Pub Date : 2011-05-20DOI: 10.1109/ISWREP.2011.5893367
G. Jia, Bao-Lin Zhang, Z. Wu, Fangqing Chen
Microbial biomass, organic carbon (OC), total nitrogen (TN), and microbial biomass C (MBC), N (MBN) in soil were determined at the different ages of Citrus in Three Gorges Reservoir area, China. The results showed that pH increased readily with age of citrus tree, that with age OC increased readily, whereas MBC, MBN, MBC/OC and MBN/TN increased in soil increased quickly, and tended to be highest contents under 20-year citrus tree, after that they decreased. TN in soil was lowest in 20-year citrus site, and was highest in 30-year citrus site. The results suggested that although the increase in the age of citrus favor to accumulation OC, the degree of immobilization of carbon and nitrogen and substrate available is highest before 20-year citrus.
{"title":"Microbial biomass and nutrients in soil at the different ages of Citrus in Three Gorges Reservoir area","authors":"G. Jia, Bao-Lin Zhang, Z. Wu, Fangqing Chen","doi":"10.1109/ISWREP.2011.5893367","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893367","url":null,"abstract":"Microbial biomass, organic carbon (OC), total nitrogen (TN), and microbial biomass C (MBC), N (MBN) in soil were determined at the different ages of Citrus in Three Gorges Reservoir area, China. The results showed that pH increased readily with age of citrus tree, that with age OC increased readily, whereas MBC, MBN, MBC/OC and MBN/TN increased in soil increased quickly, and tended to be highest contents under 20-year citrus tree, after that they decreased. TN in soil was lowest in 20-year citrus site, and was highest in 30-year citrus site. The results suggested that although the increase in the age of citrus favor to accumulation OC, the degree of immobilization of carbon and nitrogen and substrate available is highest before 20-year citrus.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"47 1","pages":"1694-1696"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79897450","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 : 2011-05-20DOI: 10.1109/ISWREP.2011.5893181
Jia Jia, W. Wenke, Duan Lei, Zheng Aiqin, Zheng Xiaoyan
Base flow is an important component element of water resources, which plays an important role in maintaining ecological base flow. Due to the difficulty in measurement, it is important to select an adaptive base flow separation method for further base flow research. Taking Weihe River Basin as the research object, based on the hydrological data of Huaxian County, this thesis adopts three different separation methods (PART, digital filter technique, and base flow index (BFI) separation method) to undertake a comparative study. The study shows that digital filter technique is the best one. And through analysis of Weihe River by this method, the base flow of Weihe River gradually reduces since 1930s.
{"title":"Comparative study of base flow separation methods-Taking Huaxian station of Weihe River for example","authors":"Jia Jia, W. Wenke, Duan Lei, Zheng Aiqin, Zheng Xiaoyan","doi":"10.1109/ISWREP.2011.5893181","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893181","url":null,"abstract":"Base flow is an important component element of water resources, which plays an important role in maintaining ecological base flow. Due to the difficulty in measurement, it is important to select an adaptive base flow separation method for further base flow research. Taking Weihe River Basin as the research object, based on the hydrological data of Huaxian County, this thesis adopts three different separation methods (PART, digital filter technique, and base flow index (BFI) separation method) to undertake a comparative study. The study shows that digital filter technique is the best one. And through analysis of Weihe River by this method, the base flow of Weihe River gradually reduces since 1930s.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"15 1","pages":"1000-1003"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81391645","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 : 2011-05-20DOI: 10.1109/ISWREP.2011.5893007
Li Ying, H. Guangcai, Yin Li-he, Wang Cunliang, Yang Feng, Zhang Jing, Huang Jin-ting, Dong Jiaqiu, L. Hua
The Subeinao Lake Basin, where the ecological environment is fragile and the vegetation depends tightly on groundwater, is located in the arid and semi-arid area. Based on the water content of the vadose zone measured in the plant-covered and clear area, we analyzed the distribution of root water uptake of typical vegetation in space and time. The following conclusions are obtained: (1) roots can ascend groundwater in the area where the depth to groundwater is shallow; (2) water contents in the vadose zone keeps a maximum around 13.4% between 10cm-110cm; The plant roots obtain enough moisture from the vadose zone or groundwater in order to guarantee required moisture during its growing. (3) Compared the water potential in covered and clear area, it can be concluded that the surface total head potential ranks as follows: the covered area>;Salix>;Salix psammophila. In conclusion, the vegetation coverage has effect on not only the total water content of surface, but also influence redistribution of water content in the vadose zone.
{"title":"Root water uptake of typical plants in the Subeinao Lake Basin","authors":"Li Ying, H. Guangcai, Yin Li-he, Wang Cunliang, Yang Feng, Zhang Jing, Huang Jin-ting, Dong Jiaqiu, L. Hua","doi":"10.1109/ISWREP.2011.5893007","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893007","url":null,"abstract":"The Subeinao Lake Basin, where the ecological environment is fragile and the vegetation depends tightly on groundwater, is located in the arid and semi-arid area. Based on the water content of the vadose zone measured in the plant-covered and clear area, we analyzed the distribution of root water uptake of typical vegetation in space and time. The following conclusions are obtained: (1) roots can ascend groundwater in the area where the depth to groundwater is shallow; (2) water contents in the vadose zone keeps a maximum around 13.4% between 10cm-110cm; The plant roots obtain enough moisture from the vadose zone or groundwater in order to guarantee required moisture during its growing. (3) Compared the water potential in covered and clear area, it can be concluded that the surface total head potential ranks as follows: the covered area>;Salix>;Salix psammophila. In conclusion, the vegetation coverage has effect on not only the total water content of surface, but also influence redistribution of water content in the vadose zone.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"3 1","pages":"311-314"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81681541","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 : 2011-05-20DOI: 10.1109/ISWREP.2011.5893418
T. Dai, Deming Xie
China is a country with many geothermal resources, there are rich geothermal resources which should be developed in many areas, although it has certain difficulty about exploration, development and utilization of deep geothermal resources, scientific development and rational utilization of deep geothermal resources has profound strategic significance. Systemic and further exploration and strategic thinking about important related problems of development of deep geotherm, the sustainable clean energy, are carried out. Furthermore, countermeasures and suggestions are presented in this paper: Based on scientifical planning, deep geothermal resources should be developed designedly and reasonably to keep deep geothermal resources protracted nature, stable and sustainable, moreover, management method of investment fund should be introduced to develope geothermal resource; Heat field distribution law and heat storge theory and other related field should be investigated deeply; It's necessary to establish a series of national united automated information management system and dynamic monitoring system of geothermal resource.
{"title":"Scientific development, rational utilization of deep geothermal resource —Strategic thought about development of sustainable clean energy","authors":"T. Dai, Deming Xie","doi":"10.1109/ISWREP.2011.5893418","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893418","url":null,"abstract":"China is a country with many geothermal resources, there are rich geothermal resources which should be developed in many areas, although it has certain difficulty about exploration, development and utilization of deep geothermal resources, scientific development and rational utilization of deep geothermal resources has profound strategic significance. Systemic and further exploration and strategic thinking about important related problems of development of deep geotherm, the sustainable clean energy, are carried out. Furthermore, countermeasures and suggestions are presented in this paper: Based on scientifical planning, deep geothermal resources should be developed designedly and reasonably to keep deep geothermal resources protracted nature, stable and sustainable, moreover, management method of investment fund should be introduced to develope geothermal resource; Heat field distribution law and heat storge theory and other related field should be investigated deeply; It's necessary to establish a series of national united automated information management system and dynamic monitoring system of geothermal resource.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"25 1","pages":"2631-2634"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82487490","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 : 2011-05-20DOI: 10.1109/ISWREP.2011.5893486
Xiaohong Zhao, Xiaohui Xu, Yongsheng Yan, Cuilan Yu, Shiping Hu
Combining solvent sublation with ionic liquid aqueous two-phase extraction (ILATPE), ionic liquid aqueous two-phase flotation (ILATPF) was proposed for preconcentration and separation of antibiotics in environment. The new technique was applied to preconcentrate and separate trace roxithromycin (ROX) in the environment using 1-butyl-3-methylimidazolium-tetrafluoroborate ([Bmim]BF4) ionic liquid as a green sublation solvent prior to molecular fluorescence spectrometry determination. Several factors affecting the extraction efficiency containing pH, conditions for phase separation, sublation time and gas flow rate were investigated and discussed in detail. The determination of ROX from practical samples offered satisfying extraction efficiency under the optimal conditions. The limit of detection (LOD) was 0.04 μg mL-1 and the relative standard deviation of 0.4 μg mL-1 ROX for 10 parallel determinations was lower than 0.77%. The concentration multiple of this method was 22.25 which was much larger than that of ILATPE.
{"title":"Preconcentration and separation of trace roxithromycin by [Bmim]BF4 - Na2CO3 Aqueous two-phase flotation system","authors":"Xiaohong Zhao, Xiaohui Xu, Yongsheng Yan, Cuilan Yu, Shiping Hu","doi":"10.1109/ISWREP.2011.5893486","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893486","url":null,"abstract":"Combining solvent sublation with ionic liquid aqueous two-phase extraction (ILATPE), ionic liquid aqueous two-phase flotation (ILATPF) was proposed for preconcentration and separation of antibiotics in environment. The new technique was applied to preconcentrate and separate trace roxithromycin (ROX) in the environment using 1-butyl-3-methylimidazolium-tetrafluoroborate ([Bmim]BF4) ionic liquid as a green sublation solvent prior to molecular fluorescence spectrometry determination. Several factors affecting the extraction efficiency containing pH, conditions for phase separation, sublation time and gas flow rate were investigated and discussed in detail. The determination of ROX from practical samples offered satisfying extraction efficiency under the optimal conditions. The limit of detection (LOD) was 0.04 μg mL-1 and the relative standard deviation of 0.4 μg mL-1 ROX for 10 parallel determinations was lower than 0.77%. The concentration multiple of this method was 22.25 which was much larger than that of ILATPE.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"24 1","pages":"2913-2916"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78670926","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 : 2011-05-20DOI: 10.1109/ISWREP.2011.5893643
Xujian Peng, Hai-qing Hu, Jia-bao Sun
Applying space sequence instead of temporal change, Rhododendron-Larix gmelinii forests's biomass distinctive responses at different successional stages after fire disturbance to varying degrees have been sysmatically studied at Daxing'an Mountains. The results show that: the ground biomass in the community increase progressively with recovery time after fire disturbance to varying degrees. At the early grass or shrub stage after high-intensity fire disturbance, the entire biomass are mainly comprised of biomasses from herb layer and shrub layer; suffering high-intensity fire disturbance after nineteen years or so, the most biomass mainly come from trees layer and the situation will last until the ultimate stage; when suffering middle-intensity fire disturbance, arbor layer, successional layer, shrub layer and total biomass in the forests will steadily increase with recovery time while herb layer decline by degrees. Almost all the biomasses mainly come from trees layer after ten years when fired; the low-intensity fire disturbance have less effect on the accumulation of all the layers, which illustrate that the proportion of biomass coming from respectively different layers remain almost unchanged in the whole biomass. Fire disturbance have varying effects on accumulation of biomass: As the recovery time advances, the ability of accumulating litter restore. This includes slowest restoring rate after high-intensity fire disturbance and fastest restoring rate after low-intensity fire disturbance. Meanwhile, the bare land after low-intensity fire disturbance provide a good opportunity for seed to contact with soil and accelerate the recovery of Rhododendron-Larix gmelinii forests; at different successional stages after fire disturbance, the wilted fell leaves have a larger proportion in all the litter. The proportion to which the conifers' fell leaves has the broads' could reflect characteristics at successional stages.
{"title":"Study on biomass dynamic change of Rhododendron-Larix gmelinii forests after fire disturbance","authors":"Xujian Peng, Hai-qing Hu, Jia-bao Sun","doi":"10.1109/ISWREP.2011.5893643","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893643","url":null,"abstract":"Applying space sequence instead of temporal change, Rhododendron-Larix gmelinii forests's biomass distinctive responses at different successional stages after fire disturbance to varying degrees have been sysmatically studied at Daxing'an Mountains. The results show that: the ground biomass in the community increase progressively with recovery time after fire disturbance to varying degrees. At the early grass or shrub stage after high-intensity fire disturbance, the entire biomass are mainly comprised of biomasses from herb layer and shrub layer; suffering high-intensity fire disturbance after nineteen years or so, the most biomass mainly come from trees layer and the situation will last until the ultimate stage; when suffering middle-intensity fire disturbance, arbor layer, successional layer, shrub layer and total biomass in the forests will steadily increase with recovery time while herb layer decline by degrees. Almost all the biomasses mainly come from trees layer after ten years when fired; the low-intensity fire disturbance have less effect on the accumulation of all the layers, which illustrate that the proportion of biomass coming from respectively different layers remain almost unchanged in the whole biomass. Fire disturbance have varying effects on accumulation of biomass: As the recovery time advances, the ability of accumulating litter restore. This includes slowest restoring rate after high-intensity fire disturbance and fastest restoring rate after low-intensity fire disturbance. Meanwhile, the bare land after low-intensity fire disturbance provide a good opportunity for seed to contact with soil and accelerate the recovery of Rhododendron-Larix gmelinii forests; at different successional stages after fire disturbance, the wilted fell leaves have a larger proportion in all the litter. The proportion to which the conifers' fell leaves has the broads' could reflect characteristics at successional stages.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"42 1","pages":"1966-1971"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78907025","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}
Red soil in southern hill region is an adsorbent with the characteristics of economy, accessibility and so on. The phosphorus adsorption characteristics of red soil were studied in this paper. Differences in parameters of phosphorus absorption at different concentrations with different weights of red soil were compared, and the influence of temperature and pH on the phosphorus adsorption was discussed. The results indicate that the isothermal adsorption data fit better with the Langmuir models than the Freundlich models. The saturated adsorption capacity of phosphorus can reach 0.454 mg/g when the temperature is 30°C, indicating that the red soil is a good adsorbent material for removing phosphorus, and can be well used as a medium in constructed wetland. The phosphorus adsorption quantity of red soil increases rapidly with time in the initial period and then approaches to a constant level in the later period. In the high concentration of initial phosphorus, the temperature on phosphorus adsorption of red soil is becoming apparent with the concentration increased. The tests show that the influence of pH at 6 to 9 on phosphorus adsorption is not significant. Hence, the influence of pH on phosphorus adsorption of red soil can be ignored in constructed wetland.
{"title":"Phosphorus adsorption characteristics of red soil in hilly region of South China","authors":"Liwei Yang, Tinglin Huang, Haiyan Wang, Fengtao Wan, Yuexi Zhou","doi":"10.1109/ISWREP.2011.5893623","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893623","url":null,"abstract":"Red soil in southern hill region is an adsorbent with the characteristics of economy, accessibility and so on. The phosphorus adsorption characteristics of red soil were studied in this paper. Differences in parameters of phosphorus absorption at different concentrations with different weights of red soil were compared, and the influence of temperature and pH on the phosphorus adsorption was discussed. The results indicate that the isothermal adsorption data fit better with the Langmuir models than the Freundlich models. The saturated adsorption capacity of phosphorus can reach 0.454 mg/g when the temperature is 30°C, indicating that the red soil is a good adsorbent material for removing phosphorus, and can be well used as a medium in constructed wetland. The phosphorus adsorption quantity of red soil increases rapidly with time in the initial period and then approaches to a constant level in the later period. In the high concentration of initial phosphorus, the temperature on phosphorus adsorption of red soil is becoming apparent with the concentration increased. The tests show that the influence of pH at 6 to 9 on phosphorus adsorption is not significant. Hence, the influence of pH on phosphorus adsorption of red soil can be ignored in constructed wetland.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"15 1","pages":"1888-1890"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76334500","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 : 2011-05-20DOI: 10.1109/ISWREP.2011.5893709
Qinglong Meng, Yanling Guan, Yaxiu Gu, Yuan Wang
To simulate the microclimate environment of atmospheric surface layer (ASL), an environment simulation laboratory was constructed. The layout, functions and performance of the lab are discussed in detail, and the equipment and instruments of the lab are introduced. The key techniques of ASL environmental test are analyzed. This paper presents some results of environmental simulation for some climate parameters, such as air temperature, wind speed and solar irradiance. The physical test results shows that the controlled-environment chamber herein described could provide a valuable novel experimental platform for investigating various applications, such as solar cell test, light and heat utilization, in ASL.
{"title":"Laboratory simulation for microclimate environment of atmospheric surface layer","authors":"Qinglong Meng, Yanling Guan, Yaxiu Gu, Yuan Wang","doi":"10.1109/ISWREP.2011.5893709","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893709","url":null,"abstract":"To simulate the microclimate environment of atmospheric surface layer (ASL), an environment simulation laboratory was constructed. The layout, functions and performance of the lab are discussed in detail, and the equipment and instruments of the lab are introduced. The key techniques of ASL environmental test are analyzed. This paper presents some results of environmental simulation for some climate parameters, such as air temperature, wind speed and solar irradiance. The physical test results shows that the controlled-environment chamber herein described could provide a valuable novel experimental platform for investigating various applications, such as solar cell test, light and heat utilization, in ASL.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"7 1","pages":"2232-2235"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87506405","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 : 2011-05-20DOI: 10.1109/ISWREP.2011.5893026
Xunhong Chen
Determination of hyporheic zone thickness in streams is an important step for study of stream-aquifer interactions. Knowledge about hyporheic zone thickness is useful in stream restoration. However, because there is a lack of standard techniques for such study, evaluation of the hyporheic zone thickness for a given stream reach remains a challenge task for researchers. This paper presents Galerkin finite element flow and stream function models that can simulate the hyporheic zone thickness. The flow and stream function equations are solved for 2-D profile domains that can be across a stream or parallel to a stream. The numeral schemes for solving the flow and stream function equations and the treatment of boundary conditions are described. Hypothetical streams are used for simulation of the control of hyporheic zone thickness by the magnitude of inflow and outflow that occur at the stream-sediment interface. Groundwater flow velocity field is generated to examine the flow dynamics in hyporheic zones. The magnitude of groundwater flow velocity in hyporheic zone is greater than that of regional groundwater flow.
{"title":"Fluctuation of hyporheic zone thickness due to inflow and outflow across the water-sediment interface","authors":"Xunhong Chen","doi":"10.1109/ISWREP.2011.5893026","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893026","url":null,"abstract":"Determination of hyporheic zone thickness in streams is an important step for study of stream-aquifer interactions. Knowledge about hyporheic zone thickness is useful in stream restoration. However, because there is a lack of standard techniques for such study, evaluation of the hyporheic zone thickness for a given stream reach remains a challenge task for researchers. This paper presents Galerkin finite element flow and stream function models that can simulate the hyporheic zone thickness. The flow and stream function equations are solved for 2-D profile domains that can be across a stream or parallel to a stream. The numeral schemes for solving the flow and stream function equations and the treatment of boundary conditions are described. Hypothetical streams are used for simulation of the control of hyporheic zone thickness by the magnitude of inflow and outflow that occur at the stream-sediment interface. Groundwater flow velocity field is generated to examine the flow dynamics in hyporheic zones. The magnitude of groundwater flow velocity in hyporheic zone is greater than that of regional groundwater flow.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"69 1 1","pages":"388-391"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87657221","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 : 2011-05-20DOI: 10.1109/ISWREP.2011.5893456
Yongyong Li, Lin Zhu, Lijuan Zhao, Jun Jiang
Improving the convergence speed and global searching ability of Back Propagation network (BP) always occupies a significant and sophisticated subject. This paper improves the intelligent model by coupling the Genetic Algorithm (GA). Specific improvements include initializing multiple sets of BP's weights and thresholds, setting a smaller BP training epoch and building the fitness function by inputting verification data for BP. The process of building the BP-GA model is explained in detail. Take the water quality assessment in Baiyangdian wetland as an example. The output of this model is compared with the one by using the fuzzy synthetic evaluation method. Result shows that the trained BP-GA model can be effectively used to assess the water quality.
{"title":"Study on the BP-GA model and its application in water quality assessment","authors":"Yongyong Li, Lin Zhu, Lijuan Zhao, Jun Jiang","doi":"10.1109/ISWREP.2011.5893456","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893456","url":null,"abstract":"Improving the convergence speed and global searching ability of Back Propagation network (BP) always occupies a significant and sophisticated subject. This paper improves the intelligent model by coupling the Genetic Algorithm (GA). Specific improvements include initializing multiple sets of BP's weights and thresholds, setting a smaller BP training epoch and building the fitness function by inputting verification data for BP. The process of building the BP-GA model is explained in detail. Take the water quality assessment in Baiyangdian wetland as an example. The output of this model is compared with the one by using the fuzzy synthetic evaluation method. Result shows that the trained BP-GA model can be effectively used to assess the water quality.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"4 1","pages":"2781-2784"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87518055","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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