南京紫金山绿道驻点分布及其游人游赏行为特征研究

伴随环境公平性需求的提升和数字化技术的进步,中国景观建设正逐步完成公共化的转变,其间景观数字化的手段得到广泛运用。以往研究多集中于测绘、数字映射和历史景观保护等客观领域的问题,而对景观中使用主体的关注较少。以南京市紫金山绿道为例,采用热力图,分析游客集聚和停留特征,确定紫金山绿道驻点具体分布;以驻点周边POI数据和调查问卷为基础,借助核密度分析和问卷分析,探寻紫金山绿道驻点形成原因,总结驻点的游客游憩动机和游赏行为特征。结果表明:(1)紫金山绿道存在21个驻点,驻点的空间分布相对均衡;节假日驻点规模增加,且向北偏移。(2)驻点周围往往风景名胜资源丰富,公共服务设施条件好,且建筑密集、交通便利、地形平缓,因此,景观、公共设施、建筑、交通、地形可以影响游客的游憩行为。(3)紫金山绿道游客以本地居民为主,被绿道相融于自然山体的生态环境所吸引;主要游赏行为包括赏景、拍照、休憩、交流。游赏行为特征因性别、年龄、游憩频率的不同表现出一定的差异性。提出紫金山绿道的建设和维护应回应各类游客的个性需求,最大程度创造游客安全舒适的游憩体验。最后,阐述景观数字化研究手段对于关注景观使用者具有重要作用,可借助数字化技术的科学性和精准性,整合全要素进行系统化的分析,以进一步促进景观综合质量的提升。

Numerical study of homogeneous–heterogeneous reactions on stagnation point flow of ferrofluid with non-linear slip condition

This study deals with the stagnation point flow of ferrofluid over a flat plate with non-linear slip boundary condition in the presence of homogeneous-heterogeneous reactions.Three kinds of ferroparticles,namely,magnetite(Fe_3O_4),cobalt ferrite(CoFe_2O_4) and manganese zinc ferrite(Mn-ZnFe_2O_4) are taken into account with water and kerosene as conventional base fluids.The developed model of homogeneous-heterogeneous reactions in boundary layer flow with equal and unequal diffusivities for reactant and autocatalysis is considered.The governing partial differential equations are converted into system of non-linear ordinary differential equations by mean of similarity transformations.These ordinary differential equations are integrated numerically using shooting method.The effects of pertinent parameters on velocity and concentration profiles are presented graphically and discussed.We found that in the presence of Fe_3O_4-kerosene and CoFe_2O_4-kerosene,velocity profiles increase for large values of α and β whereas there is a decrement in concentration profiles with increasing values of if and K_s.Furthermore,the comparison between non-magnetic(A1_2O_3) and magnetic Fe_3O_4 nanoparticles is given in tabular form.