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Influence of Rainfall Run-off in hydrologic process on Non-Point Pollution

Agricultural Science & Technology 2012年第2期13卷 380-383,444页

作者：蒋金安娜张义李珏高乃云同济大学污染控制与资源化研究国家重点实验室上海200092 镇江市自来水公司江苏镇江212001 镇江市给排水管理处江苏镇江212001

[Objective] This study aimed to study on influence of rainfall runoff on non-point pollution and to reduce the pollution through control of the contamination produced from rainfall runoff. [Method] In order to explore effective methods to decrease non-point pollution, we conducted analysis on hydrological process of rainfall runoff, interaction mechanism between the process and non-point pollutants, the influence on non-point pollution and hydrological model application in the research. [Result] It was proved that rainfall runoff was the main factor of non-point pollution. Control from source strengthened clearing and controlling of non-point pollutants on the ground. Growing plants in slope effectively reduced the scour and erosion of rainfall runoff on soil. The study became simple thanks for the hydrological process. [Conclusion] The research indicated that non-point pollution would be effectively reduced through control of rainfall runoff.

关键词： Non-point pollution hydrologic process Rainfall run-off

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Problems in wavelet analysis of hydrologic series and some suggestions on improvement

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Progress in Natural Science:Materials International 2007年第1期17卷 80-86页

作者： WANG Hongrui, YE Letian, LIU Changming, YANG Chi and LIU Peng ( College of Water Sciences, Beijing Normal University, Beijing 100875, China Key Laboratory for Water and Sediment Sciences, Ministry of Education, Beijing 100875, China School of Mathematical Sciences, Peking University, Beijing 100089, China College of Engineering Sciences, University of Region, Canada) College of Water Sciences Beijing Normal University Beijing 100875 China Key Laboratory for Water and Sediment Sciences Beijing 100875 China School of Mathematical Sciences Peking University Beijing 100089 China College of Engineering Sciences University of Region Canada

Applying the wavelet theory and methods to investigate the hydrologic processes such as precipitation and runoff is a hot field. However, several aspects in research are usually ignored: the effect of admissible condition of wavelet functions and the disturbance of noises for the detection of periods, the effect of the length of a hydrologic time-series on the final result, and the choice between the anomaly and the original time series for wavelet analysis. In this paper, these issues are fully discussed. Precipitation data from Lanzhou Precipitation Station are taken for case study. The result indicates that in the wavelet analysis of hydrologic series, denoise methods should be used to eliminate the influence of noises. The MexHat wavelet function satisfies the admissible condition, which ensures that the periodic properties of hydrologic processes can be well represented by using the MexHat wavelet for decomposition. The affected range of hydro-logic series which should be discarded before analysis is given. It is also suggested that the anomaly series should be used to highlight the actual undulation of the hydrologic series.

关键词： wavelet analysis hydrologic process admissible condition noise period.

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Shrinking and Drying up of Baiyangdian Lake Wetland:A Natural or Human Cause?

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Chinese Geographical Science 2006年第4期16卷 314-319页

作者： LIU Chunlan XIE Gaodi HUANG Heqing Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beifing 100049 China

The shrinking and drying up of wetlands in arid and semiarid areas of China have been widely observed in the recent years, but there has been no consensus on whether the aggravation is caused by human activities or by global climate warming. For a better understanding of the cause, this study investigates the dynamic changes of Baiyangdian Lake wetland over the last 40 years. It is shown that since the 1980s, Baiyangdian Lake has suffered from an insufficient water input and shrunk considerably. By using SPSS 11.0, this study urines a detailed Analysis on the signifficance of the effects of the possible driving factors for the degradation. It is identified that the North China Plain has been warrnin~ up significantly in recent years, which causes a significant reduction in the precipitation and inflow to the lake. Although human disturbances such as the irrigation and storage of water in reservoirs do not play a decisive role, they accelerate the degradation and their effects should be minimized.

关键词： climate change human activities Baiyangdian Lake wetland hydrologic process North China Plain

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