Journal of Hydrology-Regional Studies最新文献

{"title":"Sampling frequency significantly influenced surface soil moisture dynamics but not its prediction accuracy in an arid mountain forest","authors":"Xi Zhu,&nbsp;Zhibin He,&nbsp;Jun Du,&nbsp;Longfei Chen,&nbsp;Pengfei Lin,&nbsp;Quanyan Tian","doi":"10.1016/j.ejrh.2024.102065","DOIUrl":"10.1016/j.ejrh.2024.102065","url":null,"abstract":"<div><h3>Study region</h3><div>a typical arid mountain region of northwestern China.</div></div><div><h3>Study focus</h3><div>Soil water content (SWC) is the key factor regulating patchy vegetation patterns in arid/semiarid areas. However, accurately determining the regional SWC status remains a challenge due to the time and labor-intensive nature of manual sampling methods. Furthermore, a thorough understanding of the influence of different sampling frequencies (SFs) on SWC spatio-temporal dynamics in arid mountain forests is lacking.</div></div><div><h3>New hydrological insights for the region</h3><div>SFs had a distinct effect on mean SWC, and temporal stability characteristics under lower (15–45 days, LSFs) and higher SFs (within 7 days, HSFs). SF influenced mean SWC for 0–20 cm under HSFs only but had a significant influence for 0–20 and 40–60 cm under LSFs. SF did not influence Spearman’s rank correlation coefficient (<em>r</em>_<em>s</em>) for the 0–20 cm layer, but had a significant effect on the standard deviation of mean relative difference (SDRD) under HSFs; however, SF had a significant effect on <em>r</em>_<em>s</em> for the deep layer (80–100 cm), but did not influence SDRD under LSFs. Although the number of representative locations (RLs) was significantly higher under HSFs than LSFs, no RLs were found at 100–120 cm. The mean SWC for all soil depths except 40–100 cm under HSFs was predicted accurately for each SF. This indicated that HSFs were not conducive to the identification of deep soil RLs, and had a significant impact on the prediction accuracy of SWC for deep layers. LSFs were not conducive to the identification of surface soil RLs but they can accurately estimate mean SWC, and prediction accuracy improved when SF was reduced. These results have important implications for optimizing water sampling schemes and promoting sustainable ecological development in water-deficient regions.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"56 ","pages":"Article 102065"},"PeriodicalIF":4.7,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporal variability of terrestrial water storage and climate response processes in the Tianshan from geodetic observations","authors":"Tao Chen ,&nbsp;Yuanjin Pan ,&nbsp;Hao Ding ,&nbsp;Jiashuang Jiao ,&nbsp;Meilin He ,&nbsp;Yixin Xiao","doi":"10.1016/j.ejrh.2024.102061","DOIUrl":"10.1016/j.ejrh.2024.102061","url":null,"abstract":"<div><h3>Study region</h3><div>The Tianshan region</div></div><div><h3>Study focus</h3><div>Against the backdrop of ongoing global climate warming, the terrestrial water storage (TWS) changes are a complex dynamic process closely linked to climate change in the Tianshan. However, current researches in the Tianshan only focus on a specific component of TWS and are mainly analysed and discussed by using the Gravity Recovery and Climate Experiment (GRACE) observations, while the inversion results from Global Navigation Satellite System (GNSS) observations with high sensitivity and temporal resolution and their response analysis to extreme climate events are lacking.</div></div><div><h3>New hydrological insight for the region</h3><div>The synthetic test show that (1) the GNSS stations in the Tianshan are able to recover the TWS changes in this region, and the recovery is better in the east Tianshan. The actual inversion results show that (2) the TWS changes inferred from various datasets exhibit good consistency in the spatiotemporal characteristics. Seasonal TWS changes all show a decreasing trend from western Tianshan to eastern Tianshan, but the GNSS observations show a larger magnitude than the GRACE and Global Land Data Assimilation System (GLDAS) observations. The annual phases in the southern Tianshan are about 2 months later than those in the northern Tianshan. Additionally, we also investigate the relationship between the interannual TWS changes and El Niño/Southern Oscillation (ENSO). The results show that (3) the interannual TWS changes inferred from the GNSS observations can more accurately detect hydrological anomalies induced by ENSO and better correspond to the abrupt years of spatial grid anomalies in the precipitation and atmospheric water vapor content, indicating that precipitation is a main driving factor of the TWS changes in the Tianshan. Our goal is to emphasize the significant potential of GNSS in estimating the TWS changes and to help monitor the impact of extreme climate changes on the hydrological processes.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"56 ","pages":"Article 102061"},"PeriodicalIF":4.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Response patterns of mountain river deltas and adjacent coasts to the changes in sediment discharge: A case study of Minjiang River, China","authors":"Chengtao Wang ,&nbsp;Feng Cai ,&nbsp;Hongshuai Qi ,&nbsp;Shaohua Zhao ,&nbsp;Gen Liu ,&nbsp;Yanyu He ,&nbsp;Huiquan Lu ,&nbsp;Yi Sun ,&nbsp;Ting Zhang","doi":"10.1016/j.ejrh.2024.102051","DOIUrl":"10.1016/j.ejrh.2024.102051","url":null,"abstract":"<div><h3>Study region</h3><div>The Minjiang River, located on the western side of the Taiwan Strait of East Asia, serves as a typical mountain river estuary system.</div></div><div><h3>Study focus</h3><div>This research investigates the impact of reduced sediment discharge on the geomorphological changes in the Minjiang River estuary delta and its adjacent coasts. By integrating 45 years of shoreline data and nautical chart bathymetry, the study quantitatively delineates tempo-spatial change patterns and reveals the rapid response mechanisms to sediment discharge decrease.</div></div><div><h3>New hydrological insights for the region</h3><div>The study demonstrates that the sandy shoreline near the Minjiang River estuary exhibits distinct tempo-spatial evolution patterns primarily due to decreased sediment discharge. The estuarine transition zone shows greater coastal resilience, with shoals providing essential sediment sources for development, while the shoreline south of the transition zone experiences progressively delayed erosion. The Minjiang River delta reacts swiftly to decreased sediment discharge, with a response time of significantly under ten years. Despite the temporary influence of extreme weather events such as typhoons on erosion states, continuous sediment discharge decrease remains the dominant factor. These insights highlight the heightened sensitivity and rapid adaptability of mountain rivers to environmental shifts, providing significant implications for understanding the repercussions of human activities on estuarine geomorphological alterations.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"56 ","pages":"Article 102051"},"PeriodicalIF":4.7,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction and verification of distributed hydrothermal coupling model in the source area of the Yangtze River","authors":"Yongde Gan ,&nbsp;Qingqing Li ,&nbsp;Huan Liu ,&nbsp;Xuanxuan Wang ,&nbsp;Yangwen Jia ,&nbsp;Yushuai Wu ,&nbsp;Zuhao Zhou","doi":"10.1016/j.ejrh.2024.102057","DOIUrl":"10.1016/j.ejrh.2024.102057","url":null,"abstract":"<div><h3>Study region</h3><div>The source area of the Yangtze River, a typical catchment in the cryosphere on the Tibet Plateau, was used to develop and validate a distributed hydrothermal coupling model.</div></div><div><h3>Study focus</h3><div>Climate change has caused significant changes in hydrological processes in the cryosphere, and related research has become hot topic. The source area of the Yangtze River (SAYR) is a key catchment for studies of hydrological processes in the cryosphere, which contains widespread glacier, snow, and permafrost. However, the current hydrological modeling of the SAYR rarely depicts the process of glacier/snow and permafrost runoff from the perspective of coupled water and heat transfer, resulting in distortion of simulations of hydrological processes. Therefore, we developed a distributed hydrothermal coupling model, namely WEP-SAYR, based on the WEP-L (Water and energy transfer process in large river basins) model by introducing modules for glacier and snow melt and permafrost freezing and thawing.</div></div><div><h3>New hydrological insights for the region</h3><div>In the WEP-SAYR model, the soil hydrothermal transfer equations were improved, and a freezing point equation for permafrost was introduced. In addition, the glacier and snow meltwater processes were described using the temperature index model. Compared to previously applied models, the WEP-SAYR portrays in more detail glacier/snow melting, dynamic changes in permafrost water and heat coupling, and runoff dynamics, with physically meaningful and easily accessible model parameters. The model can describe the soil temperature and moisture changes in soil layers at different depths from 0 to 140 cm. Moreover, the model has a good accuracy in simulating the daily/monthly runoff and evaporation. The Nash-Sutcliffe efficiency exceeded 0.75, and the relative error was controlled within ±20 %. The results showed that the WEP-SAYR model balances the efficiency of hydrological simulation in large scale catchments and the accurate portrayal of the cryosphere elements, which provides a reference for hydrological analysis of other catchments in the cryosphere.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"56 ","pages":"Article 102057"},"PeriodicalIF":4.7,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of hydrogeochemistry of the hot springs on both sides of the Nujiang River near Baoshan in the Yunnan-Tibet Geothermal Belt","authors":"Jingru Ma ,&nbsp;Xun Zhou ,&nbsp;Yanqiu Wu ,&nbsp;Linyang Zhuo ,&nbsp;Mengmeng Wang ,&nbsp;Yu Liu ,&nbsp;Hongfei Xu ,&nbsp;Yixuan Wang ,&nbsp;Guangbin Tao ,&nbsp;Jingwen Cui ,&nbsp;Chun Wang ,&nbsp;Yanxiang Shi ,&nbsp;Tong Zhang ,&nbsp;Mengying Chen ,&nbsp;Qiqi Liu","doi":"10.1016/j.ejrh.2024.102055","DOIUrl":"10.1016/j.ejrh.2024.102055","url":null,"abstract":"<div><h3>Study region</h3><div>The Nujiang Fault Zone near Baoshan in western Yunnan.</div></div><div><h3>Study focus</h3><div>Major hydrochemical elements and stable isotopes of 15 hot spring water samples are analyzed to reveal hydrogeochemical evolution processes, recharge sources, geothermal conditions, and structural control genesis of the hot springs.</div></div><div><h3>New hydrological insight for the region</h3><div>Baoshan is experiencing a wave of clean energy development, specifically geothermal energy. The Nujiang Fault Zone, which separates the Tengchong Block from the Baoshan Block, constitutes a low- to medium-temperature geothermal system characterized by numerous hot springs. The hot springs under investigation are located near Baoshan along the Nujiang Fault. Four hydrochemical types have been identified, with HCO₃-Ca⋅Mg being the predominant type. The primary components of spring waters originate from the weathering or dissolution of carbonate and silicate minerals, as well as the reverse cation exchange. Stable isotopes indicate that these hot springs are predominantly formed by the atmospheric precipitation during the summer monsoon. The recharge areas are located in the mountainous regions around the Nujiang River, at elevations ranging from 1606 to 2504 m and temperatures between 3°C and 8°C. The estimated temperature of the geothermal reservoir ranges from 73°C to 192°C. During the ascent process, the mixing ratio of cold water is between 60 % and 79 %, and the circulation depth ranges from 1928 to 4221 m. The positive correlation between Li and Cl indicates that hot springs originate from the same parent geothermal fluid controlled by the Nujiang Fault or by two secondary faults intersecting at depths. The hot springs with shallower circulation depths are mainly composed of HCO₃-Ca⋅Mg type, while the deeper circulating spring waters consist primarily of HCO₃-Na type. The height difference between the discharge location of the hot springs and the surface of the Nujiang River correlates positively with the geothermal reservoir temperature. This paper emphasizes the hydrogeochemical characterization of hot springs within regional fault zones, which holds significant implications for the development and exploration of geothermal systems in similar structural control areas.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"56 ","pages":"Article 102055"},"PeriodicalIF":4.7,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prediction of long-term future runoff under multi-source data assessment in a typical basin of the Yangtze River","authors":"Zheng Wang ,&nbsp;Mingwei Li ,&nbsp;Xuan Zhang ,&nbsp;Fanghua Hao ,&nbsp;Yongshuo H. Fu","doi":"10.1016/j.ejrh.2024.102053","DOIUrl":"10.1016/j.ejrh.2024.102053","url":null,"abstract":"<div><h3>Study region</h3><div>Three Typical Basins of the Yangtze River (YRB), China</div></div><div><h3>Study focus</h3><div>Meteorological factors, such as precipitation, are key drivers of the hydrological system and critical inputs in hydrological modeling, and accurate meteorological data are essential to simulate hydrological processes. This study compares and evaluates the CN05.1, CMFD, and ERA5-L and meteorological forcing datasets in three typical basins of the Yangtze River and predicts the future runoff changes in the basin based on CMIP6 data.</div></div><div><h3>New hydrological insights for the region</h3><div>This study indicated that (1) the CN05.1 data exhibit the best applicability on the interannual and intra-annual scales in YRB, while ERA5-Land performs better in the upper reaches, and CMFD is more suitable for the middle and lower reaches. (2) Future runoff is projected to initially decrease and then increase, with the inflection and inflections points of runoff occurring earlier in the ssp585 scenario compared to the ssp245. The risk of spring flooding is increasing in CS and JZ river basin, and the risk of flooding is decreasing in the FH River Basin as the flood peaks are earlier. (3) Significant trend changes are anticipated in the future, with climate change contributing over 90 % of the runoff changes in the CS, while human factors will increasingly influence the JZ and FH basins.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"56 ","pages":"Article 102053"},"PeriodicalIF":4.7,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of turbidity current plunging and floating woody debris in a reservoir during flood events","authors":"Fong-Zuo Lee ,&nbsp;Jihn-Sung Lai ,&nbsp;Sameh Ahmed Kantoush ,&nbsp;Tetsuya Sumi","doi":"10.1016/j.ejrh.2024.102027","DOIUrl":"10.1016/j.ejrh.2024.102027","url":null,"abstract":"<div><h3>Study region</h3><div>Many reservoirs worldwide experience the challenge of managing woody debris and determining the feasible location to set a floating barrier as a mitigation strategy to restrict their progression towards the dam. While the turbidity current plunges along the reservoir bed to form the underflow mud layer, the reverse current generated in the plunging flow region holds the woody debris.</div></div><div><h3>Study focus</h3><div>The present study attempts to define the plunging zone in correlation with the floating woody debris based on field observations, densimetric Froude number, plunging formula, and entrainment formula to investigate the plunge point location. When woody debris is carried by the sediment-laden inflow through the reservoir, the volume of woody debris needs to be estimated and extracted after the flood recession.</div></div><div><h3>New hydrological insight for the region</h3><div>According to the results of the analysis, the plunge point location was suggested as the critical condition of the densimetric Froude number for a floating barrier setup. Two proposed equations are presented to identify the turbidity current vertical profiles of velocity and sediment concentration. Considering hydrological conditions, the inflow peak sediment yield has added an optimal quantitative estimation of woody debris volumes than that by inflow peak discharge, total inflow sediment yield, maximum rainfall intensity, and total rainfall. The presented threshold values of hydrological patterns can serve as a critical warning indicator for the preparation of extraction operations for floating woody debris.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"56 ","pages":"Article 102027"},"PeriodicalIF":4.7,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seasonal and diurnal variations in turbidity in midwestern freshwater streams","authors":"Galina Shinkareva ,&nbsp;Catherine M. O’Reilly ,&nbsp;William L. Perry","doi":"10.1016/j.ejrh.2024.102044","DOIUrl":"10.1016/j.ejrh.2024.102044","url":null,"abstract":"<div><h3>Study region</h3><div>Midwestern United States.</div></div><div><h3>Study focus</h3><div>Turbidity is a commonly used metric of water quality in streams and can be influenced by many factors. The objective of this study was to explore how turbidity changes on short, daily, timescales.</div></div><div><h3>New hydrological insights for the region</h3><div>Turbidity was measured at 15-minute intervals over a seven-year period in two watersheds in central Illinois. We documented diurnal turbidity cycles that were consistent and independent of discharge. Maximum daily levels occurred between 23:00 and 05:00, and minimum values occurred between 13:00 and 18:00, with night-time turbidity averaging 2.3 times higher than day-time turbidity values. The diurnal magnitude of turbidity change for Money and Six Mile Creeks tended to be significantly greater during June, July, August and September relative to other periods of the year. These months coincide with water temperatures above 10°C which suggests a potentially important role of biological activity as a main driver of diurnal turbidity changes. During this warm-water season, the diurnal turbidity magnitude also corresponded with the lunar cycles. Median nighttime turbidity values for warm months during lunar phases with lowest moonlight levels (new moon, waxing and waning crescent) were typically higher than during the phases with highest moonlight availability (full moon, waxing and waning gibbous), which may be related to nocturnal foraging and mating activities of fish, amphibians and bivalve species that inhabit both streams.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"56 ","pages":"Article 102044"},"PeriodicalIF":4.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conceptual groundwater model of the north-eastern flanks of Mount Kenya","authors":"Manon Trottet ,&nbsp;Hanspeter Liniger ,&nbsp;Daniel Hunkeler ,&nbsp;Philip Brunner","doi":"10.1016/j.ejrh.2024.101989","DOIUrl":"10.1016/j.ejrh.2024.101989","url":null,"abstract":"<div><div>Despite serious concerns over declining river flows and prolonged dry spells in the north-eastern region of Mount Kenya and the Ewaso Ng’iro River watershed many aspects of the groundwater system remain unexplored. In particular, the recharge-discharge dynamics of the Ewaso Ng’iro River have not been studied, and no conceptual groundwater model currently links the recharge areas in the high-elevation humid regions to the drier lowlands. This study aims to address this significant knowledge gap by assessing the recharge-discharge dynamics of the Ewaso Ng’iro River and identifying the relevant groundwater subsystems and the main flow paths within the various lava layers constituting the aquifer system. Hydrochemical and stable isotope analyses revealed three distinct subsystems with slightly different chemistries and different recharge zones, all of recent meteoric origin. Groundwater from Mt. Kenya is of the HCO₃-Na-Mg-Ca type with no dominant cations, whereas groundwater from the Nyambene Range, the other surrounding volcanic hills in the area, is of the HCO₃-Na type. Groundwater in the third subsystem in between is of the HCO₃-Mg type and is confined or semi-confined. In this area, carbon-13 analysis showed a strong influence of mantle-derived CO₂ on the groundwater chemistry (very high electrical conductivity and left-shifted oxygen-18 ratios). Finally, major ions and stable isotopes (ẟ¹⁸O and ẟ²H) confirmed that during the dry season, the river is entirely groundwater-fed, with the Mt. Kenya subsystem contributing half of the maximum river flow rate of 800 l/s.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"56 ","pages":"Article 101989"},"PeriodicalIF":4.7,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential impact of precipitation temporal structure on meteorological drought and vegetation condition: A case study on Qinghai-Tibet Plateau","authors":"Houliang Lu ,&nbsp;Jun Qiu ,&nbsp;Bill X. Hu ,&nbsp;Fangfang Li","doi":"10.1016/j.ejrh.2024.102048","DOIUrl":"10.1016/j.ejrh.2024.102048","url":null,"abstract":"<div><h3>Study region</h3><div>Qinghai-Tibet Plateau (QTP).</div></div><div><h3>Study focus</h3><div>The Qinghai-Tibet Plateau (QTP) is sensitive to climate change and ecologically fragile. Researches on precipitation over the QTP mainly focus on quantity and frequency, overlooking its temporal distribution. However, subtle changes in precipitation can significantly impact the natural environment and lead to natural disasters. This work primarily focuses on the response of meteorological drought and vegetation growth to the precipitation temporal structure. The precipitation temporal structure is quantified from the perspectives of the contribution of heavy precipitation (concentration index, CI) and the temporal distribution of total precipitation (standardized variability index, SVI) using CPC unified gauge-based analysis of global daily precipitation over 1982–2022.</div></div><div><h3>New hydrological insights for the regions</h3><div>The CI and SVI exhibit a significant decreasing trend across almost the entire QTP, which means the temporal distribution of precipitation has become more \"even\" within a year. Meteorological drought was analyzed using the sc-PDSI and SPEI-12 indices. Both indices indicate that drought has intensified in both the humid regions (southeastern QTP) and arid regions (northern QTP). However, in the transition zone between dry and humid areas, drought conditions have shown signs of alleviation. Analysis of the vegetation indicates a greening trend across the QTP, particularly in the northeastern regions. CI is more superior than the SVI in characterizing vegetation growth, especially in the transitional zones between bare land and grassland where precipitation is sparse. The findings provide a scientific basis for vegetation restoration and drought risk management on the QTP.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"56 ","pages":"Article 102048"},"PeriodicalIF":4.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}