岩溶区流域月、季尺度降雨变化特征及其与台风相关性分析

研究采用相对变化率、集中度和集中期分析降雨的年内分布规律,然后采用线性趋势和Mann-Kendall等研究降雨的年际变化规律,最后采用Pearson相关分析和灰色相关分析方法探讨降雨与台风的相关性特征。结果显示,各月降雨相对变化率达到30%以上,降雨趋于集中化,主要集中在7月份;月平均降雨量相对稳定,春、夏季降雨减少,而秋、冬季降雨呈增加趋势;降雨的突变发生在20世纪80~90年代。在台风各影响因子中,台风降雨是影响夏秋降雨的主要因素,而台风发生次数对降雨量影响最小。

Multi-attributed decision making for mining methods based on grey system and interval numbers

In the case of unknown weights, theories of multi-attributed decision making based on interval numbers and grey related analysis were used to optimize mining methods. As the representative of independence for the indicator, the smaller the correlation of indicators is, the greater the weight is. Hence, the weights of interval numbers of indicators were determined by using correlation coefficient. Relative closeness based on positive and negative ideal methods was calculated by introducing distance between interval numbers, which made decision making more rational and comprehensive. A new method of ranking interval numbers based on normal distribution was proposed for the optimization of mining methods, whose basic properties were discussed. Finally, the feasibility and effectiveness of this method were verified by theories and practice.