| 马英杰,沈冰,虎胆·吐马尔拜.蒸发影响下农田排水沟(管)间距的计算[J].水利学报,2006,37(10):1264-1269 |
| 蒸发影响下农田排水沟(管)间距的计算 |
| Spacing of drainage ditches in field under the influence of evaporation |
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| DOI： |
| 中文关键词: 潜水蒸发 泰勒公式 优化拟合 排水沟间距 |
| 英文关键词: phreatic evaporation Taylor formula optimum fitting spacing of drainage ditches |
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| 中文摘要: |
| 本文根据水量平衡原理建立考虑蒸发影响的地下水位下降的表达式，通过对设定的潜水下降速度函数V，应用泰勒公式展开并采用优化拟合的方法，分别得到取展开式前4项和前3项的作为简化的排水计算公式。应用该两公式对2种土壤的排水沟(管)间距进行了计算，通过与已被验证的实例计算数据对比，证明本文提出的计算有较高精度。结果表明：蒸发影响下的农田排水沟(管)间距比仅考虑排水作用时放大14.35～30.76m，潜水蒸发对排水沟间距有较大的影响。 |
| 英文摘要: |
| Based on the principle of equilibrium of water amount, an expression desribing the dropping down of groundwater table in consideration of evaporation is established. The function V expressing the dropping down speed of phreafic level is expanded into series by means of Taylor formula so that the expression can be simplified by the sum of the first four terms or first three terms of the series. The formula is applied to calculate the optimized spacing of drainage ditches in field for two kinds of soil. The validity of the calculated suitable spacing is verified by examples given by literatures. It is concluded that the spacing of drainage ditches will be enlarged by 14.35～30.76m,if phreatic evaporation is taken into account. |
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