论文部分内容阅读
山东滨海盐渍土地区,地面低平,地表、地下迳流迟缓,排水不畅,潜水位高,矿化度大,土壤含盐重,蒸发强烈,盐渍危害是影响农业生产的突出问题。尤其是面积占60％以上的轻质土地区,多年来在排水方式上曾采用过明沟排水和竖井排水,但因明沟边坡易于坍塌变形,深度不易维持,严重影响排水能力。竖井排水,又因地表10—12米以下有4—6米厚粘土隔层,上下水力联系徽弱,单井出水量只有10—20立米/小时,矿化度20—30克/开,大部为海水型高矿化地下水,对表层潜水降落影响范围只有30—60米,排水改碱效果不明显。 从1978年起在打渔张灌区四干新六支范围,滨海砂壤土地区开展暗管排水改良盐渍土的试验研究,取得了较好的效果,农业生产效益比较显著,为滨海引黄灌区排水改碱开辟了一条新途径。 本文从暗管排水降低潜水位,提高排蒸比,促进土体脱盐和潜水淡化等方面分析了暗管的排水排盐效果,同时对工程投资及产品进行了经济效益分析。
Shandong coastal saline soil area, low ground, surface, subsurface slump, poor drainage, high water level, salinity, heavy soil salt, strong evaporation and salinization are the prominent problems affecting agricultural production. Especially in the light-land areas that occupy more than 60% of the area, drainage and shaft drains have been used for drains over the years. However, because the gully slopes tend to collapse and deform, the depth can not be easily maintained, seriously affecting the drainage capacity. Shaft drainage, and because of the surface of 10-12 meters below the 4-6-meter-thick clay compartment, up and down the hydraulic linkage weak, single well water discharge is only 10-20 cubic meters / hour, salinity 20-30 g / open, most For the seawater mineralization of high groundwater, surface submersion impact on the scope of only 30-60 meters, the effect of drainage to change the base is not obvious. Since 1978, in the area of Zhanggan irrigation in the Zhangyu irrigation area, six pilot experiments were carried out to study the effect of underground pipe drainage on the improvement of saline soil. The results showed that the agricultural production efficiency was significant, Drainage to alkali opened up a new way. This article analyzes the drainage and salt removal effect of underground pipe from the aspects of underground pipe drainage to reduce diving position, increase steam discharge ratio, promote desalination of soil and desalination, and at the same time analyzes the economic benefits of project investment and products.