| 引用本文: | 杨锋,和玉璞,洪大林,等.基于Hydrus-1D模型模拟灌排调控稻田地下水补给过程[J].灌溉排水学报,0,():-. |
| Yang Feng,He Yupu,Hong Dalin,et al.基于Hydrus-1D模型模拟灌排调控稻田地下水补给过程[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 【目的】进一步探究灌排调控稻田地下水补给特征及其响应机制。【方法】设置灌水下限分别为50%、60%、70%、80%饱和含水率的4种灌溉处理(分别记为I1、I2、I3、I4)和地下水埋深分别为30cm、50cm、70cm的3种排水处理(分别记为D1、D2、D3)进行灌排组合,基于Hydrus-1D模型开展细化灌排情景下稻田土壤水分通量模拟。【结果】模型对稻田不同深度土壤含水率模拟结果的RMSE在0.0096~0.0884之间、NES为0.0150~0.7983,稻季稻田土壤水-地下水转化量模拟值与实测值相对误差为4.6%,取得了良好的模拟精度,结合实测数据率定后的Hydrus-1D模型能够作为分析灌排调控稻田地下水补给特征的工具。稻田地下水补给峰值及总量呈随灌水下限降低而升高的趋势,I1处理下,典型时段内稻田地下水补给峰值的平均值分别较灌水下限为I2、I3、I4稻田提高50.42%、50.42%和92.93%,而稻田地下水补给总量分别平均提高了2.15mm、1.78mm、4.82mm。稻田地下水补给峰值及总量随地下水埋深的增加而降低,典型时段内D1处理稻田地下水补给峰值的平均值分别是D2、D3处理稻田的2.30倍、4.73倍,D3处理稻田地下水补给总量分别平均较D1、D2处理稻田降低了48.47mm、34.22mm。【结论】地下水埋深、灌水下限均显著影响了稻田地下水补给总量,且地下水埋深的影响强于灌水下限。在现行的节水灌溉水分管理模式下,通过设置减小地下水埋深的排水措施,可增强农田地下水补给过程,进一步调控作物需水以提高水稻水分利用率。 |
| 关键词: 稻田;节水灌溉;地下水补给;Hydrus-1D;地下水埋深 |
| DOI： |
| 分类号:S274 |
| 基金项目:国家自然科学基金项目（51609141），南京水利科学研究院中央级公益性科研院所基本科研业务费专项资金项目（Y920009） |
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| Effects of irrigation and drainage regulation on the capillary rise in paddy fields based on HYDRUS-1D simulation |
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Yang Feng1, He Yupu1, Hong Dalin1, Ji Renjing1, Xia Chaofan2
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1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute;2.Nanjing Yangtze River Management Office
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| Abstract: |
| 【Objective】In order to further explore the effects of irrigation and drainage regulation on the capillary rise in paddy fields. 【Method】Four irrigation treatments with lower limits of 50%, 60%, 70% and 80% saturated soil water content (denoted as I1, I2, I3 and I4, respectively) and three kinds of drainage treatments with groundwater depth of 30cm, 50cm and 70cm (denoted as D1, D2 and D3, respectively) were set for irrigation and drainage combinations . The Hydrus-1D model was used to simulate the soil water flux of paddy fields under the irrigation and drainage scenarios. 【Result】The Hydrus-1D model can properly simulate the different depth soil moisture content in paddy fields. The RMSE for the simulated results of different depth soil moisture content were between 0.0096 and 0.0884, and the NES were between 0.0150 and 0.7983. The relative error between simulated and measured values of transformation between soil water and shallow groundwater in paddy fields was 4.6%. The Hydrus-1D model could be an effective tool to simulate the capillary rise process in paddy fields regulated by irrigation and drainage management. The peak value and amount of capillary rise increased with the lower irrigation threshold. The average of capillary rise peak in I1 increased 50.42%,50.42% and 92.93% compared with that of I2, I3 and I4, respectively. While the total amount of capillary rise in I1 increased by 2.15 mm, 1.78mm and 4.82 mm compared with that of I2, I3 and I4, respectively. The peak value and total amount of capillary rise in paddy fields decreased with the increase of groundwater depth. The average of capillary rise peak in D1 was 2.30 times and 4.73 times of that in the D2 and D3, respectively. The total amount of capillary rise in D3 was 48.47mm and 34.22mm lower than that in D1 and D2, respectively. 【Conclusion】Groundwater depth and irrigation threshold both significantly affect the total amount of capillary rise in paddy fields, with the strongest impact factor was groundwater depth. By reducing the groundwater depth in paddy fields under the water-saving irrigation, which could effectively enhance the process of capillary rise. The regulation of capillary rise will be useful for improving water use efficiency in paddy fields. |
| Key words: paddy fields; water-saving irrigation; capillary rise; Hydrus-1D; groundwater depth |
