The Yongding New River is essential for the water supplies of Tianjin.To date,there is no comprehensive report that assesses the year-round water quality of the Yongding New River Main stream.Moreover,little attention...The Yongding New River is essential for the water supplies of Tianjin.To date,there is no comprehensive report that assesses the year-round water quality of the Yongding New River Main stream.Moreover,little attention has been given to determining a combined weight for improving the traditional comprehensive water quality identification index(ICWQII)by the game theory.Seven water quality parameters were investigated monthly along the main stream of the Yongding New River from May 2018 to April 2019.Organic contaminants and nitrogen pollution were mainly caused by point sources pollution,and the total phosphorus mainly by non-point source pollution.Dramatic spatio-temporal variations of water quality parameters were jointly caused by different pollutant sources and hydrometeorological factors.In terms of this study,an improved comprehensive water quality identification index(ICWQII)based on entropy weight or variation coefficient and traditional CWQII underestimated the water qualities,and an ICWQII based on the superstandard multiple method overvalued the assessments.By contrast,water qualities assessments done with an ICWQII based on the game theory matched perfectly with the practical situation.The ICWQII based on game theory proposed in this study takes into account not only the degree of disorder and variation of water quality data,but also the influence of standard-exceeded pollution indicators,whose results are relatively reasonable.All findings and the ICWQII based on game theory can provide scientific support for decisions related to the water environment management of the Yongding New River and other waters.展开更多
冲击地压作为煤矿生产过程中常见的动力灾害,给煤矿安全生产带来极大威胁,因此,工作面回采前进行冲击危险性评价尤为重要。为构建冲击地压危险性的科学评价模型,本文收集和研究了140个煤矿工作面实例,分析了冲击地压的影响因素,从每个...冲击地压作为煤矿生产过程中常见的动力灾害,给煤矿安全生产带来极大威胁,因此,工作面回采前进行冲击危险性评价尤为重要。为构建冲击地压危险性的科学评价模型,本文收集和研究了140个煤矿工作面实例,分析了冲击地压的影响因素,从每个案例中提取14项评价指标,并建立了数据库。基于数量化理论评价法与模糊评价法,建立了适用性更强的TWF(theory of quantification with fuzzy evaluation)评价法,该方法继承了数量化理论和模糊评价法的优势,并将煤矿冲击危险程度划分为5个等级。以河南某煤矿工作面为背景,采用TWF冲击危险性评价模型对该工作面进行了冲击危险性评价,得出危险性指数为19.83,评价结果为无冲击危险性,与现场实际相符,表明该评价模型具有较强的适用性;开发了TWF综合评价系统,持续的案例补充可不断提高TWF评价模型的评价精度,研究成果可为冲击地压危险评价提供一定的理论参考。展开更多
基金supported by the National Natural Science Foundation of China(No.41807386)Tianjin Financial Budget Project of 2018。
文摘The Yongding New River is essential for the water supplies of Tianjin.To date,there is no comprehensive report that assesses the year-round water quality of the Yongding New River Main stream.Moreover,little attention has been given to determining a combined weight for improving the traditional comprehensive water quality identification index(ICWQII)by the game theory.Seven water quality parameters were investigated monthly along the main stream of the Yongding New River from May 2018 to April 2019.Organic contaminants and nitrogen pollution were mainly caused by point sources pollution,and the total phosphorus mainly by non-point source pollution.Dramatic spatio-temporal variations of water quality parameters were jointly caused by different pollutant sources and hydrometeorological factors.In terms of this study,an improved comprehensive water quality identification index(ICWQII)based on entropy weight or variation coefficient and traditional CWQII underestimated the water qualities,and an ICWQII based on the superstandard multiple method overvalued the assessments.By contrast,water qualities assessments done with an ICWQII based on the game theory matched perfectly with the practical situation.The ICWQII based on game theory proposed in this study takes into account not only the degree of disorder and variation of water quality data,but also the influence of standard-exceeded pollution indicators,whose results are relatively reasonable.All findings and the ICWQII based on game theory can provide scientific support for decisions related to the water environment management of the Yongding New River and other waters.
文摘冲击地压作为煤矿生产过程中常见的动力灾害,给煤矿安全生产带来极大威胁,因此,工作面回采前进行冲击危险性评价尤为重要。为构建冲击地压危险性的科学评价模型,本文收集和研究了140个煤矿工作面实例,分析了冲击地压的影响因素,从每个案例中提取14项评价指标,并建立了数据库。基于数量化理论评价法与模糊评价法,建立了适用性更强的TWF(theory of quantification with fuzzy evaluation)评价法,该方法继承了数量化理论和模糊评价法的优势,并将煤矿冲击危险程度划分为5个等级。以河南某煤矿工作面为背景,采用TWF冲击危险性评价模型对该工作面进行了冲击危险性评价,得出危险性指数为19.83,评价结果为无冲击危险性,与现场实际相符,表明该评价模型具有较强的适用性;开发了TWF综合评价系统,持续的案例补充可不断提高TWF评价模型的评价精度,研究成果可为冲击地压危险评价提供一定的理论参考。
