The Evidence of the Fountainhead of the Xilamulun River in Late Pleistocene

In the period of the water resources evolutionary investigation of North China, from the 3-D map composed of TM and DEM, the downstream of the Xilamulun river is the wide Kailu basin, with huge alluvial-lacustrine sandy sediments which constitute great Xiliaohe plain, but the watershed area has not sufficient water and sand-soil sediments enough to form such present huge sedimentary plain in theory. By studying the predecessor data, outside investigation and applying the 3S technology, it believed that the present west watershed boundary of the Xilamulun river is not the real watershed one in history, the fountainhead should be the huge of alluvial-lacustrine basin on the west of the present west watershed boundary, this basin had enough water and sediments to meet the material and power to form the huge downstream sediment plain, this study provides the theoretical base and the direction to administrate the water environment of Xilamulun river.