哈尼梯田核心区水文要素变化特征分析

Analysis on Hydrological Element Changes in Core Area of Hani Terrace

选用元阳县新街镇1958~1996年的降雨量和蒸发量数据资料,收集哈尼梯田核心区主要河流的产水模数,运用距平分析等方法对梯田核心区水文要素进行分析计算.结果表明,元阳梯田核心区降雨、蒸发年内分配不均匀,年际变化趋势不显著.降雨主要集中在5~10月,占全年降水量的76.50%以上,蒸发量主要集中在3~8月,占全年蒸发量的62.96%以上,计算得出干旱指数为0.768 9,产水模数为63.94万m3/km2.

Collecting rainfall and evaporation data of the xinjie station in county of Yuanyang from 1958 to 1996,and the modulus of water production of major rivers in core area of Hani Terrace,the authors analyzed and calculated hydrological factors in core area of terrace using methods of equality analysis.The results showed uneven distribution of rainfall and evaporation,unobvious annual change trend in core area of Hani Terrace.Rainfall concentrated in May to October,accounting for more than 76.50% of annual precipitation.Evaporation concentrated in March to August,accounting for over 62.96% of annual evaporation.Drought index was calculated as 0.7689,model number of producing water was 639 400 m3 /km2.