| 重庆市主城区降雨侵蚀力特征分析 |
| |
| 引用本文： | 缪驰远,徐霞,魏欣,曾宪勤.重庆市主城区降雨侵蚀力特征分析[J].资源科学,2007,29(4):54-60. |
| |
| 作者姓名： | 缪驰远 徐霞 魏欣 曾宪勤 |
| |
| 作者单位： | 北京师范大学地理学与遥感科学学院,北京,100875;北京师范大学地表过程与资源生态国家重点实验室,北京,100875 |
| |
| 基金项目： | 国家重点基础研究发展计划(973计划) |
| |
| 摘 要： | 文章根据重庆市自建气象站以来的降雨过程资料(1954～2001)，对重庆市主城区降雨侵蚀力(R)及其特征进行了研究和分析。研究结果表明，研究区降雨侵蚀力主要集中在5月～9月，48年里研究区年降雨侵蚀力值变幅均较大，但从整体上来看，趋势保持平稳，其离差系数Cv和变化趋势系数r值分别为0.65和0.061； 研究区次降雨量与次降雨侵蚀力，月降雨量与月降雨侵蚀力均呈乘幂关系，而年降雨量与年降雨侵蚀力呈现指数关系； 为了解决在降雨资料不足的情况下对降雨侵蚀力的计算，文章利用不同的降雨资料与侵蚀力之间进行相关分析，最终确定了适合研究区的两种降雨侵蚀力简易算法。
|
| 关 键 词： | 降雨 侵蚀力 R值 算法 |
| 文章编号： | 1007-7588（2007）04-0054-07 |
| 修稿时间： | 2006-07-142007-02-26 |
Rainfall Erosivity in Urban Zone of Chongqing Municipality |
| |
| MIAO Chi-yuan,XU Xi,WEI Xin and ZENG Xian-qin.Rainfall Erosivity in Urban Zone of Chongqing Municipality[J].Resources Science,2007,29(4):54-60. |
| |
| Authors: | MIAO Chi-yuan XU Xi WEI Xin and ZENG Xian-qin |
| |
| Institution: | 1. School of Geography, Belting Normal University, Beijing 100875, China ; 2. State Key Lab. of Earth Surface Processes and Resource Ecology, Beijing Normal University, Belling 100875, China |
| |
| Abstract: | Rainfall erosivity is an important factor for predicting soil loss quantitatively. The paper studied on rainfall erosivity (R) and its characteristics in the Shapingba area of Chongqing city, based on the rainfall data from 1954 to 2001. The method for calculating rainfall erosivity factor (R) is based on the RUSLE(revised universal soil loss equation). Results show that the values of single rainfall erosivity change greatly; the contribution rate caused by several maximum rainfall erosivity is significant for total rainfall erosivity; the maximum value of single rainfall erosivity is 2.36% of the total value of rainfallerosivity among 48 years; the monthly rainfall erosivity mainly concentrated from May to September; the rainfall erosivity of this period is 91.13% of annual rainfall erosivity; the values of rainfall erosivity per year change greatly too. the paper used two indicators to describe the change of annual rainfall erosivity: the coefficient of changed trend r and the coefficient of variation Cv. By calculation, the coefficient of changed trend r is 0.061, the coefficient of variation Cv is 0.65. So the whole trend of the yearly erosivity value among 48 years is balanced. The single rainfall and single rainfallerosivity, the monthly rainfall and monthly rainfall erosivity are in exponential function relation, but the yearly rainfall and yearly rainfall erosivity is in index relation, the determinate coefficient R2 is 0.9687, 0.8921 and 0.4822 respectively. The paper, under the insufficient rainfall information simplify the calculation process and make use of the rainfall data and results in research area through correlated analysis to conclude two kinds of the simple arithmetic about rainfall erosivity finally, according to the results of determinate coefficient R2 and mean absolute percentage error (MAPE). For using the daily and the monthly rainfall to calculate the annual rainfall erosivity, the determinate coefficient R2 is 0.9181 and 0.8300 respectively, the calculated MAPE is 8.35% and 22.28%, which are obviously better than the others simple means. |
| |
| Keywords: | Rainfall Erosivity Index R Arithmetic |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《资源科学》浏览原始摘要信息 |
| 点击此处可从《资源科学》下载免费的PDF全文 |
|
