桂林市桃花江流域生态环境需水量的初步研究

提出了桂林市桃花江流域生态环境需水量内涵，即为维护流域生态环境质量在时间上不下降所需要的最小水量。结合实地调研对桃花江流域生态环境需水量进行了初步研究，通过运用蒙大拿法（Montana method）等计算方法，计算得出：该流域河道外生态需水量为0．149亿m^3，占流域年均径流量的4％；河道内生态需水量为1．098亿m^3，占流域年均径流量的30％。本研究为当地水资源可持续利用与管理提供了依据，并可为类似地区生态环境需水研究提供借鉴。

Preliminary Study on Eco-environmental Water Demand in Taohuajiang Valley, Guilin

Eco-environmental water demand in Taohuajiang Valley of Guilin is defined as the minimum water volume required by the valley to maintain the eco-environmental quality not to be degraded over time.By using the site survey data,the eco-environmental water demand in Taohuajiang valley is studied preliminarily.The results calculated indicate that: the out-stream eco-environmental water demand is about 14.9 million m3 per year,about 4 percent of annual runoff of the valley;and the in-stream eco-environmental water requirement is about 109.8 million m3 per year,about 30 percent of annual runoff.This study provides scientific basis for local sustainable water resources use and management as well as for eco-environmental water requirement study in similar regions in terms of Karst geological condition and climate.