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首页> 外文会议>USCID international conference on irrigation and drainage >PERFORMANCE EVALUATION OF SUBSURFACE DRAINAGE SYSTEM UNDER UNSTEADY STATE FLOW CONDITIONS IN COASTAL SALINE SOILS OF ANDHRAPRADESH, INDIA
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PERFORMANCE EVALUATION OF SUBSURFACE DRAINAGE SYSTEM UNDER UNSTEADY STATE FLOW CONDITIONS IN COASTAL SALINE SOILS OF ANDHRAPRADESH, INDIA

机译：印度沿海盐水沿海盐水土壤沿海盐水土壤下表面排水系统的性能评价

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The performance of an executed subsurface drainage system was evaluated under unsteady flow conditions. The impulse-response relation has been studied for two different conditions of drain spacings, namely, the executed drain spacing based on steady state flow conditions and the drain spacing proposed on unsteady state flow conditions, incorporating the effects of drainable porosity. It is found rational to use the "Dezeeuw-Hellinga model" for prediction of impulse response relations in terms of temporal water table fluctuations against rainfall – recharge under unsteady state flow conditions. The responses of a sub-surface drainage system for the impulse of incessant rainfall have been studied. The values of calculated drain spacings varied from 11 to 15 m. However, due to economic conditions, the practical drain spacings of the layout have been fixed at wider value of 35m and 55m. It is found that the drain spacings adopted for unsteady state flow conditions might have resulted in a better performance of the drains compared to steady state drain spacing as depicted by Dezeeuw-Hellinga model run. The drainable porosity being the vital parameter in an unsteady state equation, the Dezeeuw-Hellinga model was also used for varying levels of drainable porosity under given drain spacing conditions. Generally, the reference drainable porosity value is taken as 10 per cent for most of the drainage studies and the influence on drain outflows were compared for an increased value of 20 per cent and decreased value of 5 per cent, since the drainable porosity value in the study area varied from 5 to 20 per cent. It was found that the change in drainable porosity significantly influence the drain performance as depicted by Dezeeuw-Hellinga model run over all the3 standard week of year. The executed sub-surface drainage system has been found satisfactory in bringing down the soil salinity levels to desirable limits below 4 dSm~(-1). The executed sub-surface drainage system has also resulted in appreciable crop productivity improvements in the locality.
机译：在不稳定的流动条件下评估执行的地下排水系统的性能。已经研究了脉冲响应关系的两个不同条件的漏极间距，即基于稳态流动条件的执行的漏极间隔和在不稳定状态流动条件上提出的漏极间隔，包括可排水孔隙率的效果。在不稳定状态流动条件下，在不稳定的状态流动条件下，使用“dezeeuw-hellinga模型”来利用“dezeeuw-hellinga模型”以预测颞下水桌波动的脉冲响应关系。研究了对不间断降雨脉冲脉冲的副表面排水系统的响应。计算的漏极间距的值从11到15米变化。然而，由于经济条件，布局的实际排水间距已经固定为35米和55米。结果发现，与dezeeuw-hellinga模型运行所示的稳态漏极间距相比，用于不稳定状态流动条件的漏极间距可能导致漏极的更好性能。作为不稳定状态方程中的流动孔隙率，Dezeeuw-Hellinga模型也用于给定漏极间距条件下的可排水孔隙度的变化水平。通常，参考可排水孔隙率值为10％的排水研究，并将对排水流出的影响进行比较，以增加20％，减少5％，因为可排水孔隙率值学习区的5％至20％。结果发现，可排水孔隙率的变化显着影响了Dezeeuw-Hellinga Model在一年中的所有3个标准周内运行的漏极性能。已经发现所执行的子表面排水系统令人满意地使土壤盐度水平降至4dsm〜（-1）以下的理想限制。所执行的子表面排水系统也导致了本地的可观作物生产力。

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