River Discharge Derived of Lijiang River Basin Based on Sentinel-1 SAR Data by CHEN Siyu, LI Jiqing, XIE Yutao, TIAN Yu

“…It is divided into 8 river sections, and the river discharge datafrom three corresponding hydrological stations of Darong River, Guilin and Yangshuo are used forone-dimensional regression analysis to establish the average river width-discharge regressionequation. …”
Get full text

Response Characteristics of Steppe Inland River Basins under Climate Change and Its Impact on Runoff from 1982—2020 by CHEN Hongguang, MENG Fanhao, SA Chula, LUO Min, WANG Mulan

“…Based on hydro-meteorological data and normalized difference vegetation index (NDVI) from 1982 to 2020,this paper studies the Wulagai River basin in Inner Mongolia and analyzes the vegetation response characteristics of the basin under climate change and its impact on runoff by adopting a hydrological model of soil and water assessment tool (SWAT) and statistical analysis method.The results show that the SWAT model has good applicability in the basin.The Nash-Sutcliffe efficiency coefficient (NSE) and coefficient of determination (R²) are larger than 0.62 in both regular and validation periods,and the relative error (PBLAS) is less than 18.8%.In the last 40 years,precipitation in the basin decreased slowly at a rate of 8.9 mm/10a,while temperature and actual evapotranspiration increased at a rate of 0.43°C/10a and 2.8 mm/10a,respectively,which indicates that the basin is becoming warm and dry.As the basin climate gets warm and dry,the vegetation recovers and grows vigorously.As a result,climate change and vegetation recovery lead to a reduced runoff depth of the basin.The study results can provide a reference for ecological conservation and sustainable utilization of water resources of inland river basins in arid and semi-arid regions.…”
Get full text

Study on the Water Volume of Erhai Lake in Yunnan Plateau by LI Hongyan

“…Based on the monitoring results of hydrological factors such as measured discharge,precipitation,evaporation and outflow in the Erhai Lake Basin from 1956 to 2018,this paper calculates the natural water volume of the Erhai Lake by using two related methods,namely the principle of watershed generation and convergence and the water balance,and studies the trend and periodicity of natural water volume in Erhai Lake over the years through the Manner-Kendall method and wavelet analysis method.The results show that:The natural water volume calculated by the two methods in Erhai Lake for many years is relatively close,with the relative error of 0.5%,that is 851.9 million cubic meters,among which the water production in the lake area is -93.2 million cubic meters,and the water volume of the land is 944.9 million cubic meters (north (a)>west (b)>southeast (c)>east (d),accounting for 54.9%,33.2%,6.9%,and 4.9% of the land water volume,respectively);The natural water volume in the Erhai Lake throughout the year,the flood season,and the dry season show a decreasing trend with time,especially in the flood season;There are periodic changes in the water volume around 9,12,21,and 32 a,which led to the trend of rich and dry changes in the natural water volume of Erhai Lake.…”
Get full text

Ground Water Quality Determination of former Lake Haramaya, Haramaya District, Eastern Haranghe Zone, Oroma Regional State, Ethiopia by Zinabu Tebeje Zewdu

“…In order to determine the basic hydrologic parameters, meteorological data was collected from Haramaya meteorological station. …”
Get full text

L’introduction de la notion de service environnemental et écosystémique à Madagascar by Fano Andriamahefazafy, Cécile Bidaud, Philippe Méral, Georges Serpantié, Aurélie Toillier

“…Several steps are identified through a historical analysis: (1) End of the 90s: exploratory research on the total value of the forest products (academic research, forest administration, donors). (2) 2000-2004: advanced research with studies of economists dedicated to the sustainable financing and to the extension of the network of protected areas. (3) From 2004: implementation of PSE, by order of importance: carbon sequestration, hydrological services, preservation of the biodiversity. …”
Get full text

Stochastic process-based drought monitoring and assessment system: A temporal switched weights approach for accurate and precise drought determination. by Muhammad Asif Khan, Sergey Barykin, Dmitry Karpov, Nikita Lukashevich, Akram Ochilov, Rizwan Munir

“…As a result, a novel system for meteorological, agricultural, and hydrological droughts based on the Stochastic Process (Markov chain (MC)) has been proposed to address this issue. …”
Get full text

Analysis of Variation Characteristics of Precipitation Series from 1970 to 2019 in Qingyuan City by LIU Xuanxuan

“…In order to understand the variation characteristics of precipitation in Qingyuan City in recent decades,and realize the scientific management and utilization of water resources,based on the measured precipitation data of six representative hydrologic stations in Qingyuan from 1970 to 2019,this paper analyzes and studies the trend change,sudden change and periodic characteristics of annual precipitation in Qingyuan by moving average method,Mann-Kendall test method and Morlet wavelet analysis method.The results show that:The annual precipitation of Qingyuan Station and Zhukeng Station showed a decreasing trend,while that of Damiaoxia Station,Yingde Station,Yangshan Station and Lianxian Station showed an increasing trend,but the change was not significant.The sudden drop occurred around 1975 for Qingyuan Station and Yingde Station,around 2015 for Damiaoxia Station and Lianxian Station,around 1982 for Zhukeng Station.and around 1973 and 2015 for Yangshan Station.The precipitation series of each station has obvious alternation of wet and dry seasons.There are 3 to 4 main periods of precipitation at each station.The first and second main periods are generally 22 or 15 years,and the third and fourth main periods are generally 7 or 3 years.After 2015,the annual precipitation at each station turned into a decreasing trend.Currently,Qingyuan is in a period of low precipitation.…”
Get full text

The thermal evaluation of snow line and identification of potential areas of snow falling in the Alborz Mountains with NOAA-AVHRR images by Dariush Yarahmadi, Amanolah fathnia, Mehdi Sherafat

“…Abstract The extention of Snow cover and its spatial and temporal changes considered as a basic parameter in climatic and hydrologic studies. Data from satellite images due to the low cost and the large extention of cover are, effectively help the identifying of the snowy basins. …”
Get full text

Numerical Simulation of the Effect of Long-Term Reclamation on the Flow and Sediment Concentration in Binhai Port,Yancheng by ZHU Siyu, LU Dan

“…Binhai Port is located at the most obvious corrosive coastline of the abandoned Yellow River delta in the north of Jiangsu Province,where the near-shore wave and flow dynamic is strong,the sediment movement is relatively active,the underwater terrain is complex and the slope erosion is obvious.Based on the measured hydrological and sediment data and a two-dimensional mathematical model for wave,tidal current and sediment,this paper quantitatively analyzes the influence of the long-term reclamation project on the flow and sediment concentration in the study area and the surrounding estuary,and emphatically discusses the back silting characteristics and deposition causes of the 300 000-ton channel during normal and rough weather.The results show that:After the implementation of the reclamation project,the flow and sediment characteristics of the study area don't change in a large scale,and mainly the flow and sediment near the project site is affected.The sediment is deposited after the channel dredging and a sediment deposit centered at the area with peak sediment concentration is formed in the channel,with decreasing deposition thickness to the port and outer sea channel.During rough weather,the maximum deposition thickness can reach 8~24 times of that in normal weather,but it is less than 0.2 m/d and there is no sudden silting and navigation blocking.…”
Get full text

Institutions, Voids, and Dependencies: Tracing the Designs and Robustness of Urban Water Systems by Aaron Deslatte, Elizabeth A. Koebele, Lauren Bartels, Adam Wiechman, Sara Alonso Vicario, Celeste Coughlin, Desi Rybolt

“…Responding to these challenges in complex socio-environmental systems (SES) requires integrating various types of information – ranging from hydrologic data to political considerations and beyond – into policy and management decisions. …”
Get full text

MOŽNOSTI POSUZOVÁNÍ EFEKTIVITY INVESTIC DO MODRO-ZELENÉ INFRASTRUKTURY V URBANIZOVANÉM ÚZEMÍ by Jan Kopp, Pavlína Hejduková, Michaela Hejplíková

“…Based on the calculations for the model area, differences in the evaluation of different elements of the blue-green infrastructure are demonstrated with regard to their price, hydrological function and other benefits for the urbanized area. …”

Medium- and Long-term Runoff Prediction Based on SMA-LSSVM by TIAN Jinghuan, LI Congxin, LI Ang

“…Medium-and long-term runoff prediction is extremely important for flood control,disaster reduction and the utilization efficiency improvement of water resources.To avoid the influence of prediction model parameters on prediction accuracy,this paper proposes a medium-and long-term runoff prediction model based on least squares support vector machine (LSSVM) optimized by the slime mold algorithm (SMA).Firstly,five standard test functions are selected to compare the simulation results of SMA and particle swarm optimization (PSO) algorithms in different dimensions.Secondly,SMA is used to optimize the penalty parameters and kernel parameters of LSSVM,and the comparison models of LSSVM and PSO-LSSVM are constructed.Finally,the models are verified with the monthly runoff of Manwan Hydropower Station Reservoir and Yingluoxia Hydrological Station as prediction examples.The results show that the mean square error of the SMA-LSSVM model is 29.26% and 7.42% lower than those of the LSSVM and PSO-LSSVM models,respectively,in the monthly runoff prediction of the Manwan station,and 32.61% and 6.61% lower,respectively,in the monthly runoff prediction of the Yingluoxia station.The proposed SMA-LSSVM model has better comprehensive prediction performance and also provides a new method for medium- and long-term runoff prediction.…”
Get full text

The Role of Atmospheric Blocking in Regulating Arctic Warming by Cheng You, Michael Tjernström, Abhay Devasthale, Daniel Steinfeld

Get full text

Ecosystem Processes and Nitrogen Export in Northern U.S. Watersheds by Robert Stottlemyer

“…The most important appear to be seasonal change in hydrologic flowpath, soil freezing, seasonal forest-floor inorganic N pools resulting from over-winter mineralization beneath the snowpack, spatial variation in watershed forest-floor inorganic N pools, the degree to which snowmelt percolates soils, and gross soil N mineralization rates.…”
Get full text

Ground Water Quality Determination of former Lake Haramaya, Haramaya District, Eastern Haranghe Zone, Oroma Regional State, Ethiopia by Zinabu Tebeje Zewdu

“…In order to determine the basic hydrologic parameters, meteorological data was collected from Haramaya meteorological station. …”
Get full text

Modeling Spatiotemporal Precipitation: Effects of Density, Interpolation, and Land Use Distribution by Christopher L. Shope, Ganga Ram Maharjan

“…The gauge network is a key driver in hydrologic modeling to characterize discharge. The accuracy of precipitation is dependent on the location of stations, the density of the network, and the interpolation scheme. …”
Get full text

Spatial Distribution of Nitrogen on Grazed Karst Landscapes by Douglas G. Boyer, Ghiath A. Alloush

“…Distribution of soil NO3-N and NH4-N were related to frequency of animal presence and to topographic and hydrologic redistribution of soil and fecal matter in the grazed sinkholes. …”
Get full text

Study on Spatio-Temporal Variation of Runoff in Flood Season in Hanjiang River Basin by WANG Dong, WU Dongdong, XIE Xiaobai, LI Xuehui

“…Based on the average daily flow data of five typical hydrologic stations from 1956 to2016 in the Hanjiang River Basin, this paper analyzes the spatio-temporal vibrationcharacteristics of runoff in flood season by means of mathematical statistics, establishes the VICmodel applicable to Hanjiang River Basin according to the hydrometeorological data, DEM, soil typeand vegetation cover data, and analyzes the spatial distribution characteristics of runoff inflood season based on runoff simulation results of the VIC model. …”
Get full text

Correction of TRMM 3B42V7 Based on Linear Regression Models over China by Shaohua Liu, Denghua Yan, Tianling Qin, Baisha Weng, Meng Li

“…High temporal-spatial precipitation is necessary for hydrological simulation and water resource management, and remotely sensed precipitation products (RSPPs) play a key role in supporting high temporal-spatial precipitation, especially in sparse gauge regions. …”
Get full text

Short-Term Response of Instream Habitats and Brown Trout (<i>Salmo trutta</i>) Populations to Habitat Rehabilitation in Two Trout Streams, Minnesota, USA by Neal D. Mundahl

“…Significant increases in certain types of fish cover (overhanging banks, mid-channel boulders, and deep water) were observed immediately after rehabilitation in one or both streams, whereas improved channel dimensions (narrower and deeper) and hydrologic variables (higher current velocities) were less likely to be realized in the short term (1 to 4 years). …”
Get full text