Division and calculations of the artificial ecological water demand types in the New District of Lanzhou city
CHAI Yuanyuan1,2,3, XIONG Lifeng1, LUO Jinxuan1, ZHANG Runxia1,2,3
1. Institute of Soil and Water Conservation of Gansu, 730020, Lanzhou, China; 2. Northwest Institute of Eco-Environment and Resources, CAS, 730000, Lanzhou, China; 3. University of Chinese Academy of Sciences, 100049, Beijing, China
Abstract：[Background] The research of ecological water demand is very beneficial for the ecological irrigation practice and sustainable development and utilization of water resources in this region. [Methods] In this paper, the New District of Lanzhou city was taken as the study area, and the current artificial ecosystem of this region was divided into three categories that consisted of 13 sub-items in total through consideration of the similarities of ecosystem functioning and water demand characteristics by employing the ArcGIS 10.2 software technology. The water demand of these three categories in 2016, 2020, 2030, which included the vegetation, the artificial water body and the ecological type of urban construction, were calculated by utilizing different methodologies, respectively, such as the combination of the Penman-Monteith method and crop coefficients, the recharge and evaporation of water surface, water quota per unit area. The implementations of these calculations are on the basis of several data sources such as remote sensing image, meteorological data and the regional ecological planning, et al. [Results] 1) The total area of ecological water demand in 2016 was 39.55 km2, among of which, the ecological water demand of vegetation, artificial water body and urban construction were 24.57 km2, 5.22 km2 and 9.76 km2 respectively, the water demand quota were 675.5 mm, 820.3 mm, 731.0 mm, respectively. 2) The total ecological water demand in the study area in 2016 was 28.01×106 m3, including 16.6×106 m3 for vegetation, 4.28×106 m3 for artificial water body and 7.13×106 m3 for urban construction. 3) The total ecological water demand of the research area in 2020 was 55.79×106 m3, including 33.30×106 m3 for vegetation construction, 6.06×106 m3 for artificial water body and 16.43×106 m3 for urban construction. 4) The total ecological water demand of the research area in 2030 was 58.44×106 m3, including 35.20×106 m3 for vegetation, 6.81×106 m3 for artificial water body and 16.43×106 m3 for urban construction. [Conculsions] The ecological area and water demand are gradually increasing, and the departments should provide sufficient water resources for the artificial ecosystem according to the characters and weights of the water utilization of different ecology types, which can be beneficial for the stable development of ecological system.
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2020, Vol. 18 
