The Power of Models in Planning: The Case of DaisyGIS and Nitrate Leaching

Spatial deterministic simulation models such as DaisyGIS are increasingly being used for decision‐making in European planning. In Denmark specifically, there is an increasing interest at the regional level to use DaisyGIS as an administrative tool. There are, however, uncertainties associated with the use of these deterministic models, partly due to the spatial variation in input parametres. This study evaluates the use of DaisyGIS for nitrate leaching assessments based on nitrate leaching experiments carried out at the Marbjerg experimental site at Roskilde University. The study includes geostatistical analysis of soil and hydraulic variables and the use of remote sensing for deriving spatial information about the Leaf Area Index. It is found that the model predicts nitrate leaching well when using site‐specific input data but it is quite sensitive to the parameterization of carbon, the C/N ratio and variations in the Leaf Area Index (LAI). With the increasing use of Daisy in the counties, there is a need to find better ways of handling uncertainties in model output which can be used by decision‐makers and to study further the impact of spatial LAI assimilation on catchment scale nitrate leaching processes.     

租购同权”政策对学区房溢价的影响研究——基于空间特征价格模型的广州实证

在公共服务对住房市场的影响研究领域，学校质量的资本化效应一直是重要话题。本文借鉴边界固定效应思路，使用广州市2016和2019年136所重点小学周边学区房与相邻非学区房的配对面板数据，利用空间特征价格模型定量测度了不同质量等级教育资源的资本化效应，使用双重差分模型检验了“租购同权”政策对重点小学学区房房价和租金溢价的影响。研究结果表明：①广州市教育质量已部分资本化于住房价格和租金之中，且教育资源越优质，资本化程度越高。②“租购同权”政策的实施，并未带来学区房房价和租金溢价的显著变化。③“租购同权”政策对不同质量等级的重点小学学区房房价影响存在异质性，政策实施后省级重点小学的学区房溢价上升，区级重点小学的学区房溢价下降。④“租购同权”政策对于不同区域重点小学学区房房价和租金溢价的影响无显著差异。本文的研究结论可以为制定教育资源供给与配置的均衡化和公平性政策提供参考。     

Cellular Automata for Studying Historical Spatial Process of Traditional Settlements Based on Gaussian Mixture Model: A Case Study of Qiaoxiang Village in Southern China

ABSTRACT

The spatial evolution of traditional rural settlements is a natural process that occurs without professional development planning. With rural spatial organization now being stimulated by China’s economic structure adjustment, making top-down plans match bottom-up spatial principles is important for the continuity of rural communities. In this research, a Cellular automaton based model was introduced to describe the historical spatial rules of rural settlements based on a traditional village in Southern China. In order to reproduce the rural spatial characteristics and laws that were close to the actual situation truthfully and distinctly, in this model, we refined the growth process into three cyclical steps, and used a Multivariate Gaussian Mixture Model for the evaluation of spatial transition potential. Through historical simulation, evaluation of the current status, and future spatial predictions, results showed that: (1) the growth during the whole spatial process maintained logical consistency for optimal selection; (2) certain houses in the southeast region should be carefully protected as a core living culture exhibit, while the best utilization of other homes should be considered; and (3) the most probable region of growth for tourist services or new housing estates is scattered along the river in the central area of the village.     

旅游目的地品牌基因选择的三力模型构建

旅游目的地竞争已从资源竞争转向品牌竞争。针对当前旅游品牌实践没有价值命题、同质性强等问题，本研究在批判继承现有战略管理、旅游目的地品牌战略等相关理论的基础上，从目的地、客源地、竞争性目的地三个维度，构建了目的地代表力、客源地吸引力、竞争性目的地竞争力的旅游目的地品牌基因筛选的三力（RAC）模型。其中，代表力包括原生性、唯一性、真实性；吸引力包括价值性、自然环境和生活方式差异性、地方依恋性；竞争力包括稀缺性、不可模仿性、难以替代性。旅游目的地品牌基因筛选的三力（RAC）模型将为旅游目的地品牌基因筛选提供完整、详细、具有可操作性且可以广泛应用的定量分析工具，有助于解决当下目的地品牌营销缺乏理论依据问题，能够指导旅游目的地管理机构的品牌建设实践。     

Historic Barrel Vaults Undergoing Differential Settlements

ABSTRACT

A principal reason of damage in historic masonry vaults consists in relative displacements of the vaults’ abutments. Excluding the case of seismic-induced damage, cracks are often produced by differential settlements generated by the lateral wall instability or soil degradation (e.g., due to stress concentrations, non-uniform soil stratigraphy, flooding phenomena etc.). When dealing with historic vaults, the effects of long-term deformation processes cannot often be linked directly to causes, which may also be unknown. In this article, the effects of differential settlements on historic masonry barrel vaults are investigated. An efficient 3D contact-based model was developed to reproduce experiments on a scaled pointed barrel vault (representative of a typology of late-medieval barrel vaults in Scotland) under non-uniform differential settlement. First, the numerical model is used to simulate the experimental campaign, achieving good agreement in terms of crack pattern (longitudinal shear) and transverse-longitudinal deformation profiles. Then, further analyses are carried out to gain insight on the effects of several plausible uniform and non-uniform settlement patterns on representative historic barrel vaults. Various settlement configurations were analysed and complex failure patterns observed. This study could help analysts in understanding the nature of on-going deformation process in historic masonry vaults and engineers in the design of strengthening strategies.     

Integrating Local and Regional in Pre-Contact Hawaiian Agriculture at Kahuku,Hawai‘i Island

ABSTRACT

The agricultural systems of the Hawaiian archipelago were some of the most intensive in the Pacific and this scale of intensity is well illustrated by the large agricultural landscapes of leeward Hawai‘i Island. Previous research in the area has centred on understanding the relationship between agriculture, political process, and large-scale environmental conditions. Much of this research has been oriented at the regional level, privileging discussion of elite management and oversight, with only limited investigation exploring farmer-centric adaptation at local scales. In this paper, we assess the integration of local and regional processes in Hawaiian agriculture using recent paired archaeological and ecological data from the Ka‘ū Field System as a case study. We demonstrate the presence of both general patterns previously identified in the archipelago and particular adaptations to the local environment of Kahuku ahupua‘a. In particular, we highlight targeted infrastructural developments that allowed for cultivation of what would otherwise be a difficult cultivation medium within the confines of a larger, likely regionally organised, field system constrained by general soil biogeochemical thresholds. We argue that such investigations provide an increased understanding on how these large-scale agricultural landscapes were formed by integration at multiple social and spatial scales.     

Fast Nonlinear Analysis of Traditional Chinese Timber-Frame Building with Dou-Gon

ABSTRACT

This article presents a study of the applicability of fast nonlinear analytical (FNA) models in predicting the global response of Chinese traditional timber-frame building with Dou-Gon under seismic excitation. Efforts are made to overcome challenges in establishing simplified calculation models, and the corresponding dynamic equations are derived considering the mechanical behavior of sliding column root, mortise-tenon joint and Dou-Gon (bracket sets). Furthermore, nonlinear time-history analysis is conducted under different seismic excitations. Through a verification study, a good correspondence is obtained with previous shake-table test results. Seismic response analysis is also conducted to investigate the energy dissipation of column root sliding, mortise-tenon joint, and Dou-Gon. Subsequently, peak responses of column root and roof under increased values of peak ground acceleration (PGA) are also analyzed. And then, seismic isolation ability and damping characteristics of the model are discussed.     

Cottages and the Country House: Power,Paternalism and Protest in Elsecar

In the period c.1790 to 1870, the small rural hamlet of Elsecar, near Barnsley, was transformed into an extensive industrial village, with a thriving economy based on iron and coal. Most of this development was instigated, controlled and financed by the local landowners, the 4th and 5th Earls Fitzwilliam. As well as being passionately interested in the practicalities and potential of industrial development, the Earls also looked to the welfare of their workers, providing a wealth of benefits including pensions, sick pay and purpose-built industrial housing. Using a historical approach based on a variety of source material, this paper explores the Earls’ provision of workers’ housing as a way in which to consider wider themes of power, control, inequality and resistance as they were expressed both in the physicality of the houses themselves, and in the cultural meanings which were attributed to them by contemporary observers. The paper argues that workers’ housing functioned as a visible embodiment of power relationships within Elsecar and, because of this, it continues to have a significant resonance in the modern world.     

日常消费空间中的情绪产生与作用机制——基于南京的实证研究

本研究引入消费者行为学的"认知-情绪-行为"模型，并加入空间要素建立整体框架，采用结构方程模型与质性研究相结合的方法，探讨消费空间中影响消费者情绪产生的因素以及情绪对居民生活满意度的作用。研究表明，积极情绪的产生主要受到个人价值观的鲜明度、消费场所物质环境的宜人度和消费场所中社会交往的深度影响；消极情绪的产生主要受到个体经济地位和个人价值观的鲜明度影响；积极情绪与消极情绪均显著影响消费者的生活满意度，积极情绪会导致较高生活满意度的产生。本研究从情绪的角度阐释消费空间和人的关系，是从微观尺度上对情绪地理学研究的新探索，同时也为城市消费空间研究与规划提供了人本主义的新视角。