Impacts of rainfall events on runoff water quality in an agricultural environment in temperate areas

被引：67

作者：

Delpla, Ianis ^{[1
]}

Baures, Estelle ^{[1
]}

Jung, Aude-Valerie ^{[1
,2
]}

Thomas, Olivier ^{[1
]}

机构：

[1] Sch Adv Studies Publ Hlth, Environm & Hlth Res Lab, F-35043 Rennes, France

[2] Sch Environm Engn, F-35170 Bruz, France

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2011年 / 409卷 / 09期

关键词：

Rainfall events; Runoff; Organic carbon; Fertilizers; Water quality; DISSOLVED ORGANIC-CARBON; INTERRILL EROSION; STORM EVENTS; LAND-USE; SURFACE; SOILS; MATTER; RIVER; PHOSPHORUS; CATCHMENT;

D O I：

10.1016/j.scitotenv.2011.01.033

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Since a rise in dissolved organic carbon (DOC) concentrations has been observed for surface waters at least over the last two decades, a change in weather conditions (temperature and precipitations) has been proposed to partly explain this increase. While the majority of DOC delivery from soils to stream occurs during rainfall events, a better understanding of the rainfall influence on DOC release is needed. This study has been conducted in Brittany, western France, on agricultural experimental plots receiving either cattle manure (CM) or pig slurry (PS) as fertilizers in accordance with local practices. Each plot was instrumented with a flow meter and an auto sampler for runoff measurements. The results show that export of DOC during high intensity events is higher than during lower intensity rainfalls. Fertilization has a noticeable impact on total organic carbon (TOC) fluxes with an increase of five to seven folds for PS and CM respectively. If TOC shock load occurs shortly after the rainfall peak, DOC maximum appears with the first flush of the event. Organic carbon (OC) is mainly under colloidal (41.2%) and soluble (23.9%) forms during the first stage of a rainfall event and a control of rainfall intensity on OC colloidal transport is suggested. These findings highlight the potential risk of receiving water quality degradation due to the increase of heavier rainfall events with climate change in temperate areas. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：1683 / 1688

页数：6

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