Pub Date : 2011-06-24DOI: 10.1109/RSETE.2011.5965809
Xiong Xia, Liangliang Dong
A soil arching theory and a model was put up for the thrust's transfer mechanism and the part acting on the presstressed anti-sliding pile can be computed. Aiming at the existing problems in the method for computing anti-sliding pile with prestressed anchoring cable, an improved method is proposed in this paper. According to the actual construction process and mechanical condition of the pile and the prestressed anchoring cable, the internal force of the structure should be computed in two steps. Firstly, the pile under the prestress of the anchoring cable and a part of sliding thrust will be taken into account in computation. It should be pointed out that the subgrade reaction over the slip surface behind the pile should also be taken into consideration in the calculation of the prestress. Secondly, the pile under the computed sliding thrust should be calculated and the concerted deformation of the pile and the anchoring cable must be considered. A model test on the character of the internal force of prestressed anti-sliding pile is conducted, and the pile is calculated using the improved method and the existing method. The comparison between the computation results and the test results shows that the satisfying results can be obtained by the improved method.
{"title":"Study on pile-soil relationship based on soil arching model","authors":"Xiong Xia, Liangliang Dong","doi":"10.1109/RSETE.2011.5965809","DOIUrl":"https://doi.org/10.1109/RSETE.2011.5965809","url":null,"abstract":"A soil arching theory and a model was put up for the thrust's transfer mechanism and the part acting on the presstressed anti-sliding pile can be computed. Aiming at the existing problems in the method for computing anti-sliding pile with prestressed anchoring cable, an improved method is proposed in this paper. According to the actual construction process and mechanical condition of the pile and the prestressed anchoring cable, the internal force of the structure should be computed in two steps. Firstly, the pile under the prestress of the anchoring cable and a part of sliding thrust will be taken into account in computation. It should be pointed out that the subgrade reaction over the slip surface behind the pile should also be taken into consideration in the calculation of the prestress. Secondly, the pile under the computed sliding thrust should be calculated and the concerted deformation of the pile and the anchoring cable must be considered. A model test on the character of the internal force of prestressed anti-sliding pile is conducted, and the pile is calculated using the improved method and the existing method. The comparison between the computation results and the test results shows that the satisfying results can be obtained by the improved method.","PeriodicalId":6296,"journal":{"name":"2011 International Conference on Remote Sensing, Environment and Transportation Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78742287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-06-24DOI: 10.1109/RSETE.2011.5964490
Jun Ju, Zhi-bin Liu
Researchers at home and abroad are mainly focused on the bearing capacity, effects of soil plug and pile driving of PHC pipe piles. However, little attention is paid to property variation of soil before and after their installation especially when different installation technology is adopted. For further study of engineering property of PHC pipe pile composite foundation, the property variation of soils among PHC pile piles before and after their installation was studied with CPTU in-situ test technique in northern connection project of Chongqi Bridge expressway. The results indicate that, regardless of the pile installation, either hammer percussion method or static pressure method, several physical and mechanical parameters of soils among PHC piles were increased while both the consolidation coefficient and permeability coefficient of soft soil decreased one year after installation. For hammer percussion method, during the process of pile driving, soils around the pile accept a strong non-uniform drag effect, which makes the soil compacted in local area significantly. So the CPTU tip resistance of hammer percussion method is often significantly higher than that of static pressure method in local areas, which also leads to that the average deduced parameters of hammer percussion method such as the relative density and the effective internal friction angle of sand or undrained shear strength of cohesive soil are usually higher. Under the condition of same geology and design parameters, the skin friction of soils around pile in hammer percussion method is generally lower than that of static pressure method. This is of great significance for the PHC pipe pile which used as friction pile and for the bearing characteristic of PHC pipe pile composite foundation.
{"title":"Engineering property evaluation of soil before and after PHC pipe pile installation","authors":"Jun Ju, Zhi-bin Liu","doi":"10.1109/RSETE.2011.5964490","DOIUrl":"https://doi.org/10.1109/RSETE.2011.5964490","url":null,"abstract":"Researchers at home and abroad are mainly focused on the bearing capacity, effects of soil plug and pile driving of PHC pipe piles. However, little attention is paid to property variation of soil before and after their installation especially when different installation technology is adopted. For further study of engineering property of PHC pipe pile composite foundation, the property variation of soils among PHC pile piles before and after their installation was studied with CPTU in-situ test technique in northern connection project of Chongqi Bridge expressway. The results indicate that, regardless of the pile installation, either hammer percussion method or static pressure method, several physical and mechanical parameters of soils among PHC piles were increased while both the consolidation coefficient and permeability coefficient of soft soil decreased one year after installation. For hammer percussion method, during the process of pile driving, soils around the pile accept a strong non-uniform drag effect, which makes the soil compacted in local area significantly. So the CPTU tip resistance of hammer percussion method is often significantly higher than that of static pressure method in local areas, which also leads to that the average deduced parameters of hammer percussion method such as the relative density and the effective internal friction angle of sand or undrained shear strength of cohesive soil are usually higher. Under the condition of same geology and design parameters, the skin friction of soils around pile in hammer percussion method is generally lower than that of static pressure method. This is of great significance for the PHC pipe pile which used as friction pile and for the bearing characteristic of PHC pipe pile composite foundation.","PeriodicalId":6296,"journal":{"name":"2011 International Conference on Remote Sensing, Environment and Transportation Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78771947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-06-24DOI: 10.1109/RSETE.2011.5964323
Jin-li Li, W. Che
As one of the urban infrastructure, parking lot holds a large proportion in the urban impervious area. Characteristics of parking lots and their negative effects to environment ware analyzed. The main pollutants in parking lot runoff and the event mean concentration of those pollutants ware listed. Representative stormwater management technologies in parking lot ware introduced, such as permeable pavements, grass swale and rain garden. A case study of retrofits in parking lot was presented briefly. It was pointed out that new stormwater management practices should be adapted to the design and construction of parking lot, and the resource-saving and environment-friendly parking lot incorporated with stormwater management practices should be established as soon as possible in Chinese cities.
{"title":"Non-piont source pollution and stormwater management practices of parking lot","authors":"Jin-li Li, W. Che","doi":"10.1109/RSETE.2011.5964323","DOIUrl":"https://doi.org/10.1109/RSETE.2011.5964323","url":null,"abstract":"As one of the urban infrastructure, parking lot holds a large proportion in the urban impervious area. Characteristics of parking lots and their negative effects to environment ware analyzed. The main pollutants in parking lot runoff and the event mean concentration of those pollutants ware listed. Representative stormwater management technologies in parking lot ware introduced, such as permeable pavements, grass swale and rain garden. A case study of retrofits in parking lot was presented briefly. It was pointed out that new stormwater management practices should be adapted to the design and construction of parking lot, and the resource-saving and environment-friendly parking lot incorporated with stormwater management practices should be established as soon as possible in Chinese cities.","PeriodicalId":6296,"journal":{"name":"2011 International Conference on Remote Sensing, Environment and Transportation Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78918810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-06-24DOI: 10.1109/RSETE.2011.5966002
S. Dai, Min Wang, Jing Qiu, Hui Yang, Fu-Hua Wang
A method was developed for simultaneously determination of four arsenic speciation including trivalent arsenic (As (III)), pentavalent arsenic (As (V)), monomethylarsinic acid (MMA) and dimethylarsinic acid (DMA) in fruits and vegetables. Arsenic speciation in samples were extracted with methanol/water (50/50, v/v) after samples were dried at 105°C, and then detected by high performance liquid chromatography-hydride generation-atomic fluorescence spectrometry (HPLC-HG-AFS). The recoveries of four arsenic speciation were 81.7%∼103.9% with RSD of 0.88%∼5.03%, and detection limits were 0.8∼2.0 µg/kg. This indicates that the developed method has good accuracy and high sensitivity. The method was then applied to detect eleven types of fruits and vegetables samples randomly purchased from supermarkets. The analytical results showed that the main arsenic speciation were As (III) and As (V) in vegetables and As (III) in fruits. The concentrations of As (III) in vegetables were obviously higher than those in fruits.
{"title":"Speciation analysis of arsenic in fruits and vegetables by high performance liquid chromatography-hydride generation-atomic fluorescence spectrometry with ultrasonic extraction","authors":"S. Dai, Min Wang, Jing Qiu, Hui Yang, Fu-Hua Wang","doi":"10.1109/RSETE.2011.5966002","DOIUrl":"https://doi.org/10.1109/RSETE.2011.5966002","url":null,"abstract":"A method was developed for simultaneously determination of four arsenic speciation including trivalent arsenic (As (III)), pentavalent arsenic (As (V)), monomethylarsinic acid (MMA) and dimethylarsinic acid (DMA) in fruits and vegetables. Arsenic speciation in samples were extracted with methanol/water (50/50, v/v) after samples were dried at 105°C, and then detected by high performance liquid chromatography-hydride generation-atomic fluorescence spectrometry (HPLC-HG-AFS). The recoveries of four arsenic speciation were 81.7%∼103.9% with RSD of 0.88%∼5.03%, and detection limits were 0.8∼2.0 µg/kg. This indicates that the developed method has good accuracy and high sensitivity. The method was then applied to detect eleven types of fruits and vegetables samples randomly purchased from supermarkets. The analytical results showed that the main arsenic speciation were As (III) and As (V) in vegetables and As (III) in fruits. The concentrations of As (III) in vegetables were obviously higher than those in fruits.","PeriodicalId":6296,"journal":{"name":"2011 International Conference on Remote Sensing, Environment and Transportation Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78928481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-06-24DOI: 10.1109/RSETE.2011.5964262
Chonghui Gao, Jun Zhang
With the development of society and technology, human beings on the natural environment sphere of influence and strength are constantly increasing. It causes more and more regional ecological environment problems. To protect and improve the ecological environment has become the major issues which the most world countries and areas paid more and more attention to. Ecological sensitivity analysis is the ecological strategy which the world countries and areas widely adopted currently. The spatial ecological sensitivity distribution had been divided in Wuhan city based on RS and GIS; and the distribution was classified into five different grades (best sensitivity region, better sensitivity region, sensitivity region, weaker sensitivity region, non-sensitivity region). On this basis, the corresponding protecting policies were put forward, thus the paper provided scientific foundation for rational urban industry distribution and regional eco-environment protection in future.
{"title":"Ecological sensitivity analysis in Wuhan city based on RS and GIS","authors":"Chonghui Gao, Jun Zhang","doi":"10.1109/RSETE.2011.5964262","DOIUrl":"https://doi.org/10.1109/RSETE.2011.5964262","url":null,"abstract":"With the development of society and technology, human beings on the natural environment sphere of influence and strength are constantly increasing. It causes more and more regional ecological environment problems. To protect and improve the ecological environment has become the major issues which the most world countries and areas paid more and more attention to. Ecological sensitivity analysis is the ecological strategy which the world countries and areas widely adopted currently. The spatial ecological sensitivity distribution had been divided in Wuhan city based on RS and GIS; and the distribution was classified into five different grades (best sensitivity region, better sensitivity region, sensitivity region, weaker sensitivity region, non-sensitivity region). On this basis, the corresponding protecting policies were put forward, thus the paper provided scientific foundation for rational urban industry distribution and regional eco-environment protection in future.","PeriodicalId":6296,"journal":{"name":"2011 International Conference on Remote Sensing, Environment and Transportation Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78198964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-06-24DOI: 10.1109/RSETE.2011.5965677
J. Zeng, Gang Chen, H. Ren, Chenfeng Li, Hao Yu
The deepwater semi-submersible drilling unit will accept frequently the anchoring of supplying boat during service. Considering the possibility of accident in case of unquiet sea state or other miss-operation, the stern of supply boat may impact to the column of platform. Collision between platform and vessel is a complicated non-linear dynamic response with large impact force in a very short time. The safety criteria require that the structure of drilling unit should resist a collision with certain laver without any sever damage to lose the functionality and general safety of drilling unit. Based on the non-linear finite element method, the approach of predicting dynamic response in the collision process is obtained. Based on structural collision simulation results, the resistance capacity and the safety level of drilling unit against collision by supply boat are evaluated.
{"title":"Collision response analysis between deepwater semi-submersible platform and vessel","authors":"J. Zeng, Gang Chen, H. Ren, Chenfeng Li, Hao Yu","doi":"10.1109/RSETE.2011.5965677","DOIUrl":"https://doi.org/10.1109/RSETE.2011.5965677","url":null,"abstract":"The deepwater semi-submersible drilling unit will accept frequently the anchoring of supplying boat during service. Considering the possibility of accident in case of unquiet sea state or other miss-operation, the stern of supply boat may impact to the column of platform. Collision between platform and vessel is a complicated non-linear dynamic response with large impact force in a very short time. The safety criteria require that the structure of drilling unit should resist a collision with certain laver without any sever damage to lose the functionality and general safety of drilling unit. Based on the non-linear finite element method, the approach of predicting dynamic response in the collision process is obtained. Based on structural collision simulation results, the resistance capacity and the safety level of drilling unit against collision by supply boat are evaluated.","PeriodicalId":6296,"journal":{"name":"2011 International Conference on Remote Sensing, Environment and Transportation Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78243563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-06-24DOI: 10.1109/RSETE.2011.5964091
Zhenhe Chen, Bin Xue, Wentao Zhao, Linxia Zhang, Liquan Sun, Aiqin Luo
High porosity lysozyme imprinted polyacrylamide polymers were synthesized by introducing nano-silica particles as pore-forming agent which could produce a lot of nano-pores after removing by HF etching. The adsorption capacity of the polymers with pore-forming agent (17.1mg/g) is much larger than those without adding silica (7.54 mg/g). The polymer in the form of “bulk” has pretty good mechanic strength which can overcome swelling and softness of reported crushed imprinted polymers and could be used in large-scale enrichment and separation of lysozyme from raw biological materials.
{"title":"High porosity lysozyme imprinted polymers","authors":"Zhenhe Chen, Bin Xue, Wentao Zhao, Linxia Zhang, Liquan Sun, Aiqin Luo","doi":"10.1109/RSETE.2011.5964091","DOIUrl":"https://doi.org/10.1109/RSETE.2011.5964091","url":null,"abstract":"High porosity lysozyme imprinted polyacrylamide polymers were synthesized by introducing nano-silica particles as pore-forming agent which could produce a lot of nano-pores after removing by HF etching. The adsorption capacity of the polymers with pore-forming agent (17.1mg/g) is much larger than those without adding silica (7.54 mg/g). The polymer in the form of “bulk” has pretty good mechanic strength which can overcome swelling and softness of reported crushed imprinted polymers and could be used in large-scale enrichment and separation of lysozyme from raw biological materials.","PeriodicalId":6296,"journal":{"name":"2011 International Conference on Remote Sensing, Environment and Transportation Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78452624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-06-24DOI: 10.1109/RSETE.2011.5964018
Xudong Sun, Bing Yang
In order to implement the remote sensing applied in land use research, we use a series of remote sensing image processing commercial software to extract land use/land cover information. The article are based on compare and analyze the ability of identify information of land use and land cover between two software (Erdas imagine 8.5 and ENVI4.1) which using the same classification method in a imagine. The results showed that the ability of identify information between two software are different. And use ENVI 4.1 can gain satisfied result. The land use and land cover information in the research region was extracted is fit for use the ENVI 4.1 software.
{"title":"Accuracy analysis for classification of land use/land cover based on different imagine software","authors":"Xudong Sun, Bing Yang","doi":"10.1109/RSETE.2011.5964018","DOIUrl":"https://doi.org/10.1109/RSETE.2011.5964018","url":null,"abstract":"In order to implement the remote sensing applied in land use research, we use a series of remote sensing image processing commercial software to extract land use/land cover information. The article are based on compare and analyze the ability of identify information of land use and land cover between two software (Erdas imagine 8.5 and ENVI4.1) which using the same classification method in a imagine. The results showed that the ability of identify information between two software are different. And use ENVI 4.1 can gain satisfied result. The land use and land cover information in the research region was extracted is fit for use the ENVI 4.1 software.","PeriodicalId":6296,"journal":{"name":"2011 International Conference on Remote Sensing, Environment and Transportation Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75025013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-06-24DOI: 10.1109/RSETE.2011.5964514
Long Ning, Ping Chen, Xuelei Wang
Water resource security is a globally environmental problem. This study examines three stages through which the rivers and lakes in Jianghan Plain has gone. 1) Before Holocene, merely affected by climate and Geologic structures, the lake water and river water exchanged freely. 2) In early and middle Holocene, water exchange between the lakes and rivers remained unrestrained, but the minor impact from human activities on their exchange had emerged. 3) Since late Holocene the water exchange between the lakes and rivers has been controlled predominantly by human activities and less by nature factors. Therefore, the water circulation system in the Jianghan Plain has changed, which partly aggravated the increasing of water disasters, reduced the self-purification capacity of water bodies, damaged the development of aquatic ecosystems, and endangered the water security in the Jianghan lake area of Hubei province.
{"title":"Impact of the dynamic relation between lakes and rivers on water resource security in Jianghan Plain region of Hubei province","authors":"Long Ning, Ping Chen, Xuelei Wang","doi":"10.1109/RSETE.2011.5964514","DOIUrl":"https://doi.org/10.1109/RSETE.2011.5964514","url":null,"abstract":"Water resource security is a globally environmental problem. This study examines three stages through which the rivers and lakes in Jianghan Plain has gone. 1) Before Holocene, merely affected by climate and Geologic structures, the lake water and river water exchanged freely. 2) In early and middle Holocene, water exchange between the lakes and rivers remained unrestrained, but the minor impact from human activities on their exchange had emerged. 3) Since late Holocene the water exchange between the lakes and rivers has been controlled predominantly by human activities and less by nature factors. Therefore, the water circulation system in the Jianghan Plain has changed, which partly aggravated the increasing of water disasters, reduced the self-purification capacity of water bodies, damaged the development of aquatic ecosystems, and endangered the water security in the Jianghan lake area of Hubei province.","PeriodicalId":6296,"journal":{"name":"2011 International Conference on Remote Sensing, Environment and Transportation Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75089074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-06-24DOI: 10.1109/RSETE.2011.5965028
Gang Liu, Pu-ling Liu, Qiong Zhang, Wennian Xu
It is important approach to recognize natural evolution of environment on the Chinese Loess Plateau that researches on evolution of loess landform and soil erosion in the Holocene. In this study, radiocarbon age of soil, loess deposition rate and magnetic susceptibility soil from YCT and YCS profiles which respectively located on loess tableland and an adjacent slope in Yanchang County in northern Shaanxi, were used to reconstruct the landform at about 12000 a B.P. on the slope. The results indicated that the average loess deposition rate of YCT profile in the Holocene was 0.0153 cm/a, and that of YCS profile was 0.0162cm/a during 12295∼20416 a B.P‥ The slope landform had formed before about 12000 a B.P., but its gradient was smaller than the modern slope. So the soil erosion rate greater than the loess deposition rate on the slope, which was the comprehensive result of natural erosion and artificial acceleration erosion. It was proved that this method could be used to quantificational research on loess landform and soil erosion in the geological period, and provided a new idea and method in this study area.
全新世黄土地貌与土壤侵蚀演变研究是认识中国黄土高原环境自然演变的重要途径。本文利用陕北延长县黄土塬区及其相邻边坡的YCT和YCS剖面的土壤放射性碳年龄、黄土沉积速率和磁化率，重建了该边坡约12000 a B.P.的地貌。结果表明，YCT剖面在全新世的平均黄土沉积速率为0.0153 cm/a, YCS剖面在12295 ~ 20416 a b.p.之间的平均黄土沉积速率为0.0162cm/a，该斜坡地貌形成于约12000 a b.p.之前，但其坡度小于现代斜坡。坡面土壤侵蚀速率大于黄土沉积速率，是自然侵蚀和人工加速侵蚀综合作用的结果。结果表明，该方法可用于地质时期黄土地貌与土壤侵蚀的定量研究，为黄土地貌与土壤侵蚀的定量研究提供了新的思路和方法。
{"title":"Quantificational research on the slope development of loess tableland in the Holocene","authors":"Gang Liu, Pu-ling Liu, Qiong Zhang, Wennian Xu","doi":"10.1109/RSETE.2011.5965028","DOIUrl":"https://doi.org/10.1109/RSETE.2011.5965028","url":null,"abstract":"It is important approach to recognize natural evolution of environment on the Chinese Loess Plateau that researches on evolution of loess landform and soil erosion in the Holocene. In this study, radiocarbon age of soil, loess deposition rate and magnetic susceptibility soil from YCT and YCS profiles which respectively located on loess tableland and an adjacent slope in Yanchang County in northern Shaanxi, were used to reconstruct the landform at about 12000 a B.P. on the slope. The results indicated that the average loess deposition rate of YCT profile in the Holocene was 0.0153 cm/a, and that of YCS profile was 0.0162cm/a during 12295∼20416 a B.P‥ The slope landform had formed before about 12000 a B.P., but its gradient was smaller than the modern slope. So the soil erosion rate greater than the loess deposition rate on the slope, which was the comprehensive result of natural erosion and artificial acceleration erosion. It was proved that this method could be used to quantificational research on loess landform and soil erosion in the geological period, and provided a new idea and method in this study area.","PeriodicalId":6296,"journal":{"name":"2011 International Conference on Remote Sensing, Environment and Transportation Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72616439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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