[1]DUAN Yi-zi,BAI Xiao-li.Response of Runoff to Precipitation in Zhifanggou Small Watershed of Pingliang City in Recent 50 Years[J].Research of Soil and Water Conservation,2013,20(03):135-138.
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Response of Runoff to Precipitation in Zhifanggou Small Watershed of Pingliang City in Recent 50 Years
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
20
Number of periods:
2013 03
Page number:
135-138
Column:
Public date:
2013-06-28
- Title:
- Response of Runoff to Precipitation in Zhifanggou Small Watershed of Pingliang City in Recent 50 Years
- Keywords:
- Zhifanggou small watershed; precipitation; runoff; response
- CLC:
- P333.3;P333.5;P458.1
- DOI:
- -
- Abstract:
- In accordance with the observation information of annual precipitation and runoff during 1955—2002 in the Zhifanggou small watershed, the response of runoff to rainfall was analyzed by the ways of time series analysis and statistical regression analysis. The results indicate that:① distribution of precipitation is uneven during a year, highlighting the single peak value; ② precipitation in inter-annual-year shows as cyclical changes as flat water years-years of drought-flat water years compared with wet years; ③ monthly runoff change is basically consistent with the monthly change trend of precipitation, the peak value of runoff emerges more later in a short period than the maximum precipitation in the same cycle period and runoff varies widely in years; ④ runoff depth on the seasonal distribution is quite different, mainly concentrating in summer and autumn, accounting for 86.2% of the annual total value, only 13.8% of that in spring and winter; ⑤ average values of runoff show a downward trend whether seasonal or monthly; ⑥ when annual precipitation increases or reduces by 10% or 20% or 30%, annual runoff depth shows positive response of increasing or a decreasing by 23.29%, 46.59%, 69.88%,respectively; ⑦ with the passage of time and the improvement in the level of watershed management, watershed runoff and runoff depth are going to reduce accordingly and runoff depth shows a downward trend overall as well.
- References:
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1900-01-01