地下水水源地的供水安全对保障居民安全用水和保护地下水具有重要意义, 合理地划分地下水水源地保护 区, 对水源充分利用和水质保护有着重要作用。以甘河子地下水水源地为计算背景, 采用数值模拟的方式建立水源 地地下水流模型, 基于 Mo rris 方法, 对渗透系数和有效孔隙度对粒子追踪迹线长度的影响进行局部和全局灵敏度 分析。利用 Ar cMap, 分别对根据局部、全局灵敏度计算出的粒子追踪迹线长度进行一级、二级地下水源地保护区 初步划分, 作为日后根据当地实际情况进行多方协调、最终确认保护区范围的基础, 并分析不同分析方法、不同影响 因子对保护区面积的模拟结果的影响。结果显示, 全局灵敏度与局部灵敏度并非简单线性关系, 并且相同条件下, 有效孔隙度对于粒子追踪迹线长度和地下水源地保护区范围的影响程度均大于渗透系数。根据局部、全局灵敏度 划分的一级、二级地下水源地保护区面积大小关系均为: 局部灵敏度( 参数为渗透系数) > 全局灵敏度> 局部灵敏度 ( 参数为有效孔隙度) 。

The wat er supply safety g roundw ater source a rea is of g reat significance fo r ensuring r esidentc s safe w ater use and pr otecting gr oundw at er. Rational div isio n o f gr oundwater so urce a rea pr otectio n zone plays an im po rtant ro le in making full use of w ater so ur ce and water quality pr otectio n. Taking the g ro undw ater so urce of Ganhezi as the calculatio n backgr ound, the gr oundwat er flow mo del of the wat er source area w as established by numerical simulatio n. Based on Mo rris method, the influ2 ence o f permeabilit y coefficient and effective por osity on particle t racking tr ace leng th w ere analy zed lo ca lly and g lobally . Using Ar cMap, the primar y and tw o2level gr oundwater source protected areas wer e div ided for particle tr acking t race lengths and calculated acco rding to lo ca l and g lo ba l sensitiv ity . T his w as the basis for multiparty coo rdinat ion and final recog nition of the scope of protected a reas accor ding to the local actual situation in the futur e. The influence of differ ent methods and differ ent influence facto rs on the simulation results of the area o f the pro tected ar ea wer e also analyzed. T he results show ed that the relat ionship betw een global sensitiv ity and lo cal sensitiv ity w as not a simple linear r elatio nship, w hile under the same conditio ns, the effect of effective po ro sity o n particle tr acking trace length and pro tect ion area was g reater than t hat o f permeability co efficient . Acco rd2 ing to the local and global sensitivit y, the area size relat ionship of primar y and t wo g roundw ater source pr otected areas w ere: Lo2 cal sensitiv ity ( parameter was permeability coefficient) > Global sensitivity> Local sensitivity ( parameter w as effective poro sity) .

国家自然科学基金( 41572210) ; 河海大学大学生创新训练项目( 2018102941026)