时间： 2022年5月12日（星期四）8:30-10:45

会议号：腾讯会议 159 226 172

主办：华中农业大学

承办：资源与环境学院

报告人1：舒华 8:30-9:15    

题目：地理流的空间异质性量化及其模式挖掘

The spatial heterogeneity quantification and spatial pattern mining of geographical flows

摘要：地理系统的各部分之间、构成要素之间都存在着显式或隐式的联系，这些联系表现为各种形式的地理流（简称流），如交通流、物流、信息流等。因此，针对地理流的研究对于理解地理现象的格局及其成因具有重要的意义。流可以抽象为包含起点和终点的概念模型，因而构成一个特殊的四维对象。因此，将流作为整体对象进行研究时，就必须突破传统的欧氏空间的框架，构建新的空间的模型。为此，我们从流的本质特征入手，定义了地理信息科学视角的流空间模型及其中的测度。以此为基础，我们从流的空间异质性解析这一基本问题出发，解决了流空间异质性定量刻画及其统计显著的异质性模式提取的问题。针对流的空间异质性，我们从点的空间异质性入手，提出了点和流的空间异质性定量刻画方法。针对空间聚集这种流空间异质性最常见的表现形式，我们提出了流的L函数方法，实现了流空间聚集尺度的准确估计，为流的空间异质性解析和模式提取提供了重要特征参数。对于多元流的异质性，我们以二元流为例，提出了二元流交叉聚集尺度估计的流的交叉L函数方法，为二元流异质性解析和模式提取提供了可靠方法。二元流的聚集模式中，聚集程度较高的流形成二元流丛集模式。为了挖掘二元流的丛集模式，我们将密度聚类思想和流的空间统计方法相结合，提出了二元流的密度聚类方法。未来，我们将继续以流空间理论为基础，完善流空间的表达与度量体系，改进流的可视化，挖掘流的复合模式，时空模式及多元流模式。结合多源城市大数据，从不同尺度揭示人流活动的异质性及其影响因素，为破解城市交通、区域人口流动的规律提供分析方法。

Explicit or implicit connections exist among different parts or components of a geographical system. These connections are represented as geographical flows (flows for short), such as transportation flows, commodity flows and information flows, etc. Therefore, researches about geographical flows are of great importance for understanding the patterns and causes of geographical phenomenon. A flow can be abstracted as a conceptual model comprising an origin and a destination. Thus, a flow is a special 4-D objects. Therefore, when taking flows as indivisible objects in geographical analysis, we must breakthrough the framework of traditional Euclidean space, and build a new space model. To this end, we define a flow space model and some metrics in it from the view of geographical information science, by considering the nature of flows. On these bases, we focus on a fundamental issue, i.e., the spatial heterogeneity analyses of flows, and proposed some methods for quantifying the spatial heterogeneity of flows and mining statistically-significant heterogeneous patterns of flows. For the spatial heterogeneity of flows, we start with the spatial heterogeneity of points and proposed methods for quantifying the spatial heterogeneity of points and flows. For one of most common patterns of flows, i.e., spatial aggregation, we proposed the L-function of flows to accurately estimate the aggregation scale of flows, which is a significant parameter for heterogeneous pattern interpretation and heterogeneous pattern mining of flows. For the spatial heterogeneity of multivariate flows, we take bivariate flows as an example and propose the cross L-function of flows for estimating the cross-aggregation scale of bivariate flows. This offers a reliable method for the heterogeneous pattern interpretation and mining of bivariate flows. A high degree of spatial aggregation comes spatial clustering. To identifying the spatial clustering pattern of bivariate flows, we propose a density-based clustering method for bivariate flows by integrating the ideology of DBSCAN (density-based spatial clustering of applications with noise) methods the spatial statistics of flows. In the future, we will continue to perfect the expression and metrics in flow space, improve the visualization of flows, mining the complex pattern, spatiotemporal pattern and multivariate pattern of flows based on the flow spatial theory. Moreover, we will use these methods for multisource urban big data mining and reveal the heterogeneity of human flows and its influence factors, and offer solutions for analyzing the law of urban transportation and human mobility.

报告人2：刘晓磊 9:15-10:00    

题目：矿物-有机质-微生物相互作用体系中铬的氧化还原反应

Redox transformation of chromium in the interactions among minerals, organics, and microbes

摘要：铬污染物的迁移性、生物毒性与其元素价态密切相关，受控于矿物、有机质、微生物等多种环境因素。天然环境中，铬还原过程与含铁矿物密切相关，有机质的参与可使得含铁矿物还原铬的速率及产物发生明显变化。另一方面，表生环境中铬氧化过程与锰氧化物矿物密切相关，而绝大多数锰氧化物的生成均与微生物代谢活动有关。锰氧化物氧化铬的过程可能遭受微生物活动及其代谢产物的影响，与微生物氧化锰的机制紧密关联。因此，探究多环境因子调控下铬的迁移转化规律，对于全面理解铬元素的生物地球化学循环十分关键，可为铬污染防治提供基础资料。

The mobility and toxicity of chromium are controlled by its elemental valence and are affected by various environmental factors such as minerals, organics, and microbes. In natural environments, the reduction of chromium is closely related to the transformation of iron-bearing minerals. However, the presence of organics significantly changed the reduction rate and the form of end-products of chromium by iron-bearing minerals. In addition, the oxidation of chromium is dominantly controlled by manganese oxides in epigenetic environments. Microbial activities are responsible for the majority of manganese oxide formation in nature. Thus, the oxidation of chromium by manganese oxides may be affected by microbes, which is linked to their manganese oxidation mechanisms. Therefore, exploring the migration and transformation of chromium under the regulation of multiple environmental factors is crucial to understanding the biogeochemical cycles of chromium comprehensively and has significant implications for chromium remediation in contaminated environments.

报告人3： 陈婷 10:00-10:45  

题目：高效铜基多相类芬顿催化体系的开发及其对水中新兴污染物的控制及界面机制研究

Development of efficient copper-based heterogeneous Fenton-like catalysis for emerging pollutants degradation and interfacial mechanism studies

摘要：近年来，新兴污染物在地表水环境中被频繁检出，由于其“三致”效应等毒性，对生态系统和人类健康构成严重威胁，然而传统水处理技术无法将其有效去除。类芬顿催化水处理技术可无选择性氧化有机物，是目前处理水相中难降解有机污染物、实现高效水净化的重要方法之一。在众多催化处理体系中，铜基类芬顿水处理技术由于具有较宽的pH适用范围及较快的氧化还原速率，成为近年来环境科学工作者关注的重点之一。然而，如何提高该体系实际处理效能、控制金属离子的溶出及探明相关的作用机制仍是该领域亟待深入研究的重要问题。基于此，针对新兴污染物的地表水污染及难以有效去除等问题，我们开发了高效的铜基类芬顿催化水处理体系，通过构建多金属协同作用体系、制造表面缺陷和构筑含铜共价键作为电子转移通道等方式，加速了水处理界面电子转移速率，有效提高了该体系处理典型新兴污染物的效能。并针对所开发的体系在污染物降解动力学、降解途径、活性物种鉴定、水处理界面作用机制、环境应用潜能等方面展开了详细的研究。该研究有效解决了铜基类芬顿水处理技术面临的金属离子易溶出、pH适用范围窄等问题，所取得的研究结果可拓展该体系在水环境治理中的应用，为发展新兴污染物的非均相催化水处理技术提供新的理论和技术支持。

In recent years, emerging pollutants (ECs) have been frequently detected in water environment. Due to the "three-effect" toxicity, ECs pose a serious threat to the ecosystems and human health. However, traditional water treatment technologies cannot effectively degrade ECs. Fenton-like catalysis can oxidize organic pollutants non-selectively and is one of the important methods to degrade refractory organic pollutants in water. Among them, copper-based Fenton-like catalysis has been studied in recent years due to its wide pH applicable range and fast redox rate. However, how to improve the actual treatment efficiency, control the dissolution of metal ions, and explore the related mechanism are still important issues that need to be further studied. Hence, this research developed series of efficient copper-based Fenton-like catalytic systems, which were used to improve the removal efficiency of ECs in water. The interfacial electron transfer rate was accelerated by constructing multi-metal synergistic system, fabricating surface defects, and constructing copper-containing covalent bonds as electron transfer channels. The kinetics of ECs degradation, degradation pathway, identification of active species, intrinsic mechanism, and environmental application potential of the developed systems were detailly studied. This research effectively solves the problems of dissolution of metal ions and narrow pH applicable range in copper-based Fenton-like catalysis, which provides a new theoretical and technical support for the development of heterogeneous catalysis in water treatment towards ECs.