نوع مقاله : مقاله پژوهشی
1 دانش آموخته کارشناسی ارشد/ گروه مهندسی آب؛ دانشگاه بین المللی امام خمینی (ره)؛ قزوین؛ ایران
2 استاد/ گروه مهندسی آب؛ دانشکده فنی و مهندسی؛ دانشگاه بین المللی امام خمینی (ره)؛ قزوین؛ ایران
3 استاد /گروه مهندسی کشاورزی و بیوتکنولوژی، دانشگاه A&M تگزاس، کالج استیشن، امریکا
عنوان مقاله [English]
River flow regime is dynamic and comprises of different parts. Low flows, small floods, and high floods are the most important parts of the regime that play special roles in retaining the river in healthy conditions. Allocating the minimum environmental flow, as a fixed figure and disregarding the important components of the river regime, is common in river management in the country. The present research, noticing the imposed danger to environment through employing this policy and using the ideas embedded in Building Block Method (BBM) as a holistic method, obtained the river environmental flows under the condition of data shortage. The employed criteria used in this research for defining the required thresholds to achieve the proper regime were: providing living creatures in the river with appropriate hydraulic conditions, retaining river bed morphology, protecting main channel shape, saving riparian vegetation cover, and coinciding with the watershed climate. Based on results, wetted perimeter technique was employed when supplying drinking and industrial water, a combination of historical minimum discharge and Q95 was used when adding agricultural water, a 2-year flood was used for saving river morphology and flushing sediment from its bed, and a 5-year flood for supplying the river’s flood plains. The main achievement of this research was introducing a comprehensive ecological regime by defining the required thresholds for having a healthy river in an IWRM framework.