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1. chinaXiv:202104.00089 [pdf]

Monthly and seasonal streamflow forecasting of large dryland catchments in Brazil

COSTA, Alexandre C; ESTACIO, Alvson B S; SOUZA FILHO, Francisco de A de; LIMA NETO, Iran E
Subjects: Geosciences >> Geography

Streamflow forecasting in drylands is challenging. Data is scarce, catchments are highly human-modified and streamflow exhibits strong nonlinear responses to rainfall. The goal of this study was to evaluate the monthly and seasonal streamflow forecasting in two large catchments in the Jaguaribe River Basin in the Brazilian semi-arid area. We adopted four different lead times: one month ahead for monthly scale and two, three and four months ahead for seasonal scale. The gaps of the historic streamflow series were filled up by using rainfall-runoff modelling. Then, time series model techniques were applied, i.e., the locally constant, the locally averaged, the k-nearest-neighbours algorithm (k-NN) and the autoregressive model (AR). The criterion of reliability of the validation results is that the forecast is more skillful than streamflow climatology. Our approach outperformed the streamflow climatology for all monthly streamflows. On average, the former was 25% better than the latter. The seasonal streamflow forecasting (SSF) was also reliable (on average, 20% better than the climatology), failing slightly only for the high flow season of one catchment (6% worse than the climatology). Considering an uncertainty envelope (probabilistic forecasting), which was considerably narrower than the data standard deviation, the streamflow forecasting performance increased by about 50% at both scales. The forecast errors were mainly driven by the streamflow intra-seasonality at monthly scale, while they were by the forecast lead time at seasonal scale. The best-fit and worst-fit time series model were the k-NN approach and the AR model, respectively. The rainfall-runoff modelling outputs played an important role in improving streamflow forecasting for one streamgauge that showed 35% of data gaps. The developed data-driven approach is mathematical and computationally very simple, demands few resources to accomplish its operational implementation and is applicable to other dryland watersheds. Our findings may be part of drought forecasting systems and potentially help allocating water months in advance. Moreover, the developed strategy can serve as a baseline for more complex streamflow forecast systems.

submitted time 2021-04-22 From cooperative journals:《Journal of Arid Land》 Hits16Downloads12 Comment 0

2. chinaXiv:202104.00090 [pdf]

Plant community dynamics in arid lands: the role of desert ants

SHARAFATMANDRAD, Mohsen ; KHOSRAVI MASHIZI, Azam
Subjects: Geosciences >> Geography

Ants (Formicidae, Hymenoptera) play an important role in seed bank, seedling establishment and plant composition of arid ecosystems. Thus, knowing plant-ant interaction provides useful information for managers to design restoration and conservation plans. In this study, the roles of desert harvester ants (Messor intermedius and Messor melancholicus) and scavenger ants (Cataglyphis nodus and Lepisiota semenovi) on plant communities were investigated in arid ecosystems of southeastern Iran. Two vegetation types were distinguished in the study area and the nest density of ant species was determined. Furthermore, plant composition and soil seed bank were estimated at different distances from the ant nests. Results showed that the density of M. intermedius and M. melancholicus nests was higher in dwarf shrub-shrub vegetation type and the density of C. nodus and L. semenovi nests was higher in dwarf shrub vegetation type. The harvester and scavenger ants had enhanced the seed bank to 55% and 70%, respectively. Therefore, the role of scavenger ants on the plant communities' seed bank was greater than that of harvester ants. Although the scavenger ants were more influential on the annuals and the invasive plant species, the radius impact of the harvester ants on the perennials was greater, i.e., a positive interaction existed between the perennial plants and the harvester ants. C. nodus and L. semenovi played an important role in enhancing the ecosystem's potential for restoration through establishment of pioneer species in early stage of succession. The activity of M. intermedius is crucial for the development and maintenance of climax plant communities in arid ecosystems through assisting the plant species' establishment in late stage of succession. It is essential to preserve the diversity of these key ant species for the maintenance and sustainability of shrubs in arid ecosystems.

submitted time 2021-04-22 From cooperative journals:《Journal of Arid Land》 Hits11Downloads8 Comment 0

3. chinaXiv:202104.00091 [pdf]

Optimization designs of artificial facilities in deserts based on computational simulation

DUN,Hongchao; HUANG,Ning; ZHANG,Jie
Subjects: Geosciences >> Geography

Sediment transport of sand particles by wind is one of the main processes leading to desertification in arid regions, which severely impairs the ability of mankind to produce and live by drifting sand into settlements. Optimization designs of artificial facilities have lately attracted extensive interest for human settlement systems in deserts because of their acceptable protection effect, convenience of implementation, and low material cost. However, the complexity of a settlement system poses challenges concerning finding suitable materials, artificial facilities, and optimization designs for sand deposition protection. In an effort to overcome these challenges, we propose a settlement system built with brick, solar panel, and building arrays to meet the basic needs of human settlements in arid regions while preventing wind-sand disasters. The wind flow and movement characteristics of sand particles in the brick, panel, and building arrays were calculated using computational fluid dynamics and discrete phase model. The performance of three types of arrays in wind-sand flow in terms of decreasing the wind velocity and sand-particle invasion distance was evaluated. The results show that the wind velocity near the surface and the sand invasion distance were significantly decreased in the space between the brick arrays through properly selected vertical size and interspaces, indicating that the brick arrays have an impressive sand fixing and blocking performance; their effective protection distance was 3–4 m. The building arrays increased the near-surface wind velocity among buildings, resulting in less deposition of sand particles. The solar panel arrays were similar to the building arrays in most cases, but the deposition of sand particles on solar panels exerted a negative effect on energy utilization efficiency. Therefore, taking the optimal configuration of the settlement system into consideration, this study concludes that (1) brick arrays, which were proven effective in preventing sand particles, must be arranged in an upwind area; (2) solar panel arrays could accelerate the wind flow, so they are best to be arranged at the place where sand particles deposited easily; and (3) building arrays present a better arrangement in downwind areas.

submitted time 2021-04-22 From cooperative journals:《Journal of Arid Land》 Hits11Downloads8 Comment 0

4. chinaXiv:202104.00092 [pdf]

Impact of utility-scale solar photovoltaic array on the aeolian sediment transport in Hobq Desert, China

TANG, Guodong; MENG, Zhongju; GAO, Yong; DANG, Xiaohong
Subjects: Geosciences >> Geography

Deserts are ideal places to develop ground-mounted large-scale solar photovoltaic (PV) power station. Unfortunately, solar energy production, operation, and maintenance are affected by geomorphological changes caused by surface erosion that may occur after the construction of the solar PV power station. In order to avoid damage to a solar PV power station in sandy areas, it is necessary to investigate the characteristics of wind-sand movement under the interference of solar PV array. The study was undertaken by measuring sediment transport of different wind directions above shifting dunes and three observation sites around the PV panels in the Hobq Desert, China. The results showed that the two-parameter exponential function provides better fit for the measured flux density profiles to the near-surface of solar PV array. However, the saltation height of sand particles changes with the intersection angle between the solar PV array and wind direction exceed 45°. The sediment transport rate above shifting dunes was always the greatest, while that around the test PV panels varied accordingly to the wind direction. Moreover, the aeolian sediment transport on the solar PV array was significantly affected by wind direction. The value of sand inhibition rate ranged from 35.46% to 88.51% at different wind directions. When the intersection angle exceeds 45°, the mean value of sediment transport rate above the solar PV array reduces to 82.58% compared with the shifting dunes. The results of our study expand our understanding of the formation and evolution of aeolian geomorphology at the solar PV footprint. This will facilitate the design and control engineering plans for solar PV array in sandy areas that operate according to the wind regime.

submitted time 2021-04-22 From cooperative journals:《Journal of Arid Land》 Hits12Downloads7 Comment 0

5. chinaXiv:202104.00093 [pdf]

Soil bacterial characteristics between surface and subsurface soils along a precipitation gradient in the Alxa Desert, China

TENG, Zeyu; XIAO, Shengchun; CHEN, Xiaohong; HAN, Chao
Subjects: Geosciences >> Geography

Bacteria in desert soil have unique phylogeny and important ecological functions, and their responses to changes in precipitation need further attention. However, relevant studies have mainly focused on the surface soil, and studies on the responses of bacteria at different soil depths to variations in precipitation are rare. Thus, we used 16S rDNA high-throughput sequencing to investigate the changes in soil bacterial distribution along a mean annual precipitation gradient (50–150 mm) in the Alxa Desert, China, and compared the variation characteristics in the surface soil layer (0–10 cm) and subsurface soil layer (10–20 cm). Results showed that soil bacterial communities significantly changed along the precipitation gradient in both soil layers. However, the subsurface soil layer could support bacterial communities with higher diversity and closer internal relationships but more internal competition than the surface soil layer. Additionally, compared with the surface soil layer, variations in diversity and co-occurrence patterns in the subsurface soil layer were more in line with the changes in the mean annual precipitation, while bacterial community structure was less variable in the subsurface soil layer. Compared with the mean annual precipitation, soil moisture had little influence on the structure and diversity of soil bacterial community but had a high correlation with intercommunity connectivity. Therefore, soil moisture might play a complex role in mediating environmental conditions and soil bacterial community characteristics. Due to the different responses of surface and subsurface soil bacteria to the changes in precipitation, it is necessary to distinguish different soil layers when predicting the trends in desert soil bacterial conditions associated with precipitation, and prediction of subsurface soil bacteria may be more accurate.

submitted time 2021-04-22 From cooperative journals:《Journal of Arid Land》 Hits12Downloads7 Comment 0

6. chinaXiv:202104.00094 [pdf]

Snowpack shifts cyanobacterial community in biological soil crusts

ZHANG, Bingchang; ZHANG, Yongqing; ZHOU, Xiaobing; LI, Xiangzhen; ZHANG, Yuanming
Subjects: Geosciences >> Geography

Winter snowpack is an important source of moisture that influences the development of biological soil crusts (BSCs) in desert ecosystems. Cyanobacteria are important photosynthetic organisms in BSCs. However, the responses of the cyanobacterial community in BSCs to snowpack, snow depth and melting snow are still unknown. In this study, we investigated the cyanobacterial community composition and diversity in BSCs under different snow treatments (doubled snow, ambient snow and removed snow) and three snow stages (stage 1, snowpack; stage 2, melting snow; and stage 3, melted snow) in the Gurbantunggut Desert in China. In stages 1 and 2, Cyanobacteria were the dominant phylum in the bacterial community in the removed snow treatment, whereas Proteobacteria and Bacteroidetes were abundant in the bacterial communities in the ambient snow and doubled snow treatments. The relative abundances of Proteobacteria and Bacteroidetes increased with increasing snow depth. The relative abundances of Cyanobacteria and other bacterial taxa were affected mainly by soil temperature and irradiance. In stages 2 and 3, the relative abundance of Cyanobacteria increased quickly due to the suitable soil moisture and irradiance conditions. Oscillatoriales, Chroococcales, Nostocales, Synechococcales and unclassified Cyanobacteria were detected in all the snow treatments, and the most dominant taxa were Oscillatoriales and Chroococcales. Various cyanobacterial taxa showed different responses to snowpack. Soil moisture and irradiance were the two critical factors shaping the cyanobacterial community structure. The snowpack depth and duration altered the soil surface irradiance, soil moisture and other soil properties, which consequently were selected for different cyanobacterial communities. Thus, local microenvironmental filtering (niche selection) caused by snow conditions may be a dominant process driving shifts in the cyanobacterial community in BSCs.

submitted time 2021-04-22 From cooperative journals:《Journal of Arid Land》 Hits12Downloads8 Comment 0

7. chinaXiv:202104.00095 [pdf]

Glacier mass balance in High Mountain Asia inferred from a GRACE release-6 gravity solution for the period 2002–2016

XIANG, Longwei; WANG, Hansheng; JIANG, Liming; SHEN, Qiang; STEFFEN, Holger ; LI, Zhen
Subjects: Geosciences >> Geography

We provide estimates of glacier mass changes in the High Mountain Asia (HMA) area from April 2002 to August 2016 by employing a new version of gravity solutions of the Gravity Recovery and Climate Experiment (GRACE) twin-satellite mission. We found a total mass loss trend of the HMA glaciers at a rate of –22.17 (±1.96) Gt/a. The largest mass loss rates of –7.02 (±0.94) and –6.73 (±0.78) Gt/a are found for the glaciers in Nyainqentanglha Mountains and Eastern Himalayas, respectively. Although most glaciers in the HMA area show a mass loss, we find a small glacier mass gain of 1.19 (±0.55) and 0.77 (±0.37) Gt/a in Karakoram Mountains and West Kunlun Mountains, respectively. There is also a nearly zero mass balance in Pamirs. Our estimates of glacier mass change trends confirm previous results from the analysis of altimetry data of the ICESat (Ice, Cloud and Land Elevation) and ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) DEM (Digital Elevation Model) satellites in most of the selected glacier areas. However, they largely differ to previous GRACE-based studies which we attribute to our different post-processing techniques of the newer GRACE data. In addition, we explicitly show regional mass change features for both the interannual glacier mass changes and the 14-a averaged seasonal glacier mass changes. These changes can be explained in parts by total net precipitation (net snowfall and net rainfall) and net snowfall, but mostly by total net radiation energy when compared to data from the ERA5-Land meteorological reanalysis. Moreover, nearly all the non-trend interannual mass changes and most seasonal mass changes can be explained by the total net radiation energy data. The mass loss trends could be partly related to a heat effect due to increased net rainfall in Tianshan Mountains, Qilian Mountains, Nyainqentanglha Mountains and Eastern Himalayas. Our new results for the glacier mass change in this study could help improve the understanding of glacier variation in the HMA area and contribute to the study of global change. They could also serve the utilization of water resources there and in neighboring areas.

submitted time 2021-04-22 From cooperative journals:《Journal of Arid Land》 Hits14Downloads7 Comment 0

8. chinaXiv:202104.00046 [pdf]

基于地理探测器的欠发达地区健康资源 时空分异及影响因素研究

赵海莉; 王启雯
Subjects: Geosciences >> Geography

医疗卫生资源是健康服务体系的基础和保障,高水平、高均衡性的医疗卫生资源是人民健 康的保障。以甘肃省为例,基于卫生资源集聚度和变异系数、基尼系数、泰尔指数及分解,分析 2010—2017 年甘肃省 14 个市、州医疗卫生资源水平及均衡性的差异,运用地理探测器模型分析影 响因素。结果表明:(1)2010—2017 年甘肃省医疗卫生资源水平及其均衡性整体上升。(2)医疗卫 生资源水平及均衡性分布呈现东南>西北的格局,经济较好的陇中、陇东地区优于其他地区,其中兰 州市资源水平及均衡性最高。(3)甘肃省人均医疗卫生资源水平及均衡性要优于地均医疗卫生资 源,河西地区由于面积广阔、人口集聚度相对较小,人均均衡性明显优于地均均衡性。(4)甘肃省整 体医疗卫生资源水平差异逐渐减小,医疗卫生资源均衡性得到了较好的改善,同时其区域内差异 减小、区域间差异逐渐增大,且河西地区和陇中地区的内部差异是甘肃省整体差异的主要贡献 者。(5)经济水平是影响医疗卫生资源水平的主导因素,人均国内生产总值和人口老龄化与其他因 子的交互作用的解释力较高,同时自然因素的解释力逐年上升。

submitted time 2021-04-14 From cooperative journals:《干旱区地理》 Hits127Downloads50 Comment 0

9. chinaXiv:202104.00047 [pdf]

新疆文化资源空间分布特征及成因分析 ——以非物质文化遗产为例

王春燕
Subjects: Geosciences >> Geography

非物质文化遗产根植于特定的生存环境,见证了人类历史的发展,其空间分布与人类迁 徙、文明的传播与扩散有着紧密的联系。新疆是古代陆路丝绸之路重要节点,古代中西文化、经济 交流的交汇地,非遗丰富多样,但对自然与人文因素与其空间分布关联却鲜有学者研究。通过借 助 ArcGIS 空间分析功能,对新疆(含生产建设兵团)国家级、自治区级 484 项非遗项目进行空间分 析,并首次从历史视角将人类迁徙、古丝绸之路纳入到非遗空间成因中。结果显示:(1)新疆非遗 整体为凝聚型,中原文化传入为主体的传统戏剧、曲艺零星分布个别区域,与生活密切相关的传统 技艺、传统舞蹈、传统音乐等均匀分布,形成多个高密度区;其中民间文学、传统音乐、传统舞蹈彼 此空间近邻,互相依存,相伴而生;天山以南的塔克拉玛干沙漠边缘一带,古陆路丝绸之路主要驿 站成为传统技艺、传统音乐和传统舞蹈大多分布的高密度区域。(2)新疆非遗空间不仅与地貌、河 流分布有关,同时古丝绸之路、人类迁徙对非遗的扩散与发展具有重大影响,而经济发展水平的影 响具有多面性。研究结果对非遗开发,丝绸之路沿线城市国家文化协同发展具有重要的参考价值。

submitted time 2021-04-14 From cooperative journals:《干旱区地理》 Hits136Downloads56 Comment 0

10. chinaXiv:202104.00048 [pdf]

“15 分钟生活圈”视角下住宅小区与公共服务 设施空间配置评价 ——以乌鲁木齐市为例

肖凤玲; 杜宏茹; 张小雷
Subjects: Geosciences >> Geography

新型城镇化高质量发展更加注重提升人民群众的幸福感和获得感,加大“15 分钟生活圈” 公共服务建设力度能有效提升人民群众生活满意度。基于国家“15 分钟生活圈”建设要求使用高 德地图 POI 数据,采用核密度估计、缓冲区分析、栅格分析等方法,对乌鲁木齐市公共服务设施的空 间覆盖特征进行判断,对住宅小区与各类设施的空间匹配状况进行综合评价。研究表明:(1)不同 类型基础公共服务设施的空间布局特征有所差异,既与住宅小区的集聚分布有一定关联,又体现 了不同设施的属性特点。(2)不同类型的基础公共服务设施在住宅小区“15 分钟生活圈”的覆盖率 有一定的差异,以公交站点为代表的公共交通出行的覆盖率最高,便民商业设施中超市、果蔬店、 理发店等日常服务设施的覆盖率相对高于银行、电讯营业厅等设施,教育设施中幼儿园覆盖率最 高,其次为小学,中学的覆盖率相对较低。医疗设施服务覆盖率在各类型中差别不显著,卫生服务 中心、药店、诊所基本都能实现 95%的覆盖率。(3)不同类型基本公共服务与住宅空间配置达标率 存在较明显区域差异。在人口分布越密集的区域,便民商业、教育、医疗、交通 4 类公共服务设施均 达标的住宅小区比例越高,而人口密度相对较低的外围区域和新建城区医疗和便民商业设施的达 标率偏低。(4)乌鲁木齐市建设“15 分钟活动圈”应注重加强新建城区的公共服务配套,尤其是便民 商业和基层医疗设施,老城区应加强改造过程中公共服务的更新配套。

submitted time 2021-04-14 From cooperative journals:《干旱区地理》 Hits115Downloads42 Comment 0

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