Pub Date : 2011-05-20DOI: 10.1109/ISWREP.2011.5893203
Yinke Yang, Wenke Wang, Donghui Cheng, Hongbin Yang
Reservoir impoundment can have significant impact on natural flow regime of rivers. This paper takes Quwa reach of Bailong River located in Zhouqu County, Gansu Province as the study area. Analysis is done on changes happened to the flow regime of Bailong River from the dam to Lingba Village in Quwa Township, after the Daronglijie hydropower plant was built in Zhouqu County. The result indicates that the natural velocity of flow in this reach is above 2.0 m/s, but it decreased to 0.5 m/s after the dam was built. The velocity of flow declined, river level went up and sediment transport capacity of river dropped significantly, which is a major cause of serious river channel sedimentation.
{"title":"Reservoir impoundment influence on river flow regime","authors":"Yinke Yang, Wenke Wang, Donghui Cheng, Hongbin Yang","doi":"10.1109/ISWREP.2011.5893203","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893203","url":null,"abstract":"Reservoir impoundment can have significant impact on natural flow regime of rivers. This paper takes Quwa reach of Bailong River located in Zhouqu County, Gansu Province as the study area. Analysis is done on changes happened to the flow regime of Bailong River from the dam to Lingba Village in Quwa Township, after the Daronglijie hydropower plant was built in Zhouqu County. The result indicates that the natural velocity of flow in this reach is above 2.0 m/s, but it decreased to 0.5 m/s after the dam was built. The velocity of flow declined, river level went up and sediment transport capacity of river dropped significantly, which is a major cause of serious river channel sedimentation.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"18 1","pages":"1087-1089"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83291648","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.2011.5893725
Jiang Chao, Guan Yanling
Based on the principle of superposition, the Infinite - length Linear Heat-source Model is applied to the analysis of the long-term performance of Ground Heat Exchanger for Ground Source Heat Pump. It is shown that the inlet and outlet temperatures of the Ground Heat Exchanger vary with the start time of the operation even if under the same annual dynamic load. The result suggests that the load distribution affects the performance of GSHP even if just the time sequences varying. Therefore the start time of the operation must be considered in the feasibility analysis of a GSHP system.
{"title":"The research on the influence of the start time of the operation on the performance of the Ground Heat Exchanger","authors":"Jiang Chao, Guan Yanling","doi":"10.1109/ISWREP.2011.5893725","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893725","url":null,"abstract":"Based on the principle of superposition, the Infinite - length Linear Heat-source Model is applied to the analysis of the long-term performance of Ground Heat Exchanger for Ground Source Heat Pump. It is shown that the inlet and outlet temperatures of the Ground Heat Exchanger vary with the start time of the operation even if under the same annual dynamic load. The result suggests that the load distribution affects the performance of GSHP even if just the time sequences varying. Therefore the start time of the operation must be considered in the feasibility analysis of a GSHP system.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"28 1","pages":"2296-2299"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83419130","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.2011.5893023
Yexin Gao, Lifang Wang, Yazhe Zhang
In view of the good open level of the shallow aquifer, the groundwater is apt to be contaminated and its exploitation potential is easy to be affected. The paper takes the shallow aquifer in the northern suburbs of Zhengzhou as example. According to TDS values observed from 1999 to 2004 and the results of water balance, TDS's variation and groundwater exploitation potential in the shallow aquifer are respectively analyzed. The main conclusions are as follows: (1) The geochemistry environment of the shallow aquifer in the monitor area (phreatic water-feeble confined water upside) has evolution tendency to worse; (2) The maximum exploitation potential is 160,000 m3/d.
{"title":"Potential analysis on the shallow aquifer in groundwater source field in the northern suburbs of Zhengzhou city","authors":"Yexin Gao, Lifang Wang, Yazhe Zhang","doi":"10.1109/ISWREP.2011.5893023","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893023","url":null,"abstract":"In view of the good open level of the shallow aquifer, the groundwater is apt to be contaminated and its exploitation potential is easy to be affected. The paper takes the shallow aquifer in the northern suburbs of Zhengzhou as example. According to TDS values observed from 1999 to 2004 and the results of water balance, TDS's variation and groundwater exploitation potential in the shallow aquifer are respectively analyzed. The main conclusions are as follows: (1) The geochemistry environment of the shallow aquifer in the monitor area (phreatic water-feeble confined water upside) has evolution tendency to worse; (2) The maximum exploitation potential is 160,000 m3/d.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"29 1","pages":"378-380"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83471893","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.2011.5893111
Jiang Jin, Sun Wei
Water resource has become a bottleneck in Guanzhong region of Shaanxi province. Therefore, combined with the practical program, the dissertation sets up a optimization model on the water resources allocation in the Shaanxi's South-to-North water transfer Project, and the resolving method for this optimal model is solved based on Genetic Algorithms (GA), at last the unit water resources optimization allocation system is establish. After contrast the water resources allocation result of the optimal model to the conventional one, showed that this system can increase 98.75 million cubic meters, which can provide an evidence for more reasonable allocation management.
{"title":"Unit water resources allocation in Shaanxi's South-to-North water transfer Project","authors":"Jiang Jin, Sun Wei","doi":"10.1109/ISWREP.2011.5893111","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893111","url":null,"abstract":"Water resource has become a bottleneck in Guanzhong region of Shaanxi province. Therefore, combined with the practical program, the dissertation sets up a optimization model on the water resources allocation in the Shaanxi's South-to-North water transfer Project, and the resolving method for this optimal model is solved based on Genetic Algorithms (GA), at last the unit water resources optimization allocation system is establish. After contrast the water resources allocation result of the optimal model to the conventional one, showed that this system can increase 98.75 million cubic meters, which can provide an evidence for more reasonable allocation management.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"34 1","pages":"730-732"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83386612","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.2011.5893547
Zhao Xiaoguang, Chen Lingling, Bi Jisong, Y. Shasha
In this paper, the organic-inorganic complex prepared by degradation of liquid manure and bentonite was used as adsorbent. And NaNO3 was used as nitrogen salt, KCL as potassium salt, and CuSO4 · 5H2O provided Cu2+. Different concentrations of nitrogen and potassium salt were prepared to carry adsorption reaction with certain concentration of Cu2+ in aqueous solution. Through these experiments, study that whether a competitive adsorption occurs between nitrogen, potassium nutrients and Cu2+ or not, as well as the variation of adsorption rate of Cu2+ in different concentrations of nitrogen and potassium nutrients. The study results show that: (1) NO3- affects the adsorption rate of Cu2+. As the concentration of NO3- increases, the adsorption rate of Cu2+ decreases. When the concentration of NO3- is larger than a certain value, the adsorption rate of Cu2+ will increase gradually. (2) There is competitive adsorption between K+ and Cu2+, with the increase of concentration of K+, the adsorption rate of Cu2+ decreases gradually.
{"title":"Competitive adsorption of N, P and Cu in aqueous solution on organic-inorganic complex","authors":"Zhao Xiaoguang, Chen Lingling, Bi Jisong, Y. Shasha","doi":"10.1109/ISWREP.2011.5893547","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893547","url":null,"abstract":"In this paper, the organic-inorganic complex prepared by degradation of liquid manure and bentonite was used as adsorbent. And NaNO<sub>3</sub> was used as nitrogen salt, KCL as potassium salt, and CuSO<sub>4</sub> · 5H<sub>2</sub>O provided Cu<sup>2+</sup>. Different concentrations of nitrogen and potassium salt were prepared to carry adsorption reaction with certain concentration of Cu<sup>2+</sup> in aqueous solution. Through these experiments, study that whether a competitive adsorption occurs between nitrogen, potassium nutrients and Cu<sup>2+</sup> or not, as well as the variation of adsorption rate of Cu<sup>2+</sup> in different concentrations of nitrogen and potassium nutrients. The study results show that: (1) NO<sub>3</sub><sup>-</sup> affects the adsorption rate of Cu<sup>2+</sup>. As the concentration of NO<sub>3</sub><sup>-</sup> increases, the adsorption rate of Cu<sup>2+</sup> decreases. When the concentration of NO<sub>3</sub><sup>-</sup> is larger than a certain value, the adsorption rate of Cu<sup>2+</sup> will increase gradually. (2) There is competitive adsorption between K<sup>+</sup> and Cu<sup>2+</sup>, with the increase of concentration of K<sup>+</sup>, the adsorption rate of Cu<sup>2+</sup> decreases gradually.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"8 1","pages":"3150-3152"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84732693","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.2011.5893139
Gu Jie, Chen Wei, Qin Xin, Ma Danqing, Huang Hanlu
A 3D numerical model is set up to simulate the tidal current and sediment transport in the Changjiang River estuary with ECOMSED model, which has been validated with the measured data, the computed results of water level, flow velocity magnitude and direction, and suspended sediment concentration agree well with the measured data. This paper analyzes the influence of Hengsha Passage on sediment deposition in the upper reach of the Deepwater Navigation Channel in the Changjiang River Estuary by use of this model, in order to explore the reason for the sediment deposition in the upper reach of the Deepwater Navigation Channel.
{"title":"Numerical analysis of the influence of Hengsha passage on sediment deposition in the upper reach of the Deepwater Navigation Channel in the Changjiang River estuary","authors":"Gu Jie, Chen Wei, Qin Xin, Ma Danqing, Huang Hanlu","doi":"10.1109/ISWREP.2011.5893139","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893139","url":null,"abstract":"A 3D numerical model is set up to simulate the tidal current and sediment transport in the Changjiang River estuary with ECOMSED model, which has been validated with the measured data, the computed results of water level, flow velocity magnitude and direction, and suspended sediment concentration agree well with the measured data. This paper analyzes the influence of Hengsha Passage on sediment deposition in the upper reach of the Deepwater Navigation Channel in the Changjiang River Estuary by use of this model, in order to explore the reason for the sediment deposition in the upper reach of the Deepwater Navigation Channel.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"14 1","pages":"823-829"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84813416","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.2011.5893048
Yuan Hong-lin, Cheng Hai-qing
Through the analysis of different underlying surfaces during rainfall in Xi'an stormwater runoff water quality. This paper studies the sources of pollutants in stormwater and water quality variations. The results showed that: The major pollutants in the rainfall are SS, COD, NH3-N, TP. SS, COD and TP are mainly from rainfall runoff process by the underlying surface erosion, NH3-N is mainly from the leach of atmosphere caused by rainfall. Concentration of each pollutant in runoff exceeds V water requirements of GB3838-2002 in “Surface Water Environmental Quality Standard”. The concentration of pollutants shows overall downward trend in rainfall process, tending to be stable eventually. SS, and COD, TP, NH3-N has a strong correlation. All kinds of pollutants are mostly attached to the particles. To remove the SS is the key to control of the stormwater runoff pollution and stormwater treatment. The values of BOD/COD for rainwater were less than 0.3. Biochemical process performance is poor and it's fitted to uses physicochemical treatment.
{"title":"Analysis of water quality variation of rainfall in Xi'an","authors":"Yuan Hong-lin, Cheng Hai-qing","doi":"10.1109/ISWREP.2011.5893048","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893048","url":null,"abstract":"Through the analysis of different underlying surfaces during rainfall in Xi'an stormwater runoff water quality. This paper studies the sources of pollutants in stormwater and water quality variations. The results showed that: The major pollutants in the rainfall are SS, COD, NH3-N, TP. SS, COD and TP are mainly from rainfall runoff process by the underlying surface erosion, NH3-N is mainly from the leach of atmosphere caused by rainfall. Concentration of each pollutant in runoff exceeds V water requirements of GB3838-2002 in “Surface Water Environmental Quality Standard”. The concentration of pollutants shows overall downward trend in rainfall process, tending to be stable eventually. SS, and COD, TP, NH3-N has a strong correlation. All kinds of pollutants are mostly attached to the particles. To remove the SS is the key to control of the stormwater runoff pollution and stormwater treatment. The values of BOD/COD for rainwater were less than 0.3. Biochemical process performance is poor and it's fitted to uses physicochemical treatment.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"82 1","pages":"482-485"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86668793","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.2011.5893352
Qiang-kun Li, Juan Sun, Ya-wei Hu
Loads quantitative research is the basic of control, evaluation and management of agricultural non-point source pollution (AGNSP). Based on the AGNSP characteristic, the AGNSP model was divided into “Sources” module and “Sinks” module. Thereinto, “Sources” Module is further divided into farmland irrigation drainage sub-module and contaminants concentrations in farmland drainage estimating sub-module, in which, irrigation drainage was calculated by DRAINMOD model based on the principle of water balance on farmland. Meanwhile, the synthesis of fertilization and irrigation is used as an impulse input to the farmland, the pollutant concentration change in agricultural drainage is looked as the response process corresponding to the impulse input, the complex migration and transformation process of pollutant in soil is expressed impliedly by Inverse Gaussian Probability Density Function. The one-dimensional transport model of AGNSP pollutants in drainage ditch system was constructed on the basis of the equation of continuity of flow and pollutants migration and transformation. Integrating two modules, the complete AGNSP load model was constructed.
{"title":"Preliminary establishment of agricultural non-point source pollution model","authors":"Qiang-kun Li, Juan Sun, Ya-wei Hu","doi":"10.1109/ISWREP.2011.5893352","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893352","url":null,"abstract":"Loads quantitative research is the basic of control, evaluation and management of agricultural non-point source pollution (AGNSP). Based on the AGNSP characteristic, the AGNSP model was divided into “Sources” module and “Sinks” module. Thereinto, “Sources” Module is further divided into farmland irrigation drainage sub-module and contaminants concentrations in farmland drainage estimating sub-module, in which, irrigation drainage was calculated by DRAINMOD model based on the principle of water balance on farmland. Meanwhile, the synthesis of fertilization and irrigation is used as an impulse input to the farmland, the pollutant concentration change in agricultural drainage is looked as the response process corresponding to the impulse input, the complex migration and transformation process of pollutant in soil is expressed impliedly by Inverse Gaussian Probability Density Function. The one-dimensional transport model of AGNSP pollutants in drainage ditch system was constructed on the basis of the equation of continuity of flow and pollutants migration and transformation. Integrating two modules, the complete AGNSP load model was constructed.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"2 1","pages":"1636-1639"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79577579","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.2011.5893608
Jing Ren, Yu-kuan Wang, Bin Fu, Pei Xu
Studying and revealing the spatial distribution of soil loss will play an important role in water and soil conservation planning. In this study, the Geographic Information System (GIS) technology and the Integrated Valuation of Ecosystem Services and Tradeoffs Tool (InVEST) model were applied to estimate the amount of soil loss and assess the soil conservation capacity by the main ecological system in the Upper Yangtze River Basin (UYRB). The results show: (1) the annual potential soil erosion is 92.92×108 t year-1. The area of average annual soil loss bellow 500 km-2 year-1 occupies 35.08% and above 5000 km-2 year-1 occupies 36.8%. (2)The annual actual soil erosion is 12.30×108 t year-1. Slight and moderate soil loss is in majority, about 68.15% of the watershed area is found out to be under moderate degree. (3)The annual soil conservation is 80.61×108 t year-1, and the contributing percent of main individual ecosystems was as follows: the forest occupies 46.11%, grassland 24.21%. Forest ecosystem does best in soil conservation.
研究和揭示水土流失的空间分布规律对水土保持规划具有重要意义。本文采用地理信息系统(GIS)技术和生态系统服务与权衡综合评估工具(InVEST)模型，对长江上游主要生态系统的土壤流失量进行估算，并对其土壤保持能力进行评价。结果表明:(1)年土壤侵蚀潜力为92.92×108。年平均水土流失量在500 km-2以下的面积占35.08%，在5000 km-2以上的面积占36.8%。(2)年实际土壤侵蚀量为12.30×108 t -1。水土流失以轻度和中度为主，约占流域面积的68.15%。(3)年土壤保持力为80.61×108 t -1，主要生态系统个体贡献率为:森林占46.11%，草地占24.21%。森林生态系统的水土保持效果最好。
{"title":"Soil conservation assessment in the Upper Yangtze River Basin based on invest model","authors":"Jing Ren, Yu-kuan Wang, Bin Fu, Pei Xu","doi":"10.1109/ISWREP.2011.5893608","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893608","url":null,"abstract":"Studying and revealing the spatial distribution of soil loss will play an important role in water and soil conservation planning. In this study, the Geographic Information System (GIS) technology and the Integrated Valuation of Ecosystem Services and Tradeoffs Tool (InVEST) model were applied to estimate the amount of soil loss and assess the soil conservation capacity by the main ecological system in the Upper Yangtze River Basin (UYRB). The results show: (1) the annual potential soil erosion is 92.92×10<sup>8</sup> t year<sup>-1</sup>. The area of average annual soil loss bellow 500 km<sup>-2</sup> year<sup>-1</sup> occupies 35.08% and above 5000 km<sup>-2</sup> year<sup>-1</sup> occupies 36.8%. (2)The annual actual soil erosion is 12.30×10<sup>8</sup> t year<sup>-1</sup>. Slight and moderate soil loss is in majority, about 68.15% of the watershed area is found out to be under moderate degree. (3)The annual soil conservation is 80.61×10<sup>8</sup> t year<sup>-1</sup>, and the contributing percent of main individual ecosystems was as follows: the forest occupies 46.11%, grassland 24.21%. Forest ecosystem does best in soil conservation.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"188 1","pages":"1833-1836"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77326525","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.2011.5893419
S. Song, Yan Kang
Pair-copula is a new method for higher dimensional copulas construction. Based on the principle of pair-copula decomposition, An example of applying the copula to multivariate hydrological drought frequency was given. Monthly average flow data from Zhuang tou gauging station in Weihe Basin, China, was used to illustrate these methods. Chi-square test, Kolmogorov-Smirnov test, Cramer-von Mises statistic, Anderson-Darling statistic, modified weighted Watson statistic, and Liao and Shimokawa statistic were employed to test goodness-of-fit for these univariate distribution. Pearson's classical correlation coefficient rn, Spearman's ρn, Kendall's τ, Chi-Plots, and K-Plots were used to assess the dependence of drought variables. According to three different permuting ways of drought variables, twelve copulas were used to model the joint probability distributions. A three dimensional probability distribution formula was derived. Based on the Root Mean Square Error (RMSE), the Akaike Information Criterion (AIC) and Bayesian Information Criterial (BIC), the best fitting copula was selected. A bootstrap version based on Rosenblatt's transformation was employed to test the goodness-of-fit of the copula. Comparing with 12 copulas, the Frank copula under D-V-P structure has the best fitting for joint probability distribution of hydrological drought distribution. The results indicated pair-copula decomposition is a feasible way to model multivariate frequency analysis.
对联结是构造高维联结的一种新方法。基于对copula分解原理，给出了copula在多元水文干旱频率分析中的应用实例。以渭河流域庄头测量站的月平均流量数据为例进行了分析。采用卡方检验、Kolmogorov-Smirnov检验、Cramer-von Mises统计、Anderson-Darling统计、修正加权Watson统计和Liao and Shimokawa统计对这些单变量分布进行拟合优度检验。使用Pearson经典相关系数rn、Spearman ρn、Kendall τ、Chi-Plots和K-Plots来评估干旱变量的相关性。根据干旱变量的三种不同排列方式，采用12个联结模型对联合概率分布进行建模。导出了三维概率分布公式。基于均方根误差(RMSE)、赤池信息准则(AIC)和贝叶斯信息准则(BIC)，选择最佳拟合组合。采用基于Rosenblatt变换的自举方法来检验联结公式的拟合优度。与12种copula相比，D-V-P结构下的Frank copula最适合水文干旱分布的联合概率分布。结果表明，对耦合分解是一种可行的多变量频率分析建模方法。
{"title":"Pair-copula decomposition constructions for multivariate hydrological drought frequency analysis","authors":"S. Song, Yan Kang","doi":"10.1109/ISWREP.2011.5893419","DOIUrl":"https://doi.org/10.1109/ISWREP.2011.5893419","url":null,"abstract":"Pair-copula is a new method for higher dimensional copulas construction. Based on the principle of pair-copula decomposition, An example of applying the copula to multivariate hydrological drought frequency was given. Monthly average flow data from Zhuang tou gauging station in Weihe Basin, China, was used to illustrate these methods. Chi-square test, Kolmogorov-Smirnov test, Cramer-von Mises statistic, Anderson-Darling statistic, modified weighted Watson statistic, and Liao and Shimokawa statistic were employed to test goodness-of-fit for these univariate distribution. Pearson's classical correlation coefficient rn, Spearman's ρn, Kendall's τ, Chi-Plots, and K-Plots were used to assess the dependence of drought variables. According to three different permuting ways of drought variables, twelve copulas were used to model the joint probability distributions. A three dimensional probability distribution formula was derived. Based on the Root Mean Square Error (RMSE), the Akaike Information Criterion (AIC) and Bayesian Information Criterial (BIC), the best fitting copula was selected. A bootstrap version based on Rosenblatt's transformation was employed to test the goodness-of-fit of the copula. Comparing with 12 copulas, the Frank copula under D-V-P structure has the best fitting for joint probability distribution of hydrological drought distribution. The results indicated pair-copula decomposition is a feasible way to model multivariate frequency analysis.","PeriodicalId":6425,"journal":{"name":"2011 International Symposium on Water Resource and Environmental Protection","volume":"67 1","pages":"2635-2638"},"PeriodicalIF":0.0,"publicationDate":"2011-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90733808","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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