长三角地区民宿的空间分布及影响因素   总被引：5，自引：0，他引：5  

龙飞  刘家明  朱鹤  李涛 《地理研究》2019,38(4):950-960

近年来,民宿作为旅游业发展的新兴模式,日益受到关注,并呈现蓬勃发展状态。以民宿业发展最为成熟的长三角地区为研究对象,基于去哪儿网相关民宿数据,采用空间最邻近分析、密度分析等空间分析方法,研究民宿的空间分布格局与特征,并基于逐步回归分析,探讨影响民宿分布的因素,得出以下结论：① 长三角地区民宿呈现高度集聚的状态,整体上表现为多核心分布,并形成一、二、三级组团,密度由核心向外围递减。② 民宿集聚分布在经济较为发达的城市和核心景区周边,具有明显的中心性。③ 基于对经济基本状况、交通状况、人口条件、居民消费能力、旅游市场状况、旅游资源与环境条件等方面共15个影响因素分析,发现单位面积旅游收入、A级景区数量、人口密度、地区国内生产总值四个指标对民宿密度有显著正向影响,其中,影响力单位面积旅游收入>A级景区数量>人口密度>地区国内生产总值。  相似文献   

产业集聚与城镇空间格局的耦合关系及时空演化——以长三角区域为例   总被引：2，自引：1，他引：2  

曹炳汝  孙巧 《地理研究》2019,38(12):3055-3070

产业集聚与城镇空间格局的变动之间存在着密切的联系。针对两者之间的耦合关系及时空演化问题,构建区域产业集聚与城镇空间格局演化综合评价指标,并利用1990—2016年长三角区域16个城市的统计数据,基于面板回归模型和空间重心模型探究两系统之间演化的互动作用关系和时空演化。结果表明：长三角区域的产业集聚与城镇空间格局间存在较显著的耦合关系;长三角区域各市区的耦合协调度及空间匹配度均稳步提升,但长三角区域耦合协调发展程度不够均衡,长三角南部的耦合协调的发展程度稍弱于长三角区域北部的发展;在近几十年的发展中,长三角北部地区逐渐形成以上海-南京为轴线的耦合协调发展区域,整个长三角区域的耦合协调则呈现“Z”字形特征。  相似文献   

Flood hazard and risk analysis in the southwest region of Bangladesh     

Tawatchai Tingsanchali  Mohammed Fazlul Karim 《水文研究》2005,19(10):2055-2069

Flood hazard and risk assessment was conducted to identify the priority areas in the southwest region of Bangladesh for flood mitigation. Simulation of flood flow through the Gorai and Arial Khan river system and its floodplains was done by using a hydrodynamic model. After model calibration and verification, the model was used to simulate the flood flow of 100‐year return period for a duration of four months. The maximum flooding depths at different locations in the rivers and floodplains were determined. The process in determining long flooding durations at every grid point in the hydrodynamic model is laborious and time‐consuming. Therefore the flood durations were determined by using satellite images of the observed flood in 1988, which has a return period close to 100 years. Flood hazard assessment was done considering flooding depth and duration. By dividing the study area into smaller land units for hazard assessment, the hazard index and the hazard factor for each land unit for depth and duration of flooding were determined. From the hazard factors of the land units, a flood hazard map, which indicates the locations of different categories of hazard zones, was developed. It was found that 54% of the study area was in the medium hazard zone, 26% in the higher hazard zone and 20% in the lower hazard zone. Due to lack of sufficient flood damage data, flood damage vulnerability is simply considered proportional to population density. The flood risk factor of each land unit was determined as the product of the flood hazard factor and the vulnerability factor. Knowing the flood risk factors for the land units, a flood risk map was developed based on the risk factors. These maps are very useful for the inhabitants and floodplain management authorities to minimize flood damage and loss of human lives. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

乌兰布和沙漠东南缘湖泊群消涨与驱动因素     

王理想  蔡明玉  白雪莲  乔荣荣  季树新  常学礼 《中国沙漠》2020,40(2):59-67

湖泊是对环境变化响应敏感的地理单元,湖泊消长与响应机制研究对维持区域生态系统稳定具有重要意义。基于1999—2018年Landsat、气象、水文和农业种植面积等多种数据,在ArcGIS平台中利用改进归一化差异水体指数(MNDWI)及目视修正方法提取了乌兰布和沙漠东南缘湖泊群空间信息,运用统计学方法对主要驱动因子与湖泊消涨的关系进行了分析。结果表明:1999—2018年乌兰布和沙漠东南缘大湖泊(面积大于100 hm²)在面积上占优势,小湖泊(面积小于100 hm²)在数量占优势。趋势分析表明大湖泊面积和数量呈显著性减少趋势(相关系数分别为R=0.624 > R_18,0.01=0.561和R=0.648 > R_18,0.01=0.561);小湖泊减少趋势不显著。在空间分布格局上,研究区中部是大湖泊稳定分布区,大湖泊数量11~23个,面积2 208~4 581 hm²。研究区湖泊消长主要受到年实际引黄水量、农田面积和地下水埋深的影响。其中,实际引黄(河)水量影响所有湖泊(P≤0.01),而农田面积和地下水埋深分别对大湖泊(P≤0.01)和小湖泊(P≤0.05)影响显著。用这3个因子分别构建的多元回归模型显示,在大、小湖泊面积和数量预测方面,精度分别达到75.7%和60.5%以上。  相似文献   

Spatiotemporal variations of suspended sediment transport in the upstream and midstream of the Yarlung Tsangpo River (the upper Brahmaputra), China   总被引：4，自引：0，他引：4       下载免费PDF全文

Xiaonan Shi  Fan Zhang  Xixi Lu  Zhaoyin Wang  Tongliang Gong  Guanxing Wang  Hongbo Zhang 《地球表面变化过程与地形》2018,43(2):432-443

The Yarlung Tsangpo River, which flows from west to east across the southern part of the Tibetan Plateau, is the longest river on the plateau and an important center for human habitation in Tibet. Suspended sediment in the river can be used as an important proxy for evaluating regional soil erosion and ecological and environmental conditions. However, sediment transport in the river is rarely reported due to data scarcity. Results from this study based on a daily dataset of 3 years from four main stream gauging stations confirmed the existence of great spatiotemporal variability in suspended sediment transport in the Yarlung Tsangpo River, under interactions of monsoon climate and topographical variability. Temporally, sediment transport or deposition mainly occurred during the summer months from July to September, accounting for 79% to 93% of annual gross sediment load. This coincided with the rainy season from June to August that accounted for 51% to 80% of annual gross precipitation and the flood period from July to September that accounted for approximately 60% of annual gross discharge. The highest specific sediment yield of 177.6 t/km²/yr occurred in the upper midstream with the highest erosion intensity. The lower midstream was dominated by deposition, trapping approximately 40% of total sediment input from its upstream area. Sediment load transported to the midstream terminus was 10.43 Mt/yr with a basin average specific sediment yield of 54 t/km²/yr. Comparison with other plateau‐originated rivers like the upper Yellow River, the upper Yangtze River, the upper Indus River, and the Mekong River indicated that sediment contribution from the studied area was very low. The results provided fundamental information for future studies on soil and water conservation and for the river basin management. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

黄河中下游沿线城市水资源利用效率的时空演变及影响因素   总被引：2，自引：1，他引：2  

巩灿娟  徐成龙  张晓青 《地理科学》2020,40(11):1930-1939

采用超效率DEA模型、GIS空间分析方法、动态面板的系统GMM估计方法对2010—2017年黄河中下游沿线城市水资源利用效率时空格局及影响因素进行分析，结果表明：① 黄河中下游沿线城市水资源利用效率整体由2010年的0.70波动下降为2017年的0.67，且区域内70%以上的城市水资源利用效率变动趋势与其一致；② 黄河中下游沿线城市水资源利用效率呈“U”型区域两侧相对较高，中间区域相对较低的空间分布态势，且空间分布重心始终位于地理重心的北方；③ 环境规制、经济发展水平、产业结构优化、技术水平对水资源利用效率呈显著正向影响，农田水利设施建设、城镇化对水资源利用效率呈显著负向影响。研究结论可为黄河流域生态保护与高质量发展的推进提供决策支持。  相似文献   

Shift trend and step changes for runoff time series in the Shiyang River basin,northwest China     

Z. L. Li  Z. X. Xu  J. Y. Li  Z. J. Li 《水文研究》2008,22(23):4639-4646

Shift trend and step changes were detected for runoff time series in the Shiyang River basin, one of the inland river basins in north‐west China. Annual runoff data from eight tributaries as well as both annual and monthly runoff from the mainstream from 1958 to 2003 were used. Seven statistical test methods were employed to identify the shift trends and step changes in the study. Mann–Kendall test, Spearman's Rho test, linear regression and Hurst exponent were used to detect past and future shift trends for runoff time series, while the distributed‐free CUSUM test, cumulative deviations and the Worsley likelihood ratio test were used to detect step changes for the same time series. Results showed that the annual runoff from Zamu, Huangyang and Gulang rivers, as well as both annual and monthly runoff from the mainstream, show statistically significant decreasing trends. Future tendency of runoff for both tributaries and mainstream were consistent with that from 1958 to 2003. Step changes probably occurred in 1961 for the runoff from Huangyang, Gulang and Dajing rivers according to the Worsley likelihood ratio test, but no similar results were found using the other two test methods. Three change points (1979, 1974 and 1973) were detected for the mainstream using different methods. These change points were close to the years that reservoirs started to be operated. Both climate change and human activities, especially the latter, contributed to the decreasing runoff in the study area. Between 21% and 79% of the reduction in runoff from the mainstream was due to the impact of human activities during the past few decades. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

黄河三角洲北部贝壳堤岛的近期演变   总被引：2，自引：0，他引：2  

杜廷芹  黄海军  王珍岩  刘艳霞 《海洋地质与第四纪地质》2009,(3)

通过不同年代地形图、卫星影像的对比及野外实地测量等,综合分析了黄河三角洲北部开敞型和潮沟型两类贝壳堤岛近50年来的数量和面积变化及其演化特征。结果表明,该区两类贝壳堤岛自20世纪50年代以来在自然和人为因素的共同作用下发生了明显的变化,但其演化特征因岛屿成因的类型差异而各不相同。目前,该区贝壳堤岛群逐渐萎缩,人类活动已成为影响三角洲北部两类贝壳堤岛发育演变的主导因素,特别是潮沟型贝壳堤岛,基本上结束了自然演化的历史,呈现出新的演化特征。  相似文献   

末次盛冰期长江南京段古河槽特征   总被引：3，自引：0，他引：3  

曹光杰  李彦彦 《海洋地质与第四纪地质》2009,(3)

根据南京长江大桥、三桥、四桥的地质钻孔资料,绘制南京段长江古河槽地质剖面示意图,对拟建南京长江四桥附近的4个钻孔进行了采样分析,从钻孔沉积物样品的14C年代及阶地形成时间可以判断,南京段约-60~-90 m的深槽为末次盛冰期时的长江河槽,钻孔揭示,南京段长江古河槽狭窄陡峭,呈V型,在南京长江大桥附近形成局部深切。  相似文献   

Distribution and sources of organochlorine pesticides in water and sediments from Daliao River estuary of Liaodong Bay,Bohai Sea (China)   总被引：1，自引：0，他引：1  

Li Tan  Mengchang HeBin Men  Chunye Lin 《Estuarine, Coastal and Shelf Science》2009

The levels of 19 kinds of organochlorine pesticides (OCPs) in the aqueous phase, suspended particulate matter (SPM), pore water and sediments from Daliao River estuary of Liaodong Bay (Bohai Sea) in northeast China were investigated to evaluate their potential pollution risks. The total OCPs concentrations in the aqueous phase, SPM, pore water and sediments were 3.7–30.1 ng l⁻¹, 4.6–52.6 ng l⁻¹, 157–830 ng l⁻¹ and 2.1–21.3 ng g⁻¹ dry weight, respectively. The concentrations of OCPs, in the Daliao River estuary, are in the mid-range, as compared to those reported in other estuaries worldwide. The distribution of HCHs and DDTs were different indicating different contamination sources. Lindane is the main type of HCH and continuing use in northeast China of ‘pure’ HCH (lindane) rather than technical HCH accounts for the source. The ratios of (DDE + DDD)/DDT in the samples indicate no recent inputs of these chemicals to the estuary.  相似文献