知识与财富的链接
基于1960-2020 年蒙江流域日降水资料、蒙江控制站太平站径流和输沙资料分析蒙江流域降水量、径流量和输沙量的演变特征及原因;运用线性趋势回归检验法分析其趋势成分;采用Mann-Whitney-Pettitt 突变点分析法对其进行突变分析;采用Morlet 小波分析法分析其周期成分。结果表明：除夏季降水量、径流量、输沙量和冬季降水量呈不明显的减少趋势外,其余序列呈不明显的增加趋势;年降水量、年径流量和年输沙量呈不明显的增加趋势,没有发生显著突变;年降水量序列存在4 年、7 年、20 年、45 年左右的周期;年径流量序列存在3 年、7 年、19 年、50 年左右的周期;年输沙量序列存在4 年、6 年、11 年、16 年、46 年左右的周期;人类活动是引起蒙江流域年输沙量减少的主导因素。
Based on the daily precipitation data of 24 precipitation stations and the runoff and sediment data of Taiping station in Mengjiang river basin from 1960 to 2020,its seasonal and interannual variations of precipitation,runoff and sediment were analyzed.Its trend components were analyzed by using linear trend regression test,its mutation was analyzed by using Mann-Whitney-Pettitt mutation point analysis,and its periodic components were analyzed by Morlet wavelet analysis.The results showed that summer precipitation,runoff,sediment load and winter precipitation showed no obvious decreasing trend,the rest of the series showed no obvious increasing trend.Annual precipitation,annual runoff and annual sediment load showed no significant increasing trend,no significant mutation;the annual precipitation series showed the cycles around 4 years,7 years,20 years and 45 years;the annual runoff series showed the cycles around 3 years,7 years,19 years,50 years;the annual sediment load series showed the cycles around 4 years,6 years,11 years,16 years and 46 years.Human activities dominated the reasons for the decrease of annual sediment discharge in the Mengjiang river basin.
