Abstract:

Openpit mining may cause negative ecological effects,such as water loss,soil erosion,secondary geological disaster,and their intensity is affected by geographical environment of mines.Because of huge numbers of openpit mines distributing and complex terrain in Jinsha River watershed,the negative ecological effects generated by mines might be aggravated by the fragile geographical environment.Thus the ecology suitability evaluation of mining conditions is of great significance for ecology protection in the watershed.Based on the spatial technology of remote sensing and geography information system,the spatial database of openpit mines in Jinsha River watershed (Yunnan part) has been built under ArcGIS environment.Then 10 typical openpit mines in the watershed were taken as case study objects.After the geographical environment of these openpit mines was compared and analyzed,various elements are taken into consideration for ecology suitability evaluation of mining conditions,such as,elevation index including geomorphology,altitude, slope,vegetation coverage,vegetation types and watershed location.Elevation methods are related to expert scoring and greyrelationship.The study obtains spatial distributing characterization and ecology suitability of mining conditions of the 10 typical openpit mines.The study result provides scientific basis for resources rational exploitation,utilization and ecology protection of openpit mines in Jinsha River watershed (Yunnan part