摘要
针对河道生态需水量的计算问题,以广西澄碧河水库下游河道为例,分别采用了3种不同的水文学计算方法进行了概算,并对传统Tennant法和月保证率法进行了适当改进。针对传统Tennant法的不足,对用水期进行了重新划分,同时引入修正系数对流量百分比进行了重新修正,使其更适用于河道的现实情况;此外对月保证率法的部分缺点也进行了两方面的改进,使其计算结果更加合理可靠。计算结果表明:3种方法均适用于该河道的生态需水量计算,在平水年(P=50%)情况下,利用改进的Tennant法和改进的月保证率法计算得到的河道适宜需水量分别为4.99×10~8m^3、3.80×10~8m^3。利用径流年内展布法得到的计算结果为3.17×10~8m^3,较以上两种方法偏小,但尚属合理范围之内,仍具有一定的推广使用意义。
In view of the calculation of ecological water demand in the river course, taking the downstream river channel of Chengbihe Reservoir in Guangxi as an example, three different hydrological calculation methods were used to estimate the ecological water demand, and the traditional Tennant method and the monthly guaranteed frequency method have been improved.Considering the shortcomings of the traditional Tennant method, the water use period is redivided, and the correction coefficient is introduced to revise the flow percentage to make it more suitable for the river.In addition, the monthly guaranteed frequency method has been improved in two aspects, so that the calculation results are more reasonable and reliable.The results show that the three methods all can be applied to the river ecological water requirement calculation.In normal years （P=50 %）, using the modified Tennant method and the improved monthly guaranteed frequency method to calculate the suitable water requirement of river, and the water demand are respectively 4.99×10^8m^3, 3.80×10^8m^3.In addition, by using the during the year distribution method we obtained results for 3.17×10^8m^3, which is relatively small compared to the above two methods, but within the reasonable limits, and still has some significance for extension use.
出处
《水资源与水工程学报》
CSCD
2017年第4期97-102,共6页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(51369005)
关键词
生态需水量
TENNANT法
月保证率法
年内展布法
澄碧河水库
ecological water demand
Tennant method
the monthly guaranteed frequency method
during the year distribution method
Chengbihe Reservoir
