Mountain Effect and Differences in Storm Floods between Northern and Southern Sources of the Songhua River Basin

In this study, the differences in annual rainstorm changes in the Second Songhua River Basin and the Nenjiang River basin and their causes were compared from the perspective of mountain effects. The following results were drawn: (1) Altitude effect is the primary factor leading to increased rainstorms in the southern source; (2) Slope effect primarily leads to differences of the weather systems in the two sources, and thus cause the difference of the rainstorms; (3) Slope effect is responsible for the greater fluctuation in the observed floods in the southern source. These landform differences eventually lead to the differences in the characteristics of floods in the southern and northern sources. Commensurability method was used to identify the period of rainstorms in the southern and northern sources. The results showed that although rainstorms do not appear at the same time in the two sources they are characteristic of a 10 years' period in both areas. These results can serve as hydrological references for flood control and long-term flood disaster predictions.

Effect of Agricultural Comprehensive Development on Increasing Income of Farmers in Jiangsu Hilly and Mountainous Areas

To adapt to rural and agricultural economic development,Jiangsu Province adjusted main task of comprehensive development of hilly and mountainous areas to supporting and promoting agricultural structural adjustment of hilly and mountainous areas and promoting increase of agricultural benefits and farmers' income. Through typical survey,this paper made an objective evaluation of effect of agricultural comprehensive development of hilly and mountainous areas in Jiangsu Province from increasing farmers' income. Results indicated that agricultural comprehensive development investment projects in Jiangsu hilly and mountainous areas are closely coupled with local agricultural production structure; financial funds promote social capital input to construction of economic forest,fruit and grass planting,and livestock raising. Through demonstration and guidance of farmers,it promoted adjustment of agricultural production structure and increased farmers' income. Finally,it came up with pertinent policy recommendations.

秦岭山脉南北麓暴雨触发条件对比分析

采用实况气象观测资料、FY-2G卫星云图资料、多普勒雷达资料和ERA50.25°×0.25°逐小时再分析资料,对2021年8月21-22日同时发生在秦岭南北麓的强等级暴雨过程进行对比分析,探讨秦岭南北麓暴雨触发条件的影响机制。结果表明:秦岭北麓流场上,西风带系统在秦岭特殊地形作用下,对流层低层形成中尺度气旋性环流,通过热力作用触发暴雨,对流性降水持续时间短,强度小;湿斜压性增强是秦岭北麓暴雨开始的一个信号,当湿斜压性减弱以及中层比湿减小时,降水结束。对秦岭南麓而言,地形作用下对流层低层流场形成中尺度辐合线触发暴雨;降水释放的凝结潜热加热低层大气,与中低层入侵的冷空气共同构建对流不稳定结构,上升运动增强,降水增强和持续;对流云团在高温高湿的环境下迅速组织化合并发展,形成中尺度对流复合体(MCC),对流强度大,对流层结深厚,小时雨强大;中低层冷空气的入侵和扩散到地面的时间分别与秦岭南麓强降水的开始和结束时间对应。

A discussion on Corioli force effect and aftershock activity tendency of the M=8.1 Kunlun Mountain Pass earthquake on Nov. 14, 2001

Following the theory and definition of the Corioli force in physics, the Corioli force at the site of the M=8.1 Kunlun Mountain Pass earthquake on November 14, 2001, is examined in this paper on the basis of a statistical research on relationship between the Corioli force effect and the maximum aftershock magnitude of 20 earthquakes with M7.5 in Chinese mainland, and then the variation tendency of aftershock activity of the M=8.1 earthquake is discussed. The result shows: a) Analyzing the Corioli force effect is an effective method to predict maximum aftershock magnitude of large earthquakes in Chinese mainland. For the sinistral slip fault and the reverse fault with its hanging wall moving toward the right side of the cross-focus meridian plane, their Corioli force pulls the two fault walls apart, decreasing frictional resistance on fault plane during the fault movement and releasing elastic energy of the mainshock fully, so the maximum magnitude of aftershocks would be low. For the dextral slip fault, its Corioli force presses the two walls against each other and increases the frictional resistance on fault plane, prohibiting energy release of the mainshock, so the maximum magnitude of aftershocks would be high. b) The fault of the M=8.1 Kunlun Mountain earthquake on Nov. 14, 2001 is essentially a sinistral strike-slip fault, and the Corioli force pulled the two fault walls apart. Magnitude of the induced stress is about 0.06 MPa. After a comparison analysis, we suggest that the aftershock activity level will not be high in the late period of this earthquake sequence, and the maximum magnitude of the whole aftershocks sequence is estimated to be about 6.0.

Diurnal Variations of Summer Precipitation in the Beijing Area and the Possible Effect of Topography and Urbanization

The present study examined the diurnal variations of summer precipitation in the Beijing area by usingsubdaily precipitation and wind observations. A combined effect of topography and urbanization on thecharacteristics of diurnal variations was suggested. It was shown that stations located in the plain areaexhibited typical night rain peaks, whereas those in the mountainous area exhibited clear afternoon peaks ofprecipitation diurnal variations. The precipitation peaks were associated with wind fields around the Beijingarea, which were found to be highly modulated by mountain-valley circulation and urban-country circulation.The lower-tropospheric wind exhibited a clear diurnal shift in its direction from north at 0800 LST to southat 2000 LST, which reflected mountain-valley circulation. The transitions from valley to mountain windand the opposite generally happened after sunset and sunrise, respectively, and both occurred earlier for thestations located closer to mountains. By comparing the diurnal variations of precipitation at stations in anortheast suburb, an urban area, and a southwest suburb, it was revealed that the northeast suburb grouphad the highest normalized rainfall frequency, but the southwest group had the lowest from late afternoon tolate evening. On the contrary, in the early morning from about 0200 to 1000 LST, the southwest group andurban group had the highest normalized rainfall frequency. This pattern might originate from the combinedeffects of mountain-valley topography and urbanization.

Impact of land expropriation on farmers’ livelihoods in the mountainous and hilly regions of Sichuan, China

Research on the sustainable livelihoods of rural households is of great significance to mitigating rural poverty and reasonable land expropriation policy helps to realize better livelihoods and sustainable development.Scholars have conducted considerable research on the relationships between land expropriation and farmers'livelihoods.However,few quantitative studies have used the characteristics of villages as control variables to systematically analyze the impact of land expropriation on farmers'livelihood capital and strategy in the mountainous and hilly regions of China.This study uses the Partial Least Squares-Structural Equation Model(PLS-SEM)to systematically explain the impact of land expropriation on farmers'livelihoods in mountainous and hilly regions of Sichuan in 2013,with the characteristics of the village including income,accessibility and terrain as control variables.The analysis uses both representative sample data of 240 rural households and spatial data calculated using a 30 m Digital Elevation Model(DEM)by Geographic Information System(GIS).Results are as follows:(1)The land expropriation characteristicsare negatively affected by village accessibility.Villages with worse accessibility tend to have fewer land parcels and less land area expropriated.Additionally,land that is expropriated from inaccessible villages tends to receive less compensation.(2)Natural capital is negatively affected by number and area of land expropriation.Natural capital is not only directly affected by village accessibility,but also indirectly affected by village accessibility through the mediating effect of the number and area of land parcels expropriated.(3)Physical capital is positively affected by compensation for land expropriation,and negatively affected by village accessibility through compensation for land expropriation.The worse a village's accessibility/location is,the less compensation it will receive for land expropriation,resulting in lower physical capital.(4)Financial capital is negatively affected by village accessibility indirectly through compensation for land expropriation.The better the village'saccessibility is,the greateris its compensation for land expropriation and,hence,the greater is its financial capital.(5)Social capital is directly and negatively affected by the number and area of land parcels expropriated,and is indirectly and positively affected by village accessibility through the number and area of land parcels expropriated.This study enhances our understanding of the characteristics of land expropriation and rural households'livelihood as well as the impact of land expropriation on rural households'livelihood.These findings provide reference for the formulation of proper policies related to land expropriation and the improvement of rural households'livelihoods in the mountainous and hilly regions of China.

心理学视野下的累积文化演化:理论发展与解释流派整合

累积文化演化是文化演化的一个重要子集,侧重关注文化的逐渐累积,指的是文化在传递和修改的过程中,在复杂性、效率性等方面发生了适应性的变化。虽然累积文化演化是一个跨学科概念,但却有着浓厚的心理学底色。心理因素尤其是认知因素在其概念框架和解释流派的发展过程中占据着重要地位,对认知的重视推动了累积文化演化的理论发展和解释流派的整合。未来研究可以从理论发展角度进一步明晰累积文化演化的衡量标准,从解释流派整合角度探明累积文化演化的过程与细节,以及从心理学角度更深入考察心理因素对累积文化演化的影响。

An analysis of oasis stability in arid areas:a case study in the northern slope areas of the Tianshan Mountains

This paper discusses oasis stability at regional scale with a case study in the northern slope areas of the Tianshan Mountains (NSTM). The results showed certain significant aspects. (1) As long as water resources in the oasis keep stable and their utilization efficiency can be maintained or gradually increased, the primary productivity could be continuously increased and the natural primary productivity keeped relatively stable. In this case, it is considered that the oasis is stable and its sustainable development can be achieved at regional scale. (2) Considering the availability of water resources in the oases, the oases on the alluvial-diluvial fans are highly stable. In the alluvial plain downstream of the groundwater overflowing zones the oases are moderately stable and in the lacustrine deltas or dry lacustrine deltas the oases are lowly stable. (3) Enlargement of oases and the increase of water resources and vegetation coverage in the oasis will certainly enhance the 'cold-island effect' of the oasis and increase the stability of oases.

山区铁路隧道工程资源环境影响效应评估研究

山区地质复杂、环境敏感、生态脆弱,致使铁路隧道建设难度大,且在资源节约、环境保护等方面面临较高要求。绿色设计作为绿色建设的先行环节,对减少隧道建设对资源环境的扰动作用,达到资源节约、环境友好的目的起关键引领作用。为定量评估山区铁路隧道工程的资源环境影响效应、衡量隧道设计的绿色程度,提出一种山区铁路隧道工程资源环境影响效应分析方法。首先,基于“驱动力-状态-响应”模型(Driving force-State-Response,DSR),以隧道设计参数为驱动力指标、资源环境状况为状态指标、隧道设计措施为响应指标,构建山区铁路隧道工程资源环境影响效应评估指标体系,并建立各指标分级标准;其次,运用一种具有自学习自调整能力的支持向量回归模型(Support Vector Regression,SVR)对隧道工程的资源环境影响效应进行评估;再次,以驱动力指标和响应指标为分析对象,运用考虑指标间关联关系及叠加效应的敏感性分析法,甄别对隧道工程资源环境影响效应优化具有重要影响的隧道设计因素;最后,以某山区铁路隧道工程为例,得到该隧道工程的资源环境影响效应值为4.7157,对应等级为较好,表明该隧道工程绿色设计水平较好,资源集约节约利用较合理、环境保护力度较大,可为其他类似工况隧道工程的绿色设计提供借鉴。此外,分析结果显示,注浆加固效果是导致该隧道工程资源环境影响效应变化最敏感的因素,其次为清污分流比例,可着重从这2个方面进行优化设计,以实现隧道工程资源环境影响效应的进一步优化。研究结果验证了本文研究方法的适用性和可操作性,可为山区铁路隧道工程资源环境影响效应评估及明确隧道工程优化设计方向提供科学依据。

Using Urban Landscape Trajectories to Assess Fragmentation in Mountainous Coastal Areas: A Case Study of Shenzhen, China

Rapid urbanization in mountainous coastal areas causes dramatic changes in land use and land cover(LUCC)for their geographic location.To understand changes in landscape trajectories in such regions,we examined temporal and spatial changes in urban landscapes in Shenzhen,China,a city that has undergone rapid urbanization in recent decades,and investigated the drivers of landscape pattern evolution at different scales from LUCC data from 1985,1995,2005,and 2015.The results show that the landscape of Shenzhen has changed dramatically over the 30 years from 1985 to 2015.The proportion of forest area decreased from 50.81%to 37.81%,while the proportion of construction land increased from 17.83%to 48.28%.The changes in the landscape patterns in Shenzhen were driven mainly by human activity.This study is one of the first to assess landscape dynamics of the rapid urbanization from the angle of mountainous coastal area,which plays an important role in the land use and city regulation of the global coastal mountains.

社会资本、知识存量和信息素养对秦巴——武陵山区家庭农场订单生产经营行为的影响

【目的】从社会资本视角,探究影响山区家庭农场订单生产经营行为的因素,为山区家庭农场高质量发展提供经验支持。【方法】基于“刺激—机体—反应”(S-O-R)理论模型,从社会资本、知识存量和信息素养3个维度构建影响家庭农场订单生产经营行为的理论框架,结合秦巴—武陵山区448份家庭农场调查数据,运用AMOS结构方程模型进行实证检验。【结果】社会网络、社会信任和社会规范对家庭农场订单生产经营行为影响极显著(P<0.01,下同),路径标准化系数分别为0.157、0.201和0.109;知识存量在社会网络、社会信任、社会规范与家庭农场参与订单生产经营行为中发挥的间接效应极显著,效应系数分别为0.186、0.116和0.074,说明知识存量在社会网络、社会信任、社会规范与家庭农场参与订单生产经营行为中发挥部分中介作用,其中,知识存量在社会网络与家庭农场参与订单生产经营行为中发挥的中介效应最大,社会信任发挥的中介效应次之;信息素养在社会网络、社会信任与家庭农场参与订单生产经营行为中发挥的间接效应极显著,效应系数分别为0.087和0.113,说明信息素养在社会网络、社会信任与家庭农场参与订单生产经营行为中发挥部分中介作用,且信息素养在社会信任与家庭农场参与订单生产经营行为中发挥的中介效应最大;在社会网络与家庭农场参与订单生产经营行为中,知识存量发挥的中介效应远大于信息素养发挥的中介效应。【建议】以家庭农场社会资本增量提质为抓手,大力培育家庭农场社会资本,规范引导家庭农场订单生产行为;优化政策支持机制,提高订单生产参与率;重视家庭农场知识存量积累和信息素养提升,增强家庭农场订单生产经营能力,旨在引导家庭农场可持续发展。

太行山坡地植物篱种植对土壤水肥的短期影响

为探讨生物措施对人工林坡地土壤环境改善效果,在太行山东麓典型坡地布设枸杞、欧李、连翘、金银花、薄荷5种植物篱,并以平行位置的空白裸地为对照,分析不同植物篱及篱带位置对表层土壤水肥的影响。结果表明:1)与土壤水分相关指标中,不同植物篱带上、带中位置土壤自然含水量较空白对照提高了14.55%~62.69%,土壤总孔隙度基本高于空白对照,且不同植物篱间差异显著(P<0.05),植物篱土壤容重明显降低,且其带上、带中位置土壤黏粒含量较空白对照降低了1.25%~18.56%。2)与土壤肥力相关指标中,不同植物篱土壤有机碳含量较空白对照提高了8.93%~64.00%,土壤碳氮比明显高于空白对照,土壤pH、电导率、全氮含量多低于空白对照,且不同植物篱间差异显著(P<0.05)。3)各植物篱土壤水肥指标之间相关性显著,土壤全氮含量与电导率、自然含水量之间分别呈显著正相关和负相关(P<0.05);土壤有机碳含量与粉粒含量之间呈显著正相关(P<0.05),与总孔隙度、砂粒含量之间呈显著负相关(P<0.05)。4)不同植物篱对土壤水肥影响能力综合得分:金银花(1.970)>薄荷(1.677)>欧李(1.670)>枸杞(1.655)>连翘(1.643)>空白对照(1.527)。5种植物篱短期内均有保持土壤水分和调节土壤肥力能力,其中金银花土壤水肥调节效果最好,可用于修复水土流失较严重的太行山坡地。

烧山火针刺法联合甲氨蝶呤治疗类风湿关节炎活动期的效果及其对患者炎症因子和免疫功能的影响

目的 观察烧山火针刺法联合甲氨蝶呤治疗类风湿关节炎(RA)活动期的效果,并探讨其抗炎和调节免疫作用机制。方法 选取2020年2月至2022年10月郑州市第一人民医院收治的60例RA活动期患者纳入研究,按照随机数表法分为常规组和联合组各30例。常规组患者给予甲氨蝶呤治疗,联合组患者给予烧山火针刺法联合甲氨蝶呤治疗,均治疗两周。于治疗两周后比较两组患者的治疗效果,以及治疗前后的中医证候评分、28个关节疾病活动(DAS28)评分、疼痛(VAS)评分、炎性指标[血沉(ESR)、C反应蛋白(CRP)、肿瘤坏死因子-α (TNF-α)、类风湿因子(RF)、抗环瓜氨酸肽(CCP)抗体]、免疫指标(Treg细胞、Th17细胞、Treg/Th17细胞),同时比较两组患者治疗期间的不良反应发生情况。结果 联合组患者的治疗总有效率为93.33%,明显高于常规组的73.33%,差异有统计学意义(P<0.05);联合组患者治疗两周后的中医证候关节肿胀、冷痛、压痛、晨僵、屈伸不利评分分别为(0.72±0.18)分、(0.70±0.20)分、(0.81±0.22)分、(0.68±0.15)分、(0.77±0.19)分,明显低于常规组的(1.03±0.24)分、(0.96±0.23)分、(1.14±0.26)分、(0.91±0.21)分、(1.09±0.23)分,差异均有统计学意义(P<0.05);联合组患者治疗两周后的DAS28、VAS评分分别为(2.18±0.33)分、(2.46±0.22)分,明显低于常规组的(3.26±0.47)分、(2.89±0.27)分,差异均有统计学意义(P<0.05);联合组患者治疗两周后的ESR、抗CCP抗体、RF、CRP、TNF-α水平分别为(16.23±2.29) mm/h、(172.30±30.14) IU/mL、(130.85±15.42) IU/mL、(10.20±1.68) mg/L、(18.95±4.38) pg/mL,明显低于常规组的(21.84±3.41) mm/h、(205.68±36.77) IU/mL、(157.62±24.10) IU/mL、(13.65±2.06) mg/L、(24.51±6.02) pg/mL,差异均有统计学意义(P<0.05);联合组患者治疗两周的外周血Treg细胞百分比、Treg/Th17比值分别为(2.61±0.35)%、2.44±0.37,明显高于常规组的(2.17±0.28)%、1.68±0.32,Th17细胞百分比为(1.07±0.18)%,明显低于常规组的(1.29±0.22)%,差异均有统计学意义(P<0.05);两组患者治疗期间的不良反应发生率差异无统计学意义(P>0.05)。结论 烧山火针刺法联合甲氨蝶呤治疗RA活动期能明显减轻患者的临床症状,降低炎症反应,调节免疫功能,临床应用疗效显著,且安全性良好。

基于环境DNA技术的黄河流域下游山区河流大型底栖动物群落多样性特征及其影响要素分析

河流生物群落组成由多种环境因子共同作用形成,但其影响机制尚不清楚。本研究基于环境DNA技术,选择黄河流域下游4条山区河流(锦绣川、锦阳川、锦云川和三川汇合后河流)的10个样点开展大型底栖动物监测。结果发现:不同溪段水质状况有所差异,锦云川盐化程度(以电导率EC表征)和营养盐浓度较高,锦阳川抗生素浓度较高,锦绣川水质较好。山区河流大型底栖动物群落组成差异明显,锦绣川以水生昆虫为主,软体动物占比较低。其中,昆虫纲的大蚊(Tipula abdominalis)、天角蜉(Uracanthella punctisetae)和寡毛纲的顠体虫(Aeolosoma sp.)是造成锦绣川与其他河流大型底栖动物群落结构差异的关键物种。冗余分析和变差分解分析结果表明,盐化、营养盐和抗生素均会对大型底栖动物群落组成产生影响。其中,EC的解释率为22.86%,营养盐中的TP、NH_(3)-N和TN的解释率分别为20.12%、13.25%和7.81%;此外,盐化可与营养盐和抗生素通过耦合效应对大型底栖动物群落组成产生影响,贡献率分别为21.60%和16.20%;抗生素与营养盐的贡献率为19.60%。逐步判别回归模型结果显示,Margalef指数(d)受盐化(EC)和营养盐(NH_(3)-N和NO_(3)^(-)-N)的共同影响;随着河流中EC浓度升高,d与NH_(3)-N之间的正响应关系及其与NO_(3)^(-)-N之间的负响应关系显著增强。因此,多环境因子对水生生物的影响不容忽视,在大型底栖动物生物多样性保护中应关注各类环境因子的影响贡献。

探索景观触媒效应下城市后工业景观设计推动山地城市更新的途径

后工业景观作为保护及利用工业遗产的重要范式,体现出生态修复、形象展示、文化传承、功能重组和产业开发的复合价值,已逐渐成为城市片区更新发展的重要抓手。根据当前后工业景观的现状与问题分析,发现在高质量城市更新的背景下,有必要从全局视角对成群成片的城市后工业景观更新进行整体性、持续化、多维度地思考。在此基础上,引入景观触媒效应的理论方法,剖析城市后工业景观触媒的特质,总结城市后工业景观在山地城市中的显著特征与设计关键;提出通过城市后工业景观触媒效应的激发推动老旧城市片区有机更新的实施途径,从而促进山地城市朝着生态功能健全、山城形象凸显、文化氛围浓厚、功能活力焕发、文旅业态兴旺的方向持续发展。

数字金融对绿色经济效率的影响——基于“两山”理论的研究

数字金融对绿色经济效率有何作为是亟待探讨的热点问题。“两山”理论对于加快形成绿色发展方式,促进经济发展和环境保护双赢提供了指引。基于“两山”理论的数字金融对绿色经济效率的机理和实证研究表明:我国的绿色经济效率呈现从东部向中、西部递减的特征;数字金融能够显著促进绿色经济效率的提升,这一结论在稳健性检验、内生性分析后依然成立,且这种提升效应存在区域异质性,数字金融对东部绿色经济效率的提升显著大于中部和西部;技术创新和产业结构升级是数字金融提升绿色经济效率的中介渠道;绿色经济效率存在显著的空间自相关性,数字金融的作用效果具有正向空间溢出效应,有助于提升邻地的绿色经济效率。

海上退役石油平台造礁的流场效应研究

将海上石油平台改建为人工鱼礁是一种理想的退役平台处置方式,流场对人工鱼礁发挥功效起着重要作用,而目前对平台造礁的流场效应仍有待研究。基于埕岛油田退役平台造礁示范工程,构建了渤海埕岛油田海域三维水动力数值模型,在实际海况条件下定量研究不同规模平台造礁对流场影响效应。结果表明:当布设鱼礁山后,在鱼礁山两侧及上方沿水平来流方向均形成流速增大区域,而迎流面和背流面出现了流速减小区域;与无鱼礁山时相比,随着鱼礁山高度增加和来流速度增大,鱼礁山区域流速变化幅度和变化区域面积逐渐增大,且鱼礁山高度对流速影响范围更大,来流速度则决定流速变化幅度;在垂向上会产生明显的上升流与背涡流,随着水平来流速度增大,鱼礁山高度对垂向流场的影响程度逐渐减小。

华南多雨山地果树避雨技术效果与成本分析

[目的]针对华南高海拔山地地区春、夏两季雨水过多造成沤花、裂果致落果而严重影响产量、品质问题,设计不同的避雨技术试验,对比避雨效果、投入与产出。[方法]以常规露地栽培作为对照组,设置周年避雨(钢架棚、竹木棚)及开花期遮阳网棚(树盘沥水、树盘沥水+覆膜、平垄覆膜、高垄覆膜)共6个避雨栽培处理,观察各处理新植树的成活率和生长量,结果树产量、裂果率、落果率和商品果率,以及分析各避雨栽培的投入与产出比。[结果]避雨处理新植果苗的成活率和生长量均显著高于对照;钢架棚、竹木棚全株避雨处理产量高、无裂果,落果少,沥水+地膜、高垄地膜土壤避雨处理产量较高、裂果较少;钢架棚初始投入最大、年投入最小、产出最大、利润最高,竹木棚初始投入较小、年投入最大、产出大、利润高,沥水+地膜初始投入、年投入均小、产出较大、利润较高。[结论]投资能力强的,推荐搭建钢架避雨棚;竹木资源充足的,推荐搭建竹木棚。投资能力较欠缺的,可搭建遮阳网临时避雨棚,结合沥水+地膜。新植果树苗,可采取沥水、树盘覆膜或沥水+覆膜措施,以提高定植成活率。

武陵山片区旅游产业集聚对共同富裕的空间溢出效应

使旅游业成为迈向共同富裕道路上具有时代特征的幸福产业,是“十四五”时期旅游高质量发展的基本遵循。文章基于2010—2019年武陵山片区42个县域单元的面板数据,利用区位熵与熵值法分别测算武陵山片区旅游产业集聚水平和共同富裕发展水平,并构建空间杜宾模型探析武陵山片区旅游产业集聚对共同富裕的影响及空间溢出效应。结果表明:武陵山片区旅游产业集聚水平明显提高且能显著提高共同富裕发展水平,并且具有正向空间溢出效应;武陵山片区共同富裕发展水平在空间上呈现出湖南片区>湖北片区>重庆片区>贵州片区的分布格局,共同富裕发展水平上升速度有待进一步加强;全社会固定资产投资、政府干预以及对外开放水平等因素均能在不同程度上促进共同富裕,其中全社会固定资产投资与政府干预二者均有正向的空间溢出效应,对外开放的正向空间溢出效应并不显著。

山区涉河桥梁墩柱冲磨破坏机理及防护措施

近年来自然灾害频发,山区桥梁水毁事故时有发生,针对山区涉河桥梁墩柱冲磨性能的提升正逐渐成为研究热点。该文综述山区涉河桥梁墩柱冲磨破坏机理及防护措施研究现状,并针对一种新型防护措施的防护效果进行数值模拟分析,以期为应对桥梁结构冲磨破坏问题提供参考。