Bjerg, Poul Løgstrup

Brauns, Bentje

Jakobsen, Rasmus

Song, Xianfang

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Downloaded from orbit.dtu.dk on: Dec 20, 2017Nutrient and pesticide fate and transport in an agricultural soilgroundwatersurfacewater system at Fu River, ChinaBrauns, Bentje; Jakobsen, Rasmus; Song, Xianfang; Bjerg, Poul LøgstrupPublication date:2013Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Brauns, B., Jakobsen, R., Song, X., & Bjerg, P. L. (2013). Nutrient and pesticide fate and transport in anagricultural soilgroundwatersurface water system at Fu River, China. Poster session presented at InternationalInterdisciplinary Conference on Land Use and Water Quality (LuWQ 2013), Hauge, Netherlands.Baiyangdian LakeStudy siteNutrient and pesticide fate and transport in an agricultural soil→groundwater↔surface water system at Fu River, ChinaBentje Brauns (1),(2),(3) , Rasmus Jakobsen (4), Xianfang Song (2), Poul L. Bjerg (1)   Email: benb@env.dtu.dk(1) DTU Environment, Miljovej, Building 113, 2800 Kgs. Lyngby, DK; (2) IGSNNR, Chinese Academy of Sciences (CAS), 11A Datun Road, Beijing 100101, PRC; (3) Sino Danish Center (SDC), Niels Jensens Vej 28000 Aarhus C, DK; (4) GEUS, Oster Voldgade 10, 1350 Copenhagen, DKIntense wheat-maize cropping systems are thedominant agricultural land use around Fu River in northeasternChina. The perennial farming activities take place in closeproximity to deep and shallow groundwater production wellsand to Fu River, which - among other things - is used for duck-farming and fishing.The application of fertilizers and pesticides is necessary tomaintain agricultural productivity, but threatens the quality ofthe shallow groundwater and the surface water. A goodunderstanding of the transport and degradation processes ofthese contaminants and knowledge about the interactionbetween contaminated surface waters with groundwater istherefore crucial for risk assessment and for effective waterresource protection in this area.IntroductionThe study site is located at Fu River in Hebei Province near theBaiyangdian Lake area. Fu River is one of the major inflows to thelake.A small-scale monitoring network for investigation ofgroundwater chemistry and to tracking of keycontaminants was set up using small monitoring wellsfor shallow ground water (screened at 3m depth) andsoil water samplersThe two sampling lines showed some differences in groundwater chemistry at the wells located closest to the riparian zone(Wa1 and Wb1). Most significantly, lower values of phosphorusand of potassium were observed at Sampling Line B.This might be attributed to uptake by the vegetation (reed andalgae), which is more abundant at this location.The aims of the study are:• To identify flow and transport processes on site• To compare water chemistry among  different riparian zones (reed growth/no reed growth)• To assess if the transfer and/or the degradation  of contaminants differs depending on the local riparian vegetationTo obtain an understanding about the transport and fate of theagricultural key contaminants, a typical wheat-maize rotation inthe agricultural region of Hebei Province, China, was chosen asstudy site.Study aimsStudy site and set-up Preliminary results IConclusions and further workPreliminary results IIMany thanks to: Xiangmin Sun(2), Bing Zhang(2), Wenjia Wang(2), Baogang Jiang(2) and Yilei Yu(2) for their generous help with all field work.Divers were installed at 5 piezometers in the western part ofthe study site from November 2012 to June 2013. The obtaineddata incicates water flow from Fu River into the shallow aquiferwith a hydraulic gradient from 0.8 to 1 cm/m (increasing afterthe sprouting of the winter wheat in the springtime).Temperature measurements and water chemistry data alsosupport this conclusion.(modified after  Yang et al. 2012) (modified from googlemaps 2012)The preliminary results of this study indicate that the differentvegetation along the riparian zone causes different hydrochemicalconditions. This may influence the transport and degradation ofagricultural pollutants.Much of the presented work is still in its initial stage and furthermeasurements have to be taken to confirm this. Also, someparameters, including the concentration of various pesticides, havenot been analyzed yet.Before commencement of the study, theexpected flow condition was a hydraulic gradientfrom the field toward Fu River. However,extensive rainfalls in fall 2012 all over theNorthern China Plain have let to extremely highwater levels in the local surface water bodies.Therefore, pollutants entering the ground watersystem the surface water may become of higherpriority for this study, than initially expected.References: Yang, W.; Yang, Z.F; Zheng, C. (2012): Sustainable environmental flow management based on lake quality protection: The case of Baiyangdian Lake, China. In Procedia Environmental Sciences 13, pp. 730–741.

Nutrient and pesticide fate and transport in an agricultural soil→groundwater↔surface water system at Fu River, China

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Nutrient and pesticide fate and transport in an agricultural soil→groundwater↔surface water system at Fu River, China

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