地理科学进展 ›› 2017, Vol. 36 ›› Issue (7): 864-872.doi: 10.18306/dlkxjz.2017.07.008
出版日期:
2017-07-31
发布日期:
2017-07-31
通讯作者:
张士锋
E-mail:lirui6553@163.com;zhangsf@igsnrr.ac.cn
作者简介:
作者简介:李瑞(1990-),男,河南济源人,硕士研究生,研究方向为水文水资源,E-mail:
基金资助:
Rui LI1,2,3(), Shifeng ZHANG1,2,*(
)
Online:
2017-07-31
Published:
2017-07-31
Contact:
Shifeng ZHANG
E-mail:lirui6553@163.com;zhangsf@igsnrr.ac.cn
Supported by:
摘要:
基流是河川径流的重要组成部分。在干旱半干旱地区,基流对于维持水源的稳定性及持续性、确定河流生态需水等方面具有重要作用。因此,基流分割结果的准确性至关重要。本文以黄河流域上游小流域为研究区,分别使用滑动最小值法和数字滤波法对典型年进行基流分割,然后用数字滤波法对1980-2014年日均径流进行基流分割,并分析基流的变化趋势。研究表明,数字滤波法在干旱半干旱地区具有较好的应用效果,滑动最小值法分割的基流结果偏小;在特定研究区的参数难以确定时,应结合两种方法的优点确定最佳的基流分割方案。研究区1980-2014年的平均基流指数为0.69,高于全国平均值0.26、西北诸河区的0.57及黄河区的0.43;趋势分析显示,研究区的年径流、基流、BFI的增长幅度分别为0.086 (m3/s)/10a、0.169 (m3/s)/10a、0.038/10a。MK趋势检验结果显示,年径流未通过10%的显著性检验,增长趋势不明显;基流和BFI分别通过了2.5%和1%的显著性检验,增长趋势显著。
李瑞, 张士锋. 两种自动基流分割方法在干旱半干旱地区的对比研究[J]. 地理科学进展, 2017, 36(7): 864-872.
Rui LI, Shifeng ZHANG. Comparative study on two automatic baseflow separation methods in the arid and semi-arid regions[J]. PROGRESS IN GEOGRAPHY, 2017, 36(7): 864-872.
表2
数字滤波法2012年基流分割结果"
滤波次数 | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 | |||||
最大基流/(m3/s) | 9.45 | 7.49 | 6.81 | 8.45 | 6.60 | 5.73 | 8.16 | 6.23 | 6.23 | 7.26 | 5.69 | 5.07 | 6.08 | 4.91 | 4.02 | ||||
最小基流/(m3/s) | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 | ||||
平均基流/(m3/s) | 3.16 | 2.95 | 2.81 | 3.03 | 2.76 | 2.58 | 2.98 | 2.67 | 2.68 | 2.89 | 2.54 | 2.30 | 2.71 | 2.24 | 1.89 | ||||
BFI | 0.89 | 0.83 | 0.79 | 0.85 | 0.77 | 0.72 | 0.84 | 0.75 | 0.69 | 0.81 | 0.71 | 0.64 | 0.76 | 0.63 | 0.53 |
表3
数字滤波法和滑动最小值法BFI比较"
数字滤波法 | 滑动最 小值法 | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 | ||||||
2011年 | 0.89 | 0.83 | 0.80 | 0.86 | 0.78 | 0.74 | 0.84 | 0.76 | 0.71 | 0.82 | 0.73 | 0.67 | 0.77 | 0.66 | 0.59 | 0.77 | ||||
2012年 | 0.89 | 0.83 | 0.79 | 0.85 | 0.77 | 0.72 | 0.84 | 0.75 | 0.69 | 0.81 | 0.71 | 0.64 | 0.76 | 0.63 | 0.53 | 0.79 | ||||
2013年 | 0.91 | 0.86 | 0.82 | 0.88 | 0.81 | 0.75 | 0.86 | 0.78 | 0.72 | 0.83 | 0.73 | 0.68 | 0.77 | 0.67 | 0.61 | 0.83 | ||||
2014年 | 0.86 | 0.80 | 0.76 | 0.83 | 0.75 | 0.70 | 0.81 | 0.72 | 0.68 | 0.78 | 0.69 | 0.64 | 0.74 | 0.63 | 0.57 | 0.73 |
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