砂姜学名是碳酸钙结核,其成分同石灰岩,属弱可溶性盐类,因为它形似姜,硬如石,糙如砂,当地群众称它为砂姜石,简称砂姜。它是淮河流域具体地球化学环境和气候条件下的特殊产物,它次生充填于粘性土的旱干裂隙中,生长在潜水位变动带,它的厚度与潜水位变化幅度值相吻合,一般为1～2米左右。砂姜在淮河流域普遍分布并形成一个较稳定的潜水含水层位。在淮河干流以北沙颍河一带,由于砂姜遭受溶蚀地质作用,在地表以下8米深处已形成地下暗河,砂姜岩溶普遍发育,其溶蚀作用十分强烈,溶蚀率在20％左右。沙颍河底直切砂姜岩溶带,河水直接与沿岸潜水含水层相通连,洪水期间,河水位上涨,河水大量补给地下水,从漯河市到周口市之间的流程洪水流 Sand ginger scientific name is calcium carbonate tuberculosis, its composition with limestone, is a weak soluble salts, because it is shaped like ginger, hard as stone, rough as sand, local people call it sand ginger, referred to as sand ginger. It is a special product under specific geochemical environment and climatic conditions in the Huaihe River Basin. It is secondary filled in the dry and dry fissures of cohesive soil and grows in the changing zone of phreatic level. Its thickness agrees with the changing range of phreatic level, generally About 1 to 2 meters. Sambac ginger is widely distributed in the Huaihe River Basin and the formation of a more stable aquifers. In the area along the Shaheying River in the north of the Huaihe River, due to erosion and geology of samara, underground underground river has been formed at depth of 8 meters below the earth’s surface. Sand ginger karstification has been widely developed and its dissolution is very strong with dissolution rate of about 20%. Shaying the bottom of the river sand karst straightening cut straight, the river directly connected with the coastal aquifer submersion, the flood period, the river level rise, a large amount of groundwater supply groundwater, flood flow from Luohe City to Zhoukou City