摘要
为了预测南水北调西线一期工程实施对下游干旱河谷演变的影响,开展了对泸定县城以上大渡河流域干旱河谷区生态需水的研究,结果表明:①干旱河谷生态需水量为能够维系干旱河谷生态功能的基本环境目标、恢复干旱河谷生态景观的生态系统所需求的水量;②研究区干旱河谷总面积1185.00km2,其中干暖河谷250.11km2,干温河谷934.89km2;③考虑输沙需水时,维持研究区干旱河谷的最小生态需水量为156.3×108m3,其中干暖河谷最小为58.8×108m3,干温河谷最小为97.4×108m3,不考虑输沙需水时,最小生态需水量仅为58.3×108m3;④河道外需水量占总生态需水量的5.7%;⑤考虑输沙需水时,研究区干旱河谷的最小生态需水量占总地表水量的68.84%,不考虑输沙需水时其只占总地表水量的25.68%,对生态脆弱区生态需水进行计算时需考虑输沙需水。
In order to predict the impact of first phase of west route water transfer from south to north project on the evolution of the dry valleys downstream,we carried out studies on the ecological water requirement of the dry valleys in the upper reaches of the Dadu river and found that：1）Ecological water requirement of the dry valleys depends on the demand of water for maintaining ecological function and for restoring ecosystem;2）the area of the dry valleys （including woods,shrubs,nudity etc.）estimated using ARC GIS and ERDAS softwares is 1185.00 km^2,of which the dry-warm valley is 250.11km^2,and dry-mild valley is 934.89km^2;3）considering water requirement for sediment transportation,the minimum ecological water requirement is 15.63 billion m^3 in the 2000＇s,of which the dry-warm valley is 5.88 billion m^3,and the dry-mild valley is 9.74 billion m^3.If the water requirement for sediment transportation was neglected,the minimum ecological water requirement would be 5.83 billion m^3 in the 2000＇s,of which the drywarm valley is 2.10 billion m^3,and the dry-mild outside of the waterway occupied 5.7% of the considering water requirement for sediment valley is 3.73 billion m^3;4）water requirement total ecological water requirement;and 5）when transportation,the minimum ecological water requirement occupied 68.84% of the surface water amount and if the water requirement for sediment transportation was neglected,the minimum ecological water requirement would occupy 25.68% of the surface water amount.We suggest if ecological water requirement of fragile area was calculated,water requirement for sediment transportation should be taken into account.
出处
《自然资源学报》
CSCD
北大核心
2006年第2期252-259,共8页
Journal of Natural Resources
基金
"南水北调工程西线工程影响地区干旱河谷分布现状与影响分析"项目
中国科学院知识创新工程项目KZCX3-SW-339)
"西部之光"人才计划项目共同资助
关键词
生态
干旱河谷
人渡河上游
生态需水
ecology
dry valley
the upper reaches of the Dadu river
ecological water requirement
作者简介
王晶（1981-），男，山西新绛人，硕士生，主要从事水土保持、生态水文与水资源保护等研究。E-mail：wangjing256@126．com
通讯作者：Tel：028—85231656；E—mail：baowk@cib．ac．cn
