基于AgentLA模型的农田精准灌溉管理分区研究

Study on Precision Irrigation Management Zones in Farmland According Agent-based Model for Optimal Land Allocation

依据农田水资源利用与土地资源开发的耦合特性,开展农田精准灌溉管理分区研究,划定需灌溉管控的农田利用对象区。以三江平原典型流域挠力河流域为研究区,基于Landsat OLI影像、DEM数据和气象台站等多源数据为基本信息源,结合遥感和GIS技术定量探讨该流域农田水分盈亏状态,最后利用多智能体的空间优化配置模型(AgentLA)划定出农田灌溉区。结果表明:与常规的密度分割法相比,AgentLA模型不仅考虑了农田水分盈亏状态,也兼顾空间形态属性,使得所划定的灌溉区既覆盖了高水分亏缺状态农田,也具备较高的紧凑性,避免其空间格局过于凌乱和破碎。模型运行结果显示,在20%的农田灌溉目标面积下,挠力河流域内83.40%的中度、99.86%的重度、0.71%的正常和100%的严重缺水的农田需进行灌溉管控。研究结果为农田精准化灌溉管理提供思路借鉴,为相关学者研究提供基础。

Based on the coupling characteristics of farmland water utilization and land resource development,this study sought to define the precision irrigation management zones in farmland according agent-based model for optimal land allocation（AgentLA）in Naoli River Basin,and then determined the farmland utilization area with key irrigation control.All the above analysis used the Landsat Satellite images for OLI sensor,the DEM data and the long-term sequenced meteorological data as fundamental data resources.Remote sensing and GIS technology were used to study quantitatively the water profit and loss of farmland,and finally AgentLA model was utilized to delineate the key farmland irrigation area.The results showed that by comparing with the conventional density division method,AgentLA model not only considered the water profit and loss of farmland,but also took into account the spatial morphological properties,and the key irrigation zones defined by this mode covered the target area suffered high water deficit,had high compactness as well,meanwhile avoided the key irrigation area and its spatial pattern too messy and broken to carry out daily irrigation management.The model running results showed that when the irrigation area of the farmlands was 20%in Naoli River Basin,83.40% of farmlands with moderate water deficit,99.86% of farmlands with severe water deficit,0.71%of normal farmlands and all farmlands with serious water deficit needed to be controlled by irrigation in the future.This study results could be used as references and consultancies for precision irrigation management in the Naoli River Basin,and provide the basis for related scholars.