【摘要】 经过研究和比较，采用指标法界定了黄河中游多沙粗沙区的区域。全沙模数大于５ ０００ｔ／ ｋｍ２的地区为多沙区，粗泥沙模数大于１ ３００ｔ／ ｋｍ２ 的地区为粗沙区，既是多沙区又是粗沙区的地区即是多沙粗沙区。在经过内业分析、外业查勘和遥感图片对照修正后，确定多沙粗沙区面积为７ ．８６ 万ｋｍ２ 。更多还原

【Abstract】 By study and comparison, the area of both abundance with sand and coarse is delimited by the index method. The area with a total sand module bigger than 5?000?t/km 2 is determined as sand abundant area. That with coarse sand module bigger than 1?300?t/km 2 is determined as coarse sand area. The area, which is both sand abundant area and coarse sand area, is defined area of both abundance with sand and coarse sand. By indoor analysis,comparison and modification of remote sensing image and outdoor investigation, the total area of area of both abundance with sand and coarse sand is determined to be 78?600?km 2.更多还原