黑河流域降水量年内分配格局研究

用黑河流域降水量实测资料,具体分析了黑河流域降水量年内分配分布格局,研究表明:黑河流域多年平均连续最大四个月降水量占全年降水量的70%左右,连续最小四个月降水量占年总量的5%左右,其余各月降水量分配较为均匀。但各区域受所处地理位置、地形,地貌和季节性气候特点的影响,降水量年内分配存在一定的差异,年内变幅由东南向西北、从高海拔区向低海拔区递减,不均匀系数和集中度深山区最大,绿洲灌溉区又大于北部荒漠区,浅山区最小;流域内降水量集中期出现在7月17日前后,各分区仅相差1天,深山区最早,浅山区最迟。

Study on the Annual Distribution Characteristics of Precipitation in Heihe River Basin

The paper is based on the actual precipitation data,specifically analyzes the annual distribution characteristics of precipitation in Heihe river basin.The results indicates that the mean precipitation amounts of maximum continuous four months occupied about 70% of that in the year,the minimum about 5% occupied,while the other monthly precipitation were fairly well-distributed.There were some differences in the precipitation annual distribution in different areas because of the impacts of geographical position,topography,geomorphology and seasonal climatic characteristics.The annual variation amplitudes of precipitation decreased from southeast to northwest,as well as high altitudes to low altitudes.Non-uniform coefficient and concentration degree of precipitation were largest in the deep mountain areas,the larger in the oasis irrigation areas than that of the northern desert regions and the least in shallow mountain areas.The concentration period of precipitation was about July 17,there was only a difference of one day in different catchment’s divisions.It was the earliest in deep mountain areas and the latest in shallow mountain areas.