以环县为例的黄土高原半干旱区景观化集水造绿的水绿调配规划与增长机制

文章以黄土高原东部半干旱区环县的人居环境为研究对象,在景观化集水造绿空间网络构建的基础上,基于水绿双赢理论,提出了以GIS空间分析技术为支撑的不同汇水区之间的平衡援助策略;指出根据区域内可收集雨水资源量,应优先保证该区域内优势节点和路径中集水造绿的生态需水,提出了测定区域内水绿平衡人为干预度临界点的方法;划分了大、中、小尺度汇水区,指出应根据各汇水区在人为干预度临界点的盈余和亏缺情况进行水绿调配规划;提出了近期、中期、远期的发展进程,预测了集水造绿区域的变化趋势。研究证明,以28.35%的人为干预度收集雨水,可以优先保证集水造绿优势"节点+路径"区的植物生长;将盈余区域的雨水收集调配至亏缺的汇水区,优先满足区域内节点、路径的生长,可以实现平衡援助;随着循序渐进的平衡增长,景观化集水造绿的空间网络可逐渐实现,以此作为人居环境改善的核心区域。

Water-Green Recombination Planning and Its Growth Mechanism in Semi-arid Regions of Loess Plateau and Its application to Huanxian County

On the basis of Trilism of"human settlements context- human settlements activities- human settlements construction",this paper,taking the human settlements in semi-arid region of the east part of the Loess Plateau as the research subject,used the spatial network construction theories to: 1) present the associate balance strategy for various landscape catchment areas in terms of GIS spatial analysis technologybased on the water-green win-win theory; 2) prioritize the ecological water demanded for advantage nodes and paths for water collection and greening,and generate the method to measure the critical point of artificial regulation degree according to the collectible rainwater resource; 3) divide catchments at large,medium,and small scales,makes a water-green recombination planning in terms of the surplus or deficit at critical point of artificial regulation degree among different catchment areas; 4)schedule the short-term,medium-term,and long-term development procedure to project the growth tendency of catchment and greening area. The findings showed that collecting rainwater at the 28. 35% artificial regulation degree can preferentially ensure the sustainable growth of "nodes + paths"in advantageous catchment and greening area; recombine the rainwater in the surplus area,and transfer it to the deficit area,which can first realize the associate balance in the node and path area; with the gradualbalance growth,the spatial network of landscaped catchment and greening areas can be created,which can be the core area of human settlements improvement.