人民黄河
人民黃河
인민황하
Yellow River
2014年
10期
136-140
,共5页
暴雨%灌排模式%氮素运移%DRAINMOD-NⅡ%模拟
暴雨%灌排模式%氮素運移%DRAINMOD-NⅡ%模擬
폭우%관배모식%담소운이%DRAINMOD-NⅡ%모의
nitrogen transport%controlled irrigation and drainage mode%conventional irrigation and drainage mode%DRAINMOD-N Ⅱ%simulation
为探究暴雨后稻田排水与氮素流失规律，在宿迁市运南灌区试验基地开展了常规与控制灌排模式下暴雨后排水量及其 NO -3- N 和 NH +4- N 浓度的观测试验，并利用 DRAINMOD - N Ⅱ模型模拟排水量及其 NO -3- N 和 NH +4- N 浓度。实测结果表明：控制模式与常规模式相比，排水量减少4.2%~54.9%，NO -3- N 负荷减少39.9%~62.9%，NH +4-N 负荷减少30.0%~63.3%，表现为次降雨量越大，减排量越大。模拟结果表明：2种模式各次暴雨排水量模拟值的误差均在10.0%以内，4次暴雨排水总量模拟值的误差在5.0%以内；4次暴雨排出的 NH +4- N 与 NO -3- N 负荷模拟值常规模式最大误差为6.0%左右，控制模式误差均在5.0%以内，2种模式的相关系数 R 与效率系数 NS 指标均较好。采用控制灌排模式能够有效减少排水量，提高雨水利用效率，减少 NO -3- N 和 NH +4- N 流失；DRAINMOD - N Ⅱ模型能够有效地描述暴雨后稻田排水及氮素运移过程。
為探究暴雨後稻田排水與氮素流失規律，在宿遷市運南灌區試驗基地開展瞭常規與控製灌排模式下暴雨後排水量及其 NO -3- N 和 NH +4- N 濃度的觀測試驗，併利用 DRAINMOD - N Ⅱ模型模擬排水量及其 NO -3- N 和 NH +4- N 濃度。實測結果錶明：控製模式與常規模式相比，排水量減少4.2%~54.9%，NO -3- N 負荷減少39.9%~62.9%，NH +4-N 負荷減少30.0%~63.3%，錶現為次降雨量越大，減排量越大。模擬結果錶明：2種模式各次暴雨排水量模擬值的誤差均在10.0%以內，4次暴雨排水總量模擬值的誤差在5.0%以內；4次暴雨排齣的 NH +4- N 與 NO -3- N 負荷模擬值常規模式最大誤差為6.0%左右，控製模式誤差均在5.0%以內，2種模式的相關繫數 R 與效率繫數 NS 指標均較好。採用控製灌排模式能夠有效減少排水量，提高雨水利用效率，減少 NO -3- N 和 NH +4- N 流失；DRAINMOD - N Ⅱ模型能夠有效地描述暴雨後稻田排水及氮素運移過程。
위탐구폭우후도전배수여담소류실규률，재숙천시운남관구시험기지개전료상규여공제관배모식하폭우후배수량급기 NO -3- N 화 NH +4- N 농도적관측시험，병이용 DRAINMOD - N Ⅱ모형모의배수량급기 NO -3- N 화 NH +4- N 농도。실측결과표명：공제모식여상규모식상비，배수량감소4.2%~54.9%，NO -3- N 부하감소39.9%~62.9%，NH +4-N 부하감소30.0%~63.3%，표현위차강우량월대，감배량월대。모의결과표명：2충모식각차폭우배수량모의치적오차균재10.0%이내，4차폭우배수총량모의치적오차재5.0%이내；4차폭우배출적 NH +4- N 여 NO -3- N 부하모의치상규모식최대오차위6.0%좌우，공제모식오차균재5.0%이내，2충모식적상관계수 R 여효솔계수 NS 지표균교호。채용공제관배모식능구유효감소배수량，제고우수이용효솔，감소 NO -3- N 화 NH +4- N 류실；DRAINMOD - N Ⅱ모형능구유효지묘술폭우후도전배수급담소운이과정。
In order to explore the law of paddy field drainage and nitrogen loss after rainstorm,experiment of measurement and simulation by using DRAINMOD-N Ⅱ of drainage volume and the concentration of nitrate-N and ammonium-N in it under conventional and controlled irrigation and drainage mode after rainstorm was carried out in Yunnan irrigation area experimental base in the city of Suqian. Measured results show that compa-ring with conventional mode,the percentage reductions of drainage volume,load of nitrate-N and ammonium-N of controlled mode are 4. 2% ~54. 9% ,39. 9% ~ 62. 9% and 30. 0% ~ 63. 3% ,respectively. It shows that the more the individual rainfall,the more the emission reduction. The simulated results show that the errors between simulation and measurement of drainage volume under the two modes after each rainstorm are all less than 10. 0% ,the errors between simulation and measurement of the whole drainage volume after four rainstorms are within 5. 0% ;the maxi-mum of total relative error between the simulation and measurement of nitrate-N and ammonium-N load coming from four rainstorms under the con-ventional mode is about 6. 0% and the controlled mode is all less than 5. 0% ,the two modes are both perfect in correlation coefficient R and NS in-dex. The drainage volume,loss of nitrate-N and ammonium-N can be effectively decreased and the rainwater use efficiency can be increased by u-sing controlled irrigation and drainage mode;DRAINMOD-N Ⅱ can perfectly describe the process of paddy field drainage and nitrogen transport.
