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采用不同方法对黄河中游典型风沙滩河流海流兔河19572007年的径流资料进行了分析。采用年内分配不均匀系数法分析表明,海流兔流域径流年内分配均匀,集中度低。应用Mann-Kendall秩次检验法,证明年径流序列存在明显下降趋势。而同时期的降雨量不存在显著的趋势,且降水年内分配十分不均,主要集中在夏季的79月,冬季少雨。利用情势变化指数法（RSI）分析得到海流兔河年径流变化的几个阶段分别为19571967年、19681988年、19892000年、20012007年。通过对比降水资料和径流资料的变化趋势和年内分配,发现降水对径流变化的影响不明显。 相似文献
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For sustainable water resource management,it is important to determine the relationship between streamfl ow and other variables that infl uence availability of water resources.However,many catchments do not have suffi cient data to allow for a more detailed study of these relationships.We faced a similar challenge in the Chengcun Basin(limited historical data: from 1986–1999); and therefore we used a new approach to overcome this.We found that,using nonparametric trend methods in conjunction with the climate elasticity analyses and the 2D visualization of hydrologic data,it is possible to assess the relationships between streamfl ow and other hydro-climatic variables.In the past,streamfl ow trends in the basin were more correlated with precipitation than with potential evapotranspiration(PET).In addition,there is a gradual shift in the hydrological regime of the catchment,which may affect the occurrence of available water resources and activities that depend on them.In addition,based on our climate sensitivity analyses,the streamfl ow is dependent and more sensitive to variations in precipitation than to PET(δQ=0.79δP+0.42δE; precipitation elasticity,ε P=1.32; PET elasticity,ε E=-2.10).Therefore pending more detailed studies,the use of our approach will provide a rapid means to assess the variation of water resources(streamfl ow)in a watershed.In the future,we hope to carry out related research in other watersheds and also perform a more detailed studies to improve upon the results of this study. 相似文献
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湖泊生态水位是维持湖泊生态系统结构和功能完整性、维持生物多样性的最低水位,研究湖泊生态水位过程对湖区动、植物栖息地保护和湖泊水资源管理具有重要意义.利用高邮湖1953-2013年日水位资料进行生态水位计算分析,采用M-K法和滑动T法对1953-2013年年均水位进行突变检验,分析高邮湖1953-1992年来水文变化规律,结合年保证率法和年内展布法得到高邮湖逐月最低生态水位过程,并计算出高、低水位发生时间及历时,在此基础上对其1993-2013年生态水位保障程度进行研究.主要结论有:(1)高邮湖年均水位过程突变发生在1997年;(2)高邮湖高水位时期(7-10月)的最低生态水位为5.8 m,水位高于5.9 m的天数要达到111 d左右;低水位时期(12-次年3月)的最低生态水位为5.1 m,水位低于5.3 m的天数要达到96 d左右;其余月份最低生态水位为5.2 m;(3)高邮湖生态水位年内保障程度最低发生在7月,为60.83%,年际保障程度1994年和2001年最低,分别为49.59%和50.41%,低水位天数得不到保障. 相似文献
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