摘要
结合东北地区水文模型的土壤含水率和径流以及实测气温、降水等资料,文章分别选取了能够表征水文干旱、农业、气象的标准化径流指数SRI、降雨蒸散发指数SPEI和土壤含水率距平指数SMAPI,然后对3种干旱指数之间的时空关联性和干旱过程反映特征进行研究分析。研究表明:对干旱识别较为敏感的指数为SPEI,而SMAPI对干旱过程的刻画较为稳定,SRI对水文干旱变化较为平缓;相对于SMAPI和SRI指数,SPEI指数所反映的干旱范围和等级较大,相对于水文和农业干旱,气象干旱的发展较为严重,SMAPI和SRI指数在不同时间尺度上的空间分布状况存在明显的差异;3种干旱指数之间具有密切的相关性,其中SMAPI与其他两个指数的相关性最高。
Combined with the soil moisture, runoff and the observed temperature and precipitation data about the hydrological model of the northeast region, this study selected respectively the standardization runoff index SRI, rainfall runoff evapotranspiration index anomaly index SMAPI and soil moisture SPEI, which could characterize the hydrologic drought, agriculture and meteorology, and then to analyze the spatio-temporal correlation between three kinds of drought indexes and drought process reflection characters. The results show that the index can identify sensitively the drought is SPEI, SMAPI can characterize the drought process stably, SRI can describe smoothly the change of hydrological drought; comparable to SMAPI and SRI, the drought scope and grade reflected by SPEI is big, comparable to hydrology and agricultural drought, the development of meteorological drought is more serious, there are obvious difference between spatial distribution state in different times of SMAPI and SRI. There is a close correlation between the three kinds of drought indexes, of which, SMAPI has a significant correlation with other indexes.
作者
刘立杰
LIU Li-jie(Suizhong County Water Resources Office, Huludao 125200, China)
出处
《黑龙江水利科技》
2018年第3期128-131,共4页
Heilongjiang Hydraulic Science and Technology
关键词
干旱指数
时空特征
相关性
东北地区
drought index
spatiotemporal characteristics
correlation
northeast region
