淮河中游北岸典型区产流规律分析

Rainfall-runoff Characteristics of Typical Area in North Shore Region of Huaihe Middle Reach

为了揭示淮河中游北岸地区的产流规律,针对该区域内的典型地区气候、地形、下垫面等特点,利用分布式水文模型在全区水循环模拟的基础上研究降水产流规律。结果表明,淮河中游北岸地区多年平均产流量空间分布极不均匀,处于51-749mm的较大范围内;年产流量不仅与当年的降水量有关,还与前一年的降水量有关;产流系数随降水量的增加而增大;不同土地利用类型的产流系数,以农田产流系数最小,居工地产流系数最大;产流系数在时间分布上也存在较大的年际变化,2003-2010年产流系数在0.24-0.36之间浮动。在全区域水循环的整体中分析降水产流规律,不仅方法上有所创新,且结果分析更加合理,应用于淮北平原具有一定的代表性。

A typical area in the middle reaches of the Huaihe river north shore area was selected as the study area, in view of the characteristics of the regional climate, topography and underlying surface, the water cycle in the study area was simulated using the distributed hydrological model, and then the rainfall runoff characteristics were studied in the whole water cycle. The results show that the spatial distribution of the annual average runoff is extremely uneven in the middle reaches of the Huaihe river north shore area, which fall into a wide range from 51 mm to 749 mm; annual runoffyield is not only related to the rainfall of the same year but also the previous year＇s rainfall; the runoff coefficient is in- creasing gradually with the increase of rainfall; different land use types have different rainfall-runoff characteristics, in which the farmland has the minimum value and the construction site has the largest value; in the aspect of time distribution, the annual runoff has a large interannual change, and the annual runoff coefficients fluctuate between 0.24-0.36 in the year 2003-2010. The analysis of rainfall-runoff rule in the whole regional water cycle is an innovative method, and its results are more reasonable. The application of this method in the study area has certain representativeness in Huaibei plain.