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高羊茅草地地表径流系数影响因素研究

魏小燕 毕华兴 霍云梅 肖聪颖 杨晓琪

魏小燕, 毕华兴, 霍云梅, 肖聪颖, 杨晓琪. 高羊茅草地地表径流系数影响因素研究[J]. 北京林业大学学报, 2017, 39(5): 82-88. doi: 10.13332/j.1000-1522.20160305
引用本文: 魏小燕, 毕华兴, 霍云梅, 肖聪颖, 杨晓琪. 高羊茅草地地表径流系数影响因素研究[J]. 北京林业大学学报, 2017, 39(5): 82-88. doi: 10.13332/j.1000-1522.20160305
WEI Xiao-yan, BI Hua-xing, HUO Yun-mei, XIAO Cong-ying, YANG Xiao-qi. Study on the factors influencing surface runoff coefficient in Festuca arundinacea grassland[J]. Journal of Beijing Forestry University, 2017, 39(5): 82-88. doi: 10.13332/j.1000-1522.20160305
Citation: WEI Xiao-yan, BI Hua-xing, HUO Yun-mei, XIAO Cong-ying, YANG Xiao-qi. Study on the factors influencing surface runoff coefficient in Festuca arundinacea grassland[J]. Journal of Beijing Forestry University, 2017, 39(5): 82-88. doi: 10.13332/j.1000-1522.20160305

高羊茅草地地表径流系数影响因素研究

doi: 10.13332/j.1000-1522.20160305
基金项目: 

国家水体污染控制与治理重大专项 2013ZX07304-001

科技创新服务能力建设-协同创新中心-林果业生态环境功能提升协同创新中心 PXM2016_014207_000083

详细信息
    作者简介:

    魏小燕。主要研究方向:林业生态工程。Email: 1976835739@qq.com   地址:100083 北京市海淀区清华东路35号北京林业大学水土保持学院

    责任作者:

    毕华兴, 教授。主要研究方向:水土保持与林业生态工程。Email: bhx@bjfu.edu.cn   地址:同上

  • 中图分类号: S715-3

Study on the factors influencing surface runoff coefficient in Festuca arundinacea grassland

  • 摘要: 高羊茅作为我国北方典型冷季型城市草坪草,具有调蓄雨水的作用。为了进一步深入研究北方高羊茅草地的降雨径流,本文采用人工模拟降雨试验,研究了高羊茅草地在不同覆盖度(60%和90%)及不同雨强(30、60和90mm/h)条件下的径流系数变化过程及其与影响因子之间的关系,并用裸地作为对照,得出高羊茅草地在不同试验条件下的径流系数削减率。研究结果表明:1)高羊茅草地初始产流时间随雨强增加逐渐提前,随着覆盖度的增加逐渐延长,同时,雨强越大初始产流时间提前幅度越小,覆盖度越大草地延缓初始产流时间的效果越明显;2)裸地和高羊茅草地的径流系数随降雨时间变化规律相似,均随降雨时间的延长先迅速增加后逐渐变缓,经过拟合裸地及高羊茅草地的径流系数与降雨时间均呈对数关系;3)高羊茅草地地表径流系数随着覆盖度的增加而降低,随着雨强的增加而增加,且覆盖度越低雨强对径流系数的影响越显著,反之则越不显著;4)高羊茅草地对径流系数的削减能力有限,随着雨强的增加两种覆盖度草地径流系数削减率越相近,在雨强为30、60和90mm/h时两种覆盖度草地径流系数削减率分别相差25%、24%和23%;5)建立试验条件下高羊茅草地径流系数与降雨强度、覆盖度、降雨时间的回归方程,经过验证,方程可用于试验条件下高羊茅草地径流系数的预测。

     

  • 图  1  不同雨强下草地及裸地径流系数过程

    Figure  1.  Process of runoff coefficient of grassland and bare land under different rainfall intensities

    图  2  径流系数模型预测值与实测值对比

    Figure  2.  Comparison in the predicted and measured values of runoff coefficient

    表  1  高羊茅草地及裸地初始产流时间

    Table  1.   Initial runoff time of Festuca arundinacea grassland and bare land

    覆盖度
    Coverage
    坡度
    Slope degree/(°)
    雨强
    Rainfall intensity/(mm·h-1)
    初始含水率
    Initial moisture content/%
    初始产流时间
    Initial runoff time/min
    裸地Bare land 5 30 24.8 20
    60 24.9 8
    90 24.8 2
    60% 5 30 24.9 60
    60 25.9 10
    90 24.8 4
    90% 5 30 24.8 63
    60 24.8 30
    90 25.3 11
    下载: 导出CSV

    表  2  径流系数与降雨时间的回归分析

    Table  2.   Regression analysis on rainfall and runoff coefficient

    雨强
    Rainfall intensity/(mm·h-1)
    覆盖度
    Coverage
    回归方程
    Regression equation
    R2
    30 裸地Bare land r=0.3069lnt-0.8909 0.9859
    60% r=0.3822lnt-1.5682 0.9968
    90% r=0.2290lnt-0.9409 0.9923
    60 裸地Bare land r=0.3557lnt-0.6004 0.9400
    60% r=0.2702lnt-0.6249 0.9975
    90% r=0.3523lnt-1.2194 0.9985
    90 裸地Bare land r=0.2251lnt+0.0943 0.9579
    60% r=0.2733lnt-0.4488 0.9901
    90% r=0.3104lnt-0.8705 0.9885
    下载: 导出CSV

    表  3  高羊茅草地对径流系数的削减能力

    Table  3.   Reducing capability of F. arundinacea grassland on runoff coefficient

    试验条件
    Experiment condition
    裸地场降雨径流系数
    Runoff coefficient of bare land
    草地场降雨径流系数
    Runoff coefficient of grassland
    径流系数削减率
    Reduction rate of runoff coefficient/%
    60%覆盖60% coverage 雨强30mm/h Rainfall intensity 30mm/h 0.66 0.4 39
    雨强60mm/h Rainfall intensity 60mm/h 0.89 0.57 36
    雨强90mm/h Rainfall intensity 90mm/h 0.97 0.68 30
    90%覆盖90% coverage 雨强30mm/h Rainfall intensity 30mm/h 0.66 0.24 64
    雨强60mm/h Rainfall intensity 60mm/h 0.89 0.36 60
    雨强90mm/h Rainfall intensity 90mm/h 0.97 0.46 53
    下载: 导出CSV
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  • 收稿日期:  2016-09-28
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