CAJ | 학술논문

泾河流域是农业旱灾的多发地区,但是对该地农业旱灾的发生规律、旱灾影响及旱灾恢复和准备措施方面开展的研究还较少.本文根据自然灾害风险评估的理论框架,建立了1km栅格精度的泾河流域农业旱灾风险空间评估模型,并对农业旱灾致灾因子危险性及农业承险体脆弱性进行评估,最后综合评估该地区农业旱灾风险.在此基础上,分析研究区农业旱灾危险性、承险体脆弱性及风险的空间特征.本研究采用z指数方法评估泾河流域农业旱灾致灾因子的强度,选取农作物生长季缺水率、土壤有效含水量、有效灌溉面积比以及坡度等4个指标评估研究区1km空间尺度的农业旱灾脆弱性.农业旱灾风险综合评估的结果表明,泾河流域农业旱灾风险的高风险区位于该地区北部,低风险区位于该地区南部,且不同等级风险区呈现出自东向西、自南向北逐渐降低的总体趋势,但不同等级风险区呈现间隔分布的趋势.
경하류역시농업한재적다발지구,단시대해지농업한재적발생규률、한재영향급한재회복화준비조시방면개전적연구환교소.본문근거자연재해풍험평고적이론광가,건립료1km책격정도적경하류역농업한재풍험공간평고모형,병대농업한재치재인자위험성급농업승험체취약성진행평고,최후종합평고해지구농업한재풍험.재차기출상,분석연구구농업한재위험성、승험체취약성급풍험적공간특정.본연구채용z지수방법평고경하류역농업한재치재인자적강도,선취농작물생장계결수솔、토양유효함수량、유효관개면적비이급파도등4개지표평고연구구1km공간척도적농업한재취약성.농업한재풍험종합평고적결과표명,경하류역농업한재풍험적고풍험구위우해지구북부,저풍험구위우해지구남부,차불동등급풍험구정현출자동향서、자남향북축점강저적총체추세,단불동등급풍험구정현간격분포적추세.
Though drought is a recurrent phenomenon in the Jinghe watershed,very little attention has been paid to drought mitigation and preparedness.This article presents a method for the spatial assessment of agricultural drought risk in the Jinghe watershed of western China at a 1-km grid scale.A conceptual framework,which emphasizes the combined roles of hazard and vulnerability in defining risk,is used.The Z index method in a GIS environment is used to map the spatial extent of drought hazards.The key social and physical factors that define agricultural drought in the context of the Jinghe watershed are indentified and corresponding thematic maps are prepared.Risk is calculated by the integration of hazard and vulnerability.Results show that the risk gradient follows a north-south and west-east tendency and that agricultural droughts pose the highest risk to northern and northwestern sections of the Jinghe watershed.