论文部分内容阅读
云南省广南县60%的农田处于石灰岩地区,通常在灌区两侧石灰石较集中,中间为凹地小坝子,面积一般在33.3～133.3hm~2(500～2000亩)左右,并且小坝子一个接一个,灌区形成长条带状。这样的灌区若是修建灌溉渠道,需建左右灌渠才能满足灌区的要求,而修建盘山渠道土石方开挖量又较大,衬砌防渗投资较高,因此解决石灰岩地区农田灌溉是一个难题。
60% of the farmland in Guangnan County of Yunnan Province is in the limestone area. Limestone is usually concentrated on both sides of the irrigation area with a small concave bar in the middle, with an area of 33.3 ~ 133.3hm ~ 2 (500 ~ 2000 mu), and a small bar A, the irrigation area to form a long ribbon. If irrigation channels are to be constructed in such irrigation areas, irrigation channels should be built around the irrigation districts to meet the requirements of the irrigation districts. However, excavation of the earthworks and stones in the Panshan Canal Road is larger and the seepage prevention investment in linings is higher. Therefore, solving the irrigation problems of farmland in limestone areas is a problem.