Analysis and modeling of watershed-scale nitrogen balance in relation to nitrogen pollution of unconfined groundwater in an alluvial fan

与冲积扇无承压地下水氮污染相关的流域尺度氮平衡分析和建模

• 批准号: 13660238
• 负责人: GOTO Akira
• 金额: $ 2.18万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13660238/
• 关键词: groundwater; water quality; nitrogen pollution; livestock excreta; hydrologic model; water quality hydrology; alluvial fan; 畜産糞尿

Field measurements on discharge and water quality of spring water were carried out for accumulation of necessary data. Amounts and processes of effluent nitrogen load from the different pollution sources were also investigated. As the results of nitrogen balance analysis, it was clarified that more than half of the total nitrogen load of the basin came from dairy farming and massive nitrogen from live stock excreta was stored on/in the soil and intruded into the groundwater together with rainwater infiltration. The fortunate fact that despite the high pollutant inflow, the nitrate nitrogen concentration does not reach 10mg/L, the environmental benchmark value, was found to be explained by dilution by the high groundwater recharge rate from the river underflow and paddy field infiltration.Based on the above results, modeling of groundwater quality processes was conducted. The model consists of a groundwater hydrologic model as the basic structure and a pollutant process model (behavior … More equations). As the basic hydrologic model, a lumped system groundwater model based on Tank Model and a distributed system groundwater model were prepared. For the first approach, a lumped system groundwater quality model was developed by combining the L-Q type and dissolution type of pollutant behavior equations to the lumped groundwater model. Application of this model showed that the model calculation could represent the seasonal change in nitrate nitrogen concentration fairly well.Meanwhile, since the distributed property of water quality in the basin cannot be represented by the lumped model, the research proceeded to the next step for developing a distributed system groundwater quality model. A grid type groundwater flow model was employed as the base structure and the same two types of pollutant behavior equations were incorporated. Further, distribution of pollution sources in the basin was handled with the input data. The result of this model could represent the tendency of spatial movement of nitrogen load. Less

对泉水流量和水质进行了实地测量，以积累必要的数据。研究了不同污染源的出水氮负荷量及其变化过程。氮平衡分析结果表明，该流域总氮负荷的一半以上来自奶牛养殖业，牲畜排泄物中的大量氮储存在土壤中，并随雨水渗入地下水。在此基础上，建立了地下水水质过程模拟模型，并对模拟结果进行了分析，结果表明，尽管污染物流入量很大，但硝态氮浓度没有达到环境基准值10 mg/L，这是由于河流底流和稻田入渗对地下水的补给率很高。该模型由地下水水文模型和污染物过程模型（行为模型）组成 ...更多信息 方程）。作为基本水文模型，建立了基于水箱模型的集总系统地下水模型和分布式地下水模型。第一种方法将L-Q型和溶解型污染物行为方程与集总系统地下水水质模型相结合，建立了集总系统地下水水质模型。应用结果表明，该模型计算能较好地反映流域内硝态氮浓度的季节变化，同时，由于集总模型不能反映流域内水质的分布特性，因此，本文进一步研究了分布式系统地下水水质模型。地下水流模型采用网格模型作为基本结构，并结合了两种污染物行为方程。利用输入数据对流域内污染源分布进行了处理。该模型的计算结果能较好地反映氮负荷的空间迁移趋势。少

项目成果

宗村広昭, 増田未生, 後藤章, 水谷正一: "那須野ヶ原における地下水窒素汚染の実態と汚濁機構の解明"農業土木学会論文集. No.219(70-3). 71-79 (2002)

Hiroaki Munemura，Mio Masuda，Akira Goto，Shoichi Mizutani：“那须野原地下水氮污染的实际情况和污染机制的阐明”日本农业和土木工程师学会学报第219（70-3）号。 79（2002）

後藤章: "モンスーン・アジアの水と社会環境(藤田和子編), カンボジア・アンコール地域の灌漑様式(第1章, pp.2-24)"世界思想社. 266 (2001)

Akira Goto：“季风亚洲的水和社会环境（藤田和子编辑），柬埔寨吴哥地区的灌溉方式（第 1 章，第 2-24 页）”Sekai Shisosha 266 (2001)。

Ali M.Elhassan, A.Goto, M.Mizutani: "Combining a tank model with a groundwater model for simulating regional groundwater flow in an alluvial fan"Transaction of JSIDRE. No.215(69-5). 21-29 (2001)

Ali M.Elhassan、A.Goto、M.Mizutani：“将水箱模型与地下水模型相结合，用于模拟冲积扇中的区域地下水流”JSIDRE 交易。

杉原知加子, 水谷正一, 中村智幸, 後藤章: "河川と水田水域に連結する人工池が魚類の生息に果たす役割"農業土木学会誌. Vol.69(9). 11-14 (2001)

Chikako Sugihara、Shoichi Mizutani、Tomoyuki Nakamura、Akira Goto：“与河流和稻田相连的人工池塘在鱼类栖息地中所发挥的作用”，日本农业和土木工程师学会杂志第 69 卷（9）。 11-14 (2001)

鈴木研二, 後藤章, 水谷正一, V.Sriboonlue: "東北タイにおける天水田の米生産量推定のためのモデル開発"システム農学. 18・(1). 55-60 (2002)

Kenji Suzuki、Akira Goto、Shoichi Mizutani、V.Sriboonlue：“泰国东北部雨养田稻产量估算模型开发”系统农业 18・(1)。