虑。最后,总结了优质泥浆的配置原则、配置方法、泥浆施工管理和安排等经验。 展开更多
关键词 钻孔灌注桩 护壁泥浆 桩端沉渣 桩侧泥皮
下载PDF
徐州市荆马河底泥重金属污染特征研究 被引量:14
18
作者 韩宝平 王晓 +4 位作者 冯启言 张显龙 魏颖 周东来 丁毅 《中国矿业大学学报》 EI CAS CSCD 北大核心 2003年第2期138-140,共3页
徐州市北郊工业区 60余家工业企业每天约有 1 0万 t污水排入荆马河 .成分复杂的工业废水中的重金属元素在随河水迁移的过程中 ,通过各种物理、化学作用过程 ,迅速转入底泥 ,造成了荆马河底泥的重金属污染 .针对这一问题 ,从上游至下游... 徐州市北郊工业区 60余家工业企业每天约有 1 0万 t污水排入荆马河 .成分复杂的工业废水中的重金属元素在随河水迁移的过程中 ,通过各种物理、化学作用过程 ,迅速转入底泥 ,造成了荆马河底泥的重金属污染 .针对这一问题 ,从上游至下游采集了 1 5个底泥样并进行了测试分析 ,结果表明 ,各种重金属质量分数的最大值分别为 :Cu,383× 1 0 -6;Pb,5 86.9× 1 0 -6;Zn,61 39×1 0 -6;总 Cr,2 8.3× 1 0 -3 ;Mn,794.5 × 1 0 -6;Co,2 4 .46× 1 0 -6;Ni,5 0 .33× 1 0 -6;V,99.6× 1 0 -6.运用地积累指数法评价了底泥的重金属污染程度 ,结果表明荆马河中、下游地段底泥已受到中等到强重金属污染 . 展开更多
关键词 重金属 底泥 地积累指数 污染 荆马河 徐州市
下载PDF
河流底泥冲刷悬浮对水质影响途径的实验研究 被引量:36
19
作者 李剑超 褚君达 丰华丽 《长江流域资源与环境》 CAS CSSCI CSCD 北大核心 2002年第2期137-140,共4页
进入天然水体的大部分污染物会在河流、湖泊底部形成富含各种污染物的沉积物层 ,在一定的水流流速及紊动作用下发生底泥冲刷及再悬浮。大量的污染物被重新释放出来造成河湖水体的二次污染 ,这种情况是外源污染得到治理后影响水质的主要... 进入天然水体的大部分污染物会在河流、湖泊底部形成富含各种污染物的沉积物层 ,在一定的水流流速及紊动作用下发生底泥冲刷及再悬浮。大量的污染物被重新释放出来造成河湖水体的二次污染 ,这种情况是外源污染得到治理后影响水质的主要因素。建立这种影响条件下的水质模型需要对沉积物的污染释放机理有充分的认识。采用富含污染物的天然河湖底泥 ,通过衡温静态培养等手段 ,在不同的水力条件 ,瞬间悬浮、连续悬浮和静止状态下 ,研究了污染物的释放 ,并对实验结果进行了分析。确定了底泥冲刷悬浮影响水质的主要途径 ,即在底泥间隙水污染物浓度接近平衡时 ,其与上层大水体的混合作用是影响水质的主要作用 ,其次是下部底泥的静态释放 ,而悬浮颗粒的污染物扩散释放作用则较小 。 展开更多
关键词 河流底泥 冲刷悬浮 污染物释放 水质 间隙水 COD
下载PDF
广东茂名大放鸡海区文昌鱼分布与底质关系 被引量:16
20
作者 冯波 卢伙胜 陈文河 《热带海洋学报》 CAS CSCD 北大核心 2006年第2期18-23,共6页
利用2003年8月至2004年5月南海大放鸡岛周围水域4个季度采集的文昌鱼Brarchiostoma belcheni和砂样,对文昌鱼进行生物学测定和对干燥后的砂样用12、24、50、100、200和300目等6种筛眼的网筛分选,取得不同粒径砂粒的百分比数据,以砂样数... 利用2003年8月至2004年5月南海大放鸡岛周围水域4个季度采集的文昌鱼Brarchiostoma belcheni和砂样,对文昌鱼进行生物学测定和对干燥后的砂样用12、24、50、100、200和300目等6种筛眼的网筛分选,取得不同粒径砂粒的百分比数据,以砂样数据分别与文昌鱼的平均生物量和资源密度数据配对聚类,发现砂粒粒径为0.36—0.78mm的分布与文昌鱼分布最为密切,且无季节性差别;采用SPSS10.0进行相关性检验表明砂粒粒径为0.36—0.78mm的砂粒百分比与文昌鱼分布相关性高度显著。曼-惠特尼U检验表明砂粒粒径为0.36—0.78mm百分比>50%时文昌鱼密度显著高于粒径百分比≤50%时文昌鱼密度;文昌鱼资源密度和平均生物量分别与砂粒粒径为0.36—0.78mm的砂粒百分比等值线进行叠图分析发现,文昌鱼的季节性移动与砂粒百分比等值线的移动基本一致;利用文昌鱼的资源密度与砂粒粒径为0.36—0.78mm砂样的百分比进行曲线拟合分别得到幂函数曲线、混合曲线、等比级数曲线、指数曲线等4个回归方程,回归相关检验均高度显著,但以混合曲线、等比级数曲线和指数曲线拟合度最好,误差概率最低。 展开更多
关键词 文昌鱼 Brarchiostoma belcheni 分布 底质 关系
下载PDF
上一页 1 2 17 下一页 到第
使用帮助 返回顶部