CAJ | 학술논문

我国西北地区流域降水特性及趋势对当地雨养农业及水土流失有重要的影响。选用1981-2012年马莲河砚瓦川流域的降水量资料，以集中度、变差系数、逐年距平、M-K非参数统计检验以及滑动t检验等方法分析了降水年内、年际、突变变化特征。结果表明：砚瓦川流域降水量年内分配不均，集中度较高，降水多分布在7、8月；年际变化较小，流域多年平均降水量为523．0mm，变差系数约为0．2。 M-K非参数统计检验表明，整体变化趋势并不明显，与距平和变差系数分析的结果一致；滑动t检验和M-K检验的结果显示年降雨量序列没有出现突变值。
아국서북지구류역강수특성급추세대당지우양농업급수토류실유중요적영향。선용1981-2012년마련하연와천류역적강수량자료，이집중도、변차계수、축년거평、M-K비삼수통계검험이급활동t검험등방법분석료강수년내、년제、돌변변화특정。결과표명：연와천류역강수량년내분배불균，집중도교고，강수다분포재7、8월；년제변화교소，류역다년평균강수량위523．0mm，변차계수약위0．2。 M-K비삼수통계검험표명，정체변화추세병불명현，여거평화변차계수분석적결과일치；활동t검험화M-K검험적결과현시년강우량서렬몰유출현돌변치。
The characteristics and its tendency of rainfall in Northwest of China play an important role in rain-fed agriculture and soil and water erosion .The paper chose the data of rainfall in Yanwachuan basin from 1981 to 2012 and used concentration ratio , variation coefficient , anomaly , M-K non-parametric statistical test and moving t-test technique to analyze the intra annual variation , annual variation and mu-tation change of rainfall .The result showed that the distribution of monthly precipitation is not even .The concentration ratio is high and precipitation occurred mostly in July and August;the annual variation is small, the average precipitation of long year is 523 mm, variation coefficient of precipitation is about 0. 2.M-K mutation test showed that the trend of precipitation change is not obvious and the result is in ac -cordance with that of the analysis of anomaly and variation coefficient .The result of moving t-test tech-nique and M-K test showed that annual precipitation series has no abrupt change point .