现代水文学期刊(英文)最新文献_第5页

The Replacement of Peridinium by Cyanobacteria in Lake Kinneret (Israel): A Commentary Review 以色列Kinneret湖中蓝藻对Peridinium的替代研究综述

现代水文学期刊(英文) Pub Date : 2019-01-01 DOI: 10.4236/ojmh.2019.94009

M. Gophen

引用次数: 5

The Interpretation of Underground Water Physical Parameters of Housing in the Region of Asahan Indah Palm Oil Factory Area Rokan Hulu District Asahan Indah棕榈油工业区Rokan Hulu地区住宅地下水物性参数解释

现代水文学期刊(英文) Pub Date : 2018-09-14 DOI: 10.4236/ojmh.2018.84009

M. Juandi

{"title":"The Interpretation of Underground Water Physical Parameters of Housing in the Region of Asahan Indah Palm Oil Factory Area Rokan Hulu District","authors":"M. Juandi","doi":"10.4236/ojmh.2018.84009","DOIUrl":"https://doi.org/10.4236/ojmh.2018.84009","url":null,"abstract":"The research has been conducted to analyze the distribution of underground water physical parameters of the housing around Asahan Indah palm oil factory area Rokan Hulu District with radial method within ±300 meters radius from the factory location. The levels of underground water physical parameters include conductivity, resistivity, and salinity measured based on coordinate points amounted of 50 points. The data obtained from the measurement results were then inputted into “surfer 11” software to be processed in order to obtain the contour map of underground water physical parameters level. The results of this research indicated that the highest conductivity level came from the ring well type with 5 meter depth; it was 0.0964 (1/ohm·m) exceeded the standard threshold of underground water quality standard and the lowest conductivity was 0.00342 (1/ohm·m) which came from a ring well type with 10 meter depth. The lowest resistivity level was 10.37 ohm·m which came from the ring well type with 5 meter depth and the highest was 292.4 ohm·m which came from the ring well with 10 meter depth. The highest salinity level was 448 mg/l which exceeded the baseline threshold of underground water quality which came from the ring well type with 5 meter depth and the lowest was 175 mg/l from the ring well with 10 meter depth. The results of this research found that underground water in wells with 5 meters depth has been polluted with palm oil waste and at the depth of 10 meters, it has not been contaminated.","PeriodicalId":70695,"journal":{"name":"现代水文学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49252151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Groundwater Potential Assessment and Characterization of Genale-Dawa River Basin Genale Dawa河流域地下水潜力评价与表征

现代水文学期刊(英文) Pub Date : 2018-09-14 DOI: 10.4236/OJMH.2018.84010

Nebiyou Kassahun, M. Mohamed

引用次数: 8

Generic Method for Merging Satellite and Historical Ground Station Data to Design Rainfall Intensity Duration Frequency (IDF) Curves in Recordless Sub-Saharian Countries 合并卫星和历史地面站数据设计撒哈拉以南无记录国家降雨强度持续频率(IDF)曲线的通用方法

现代水文学期刊(英文) Pub Date : 2018-09-14 DOI: 10.4236/OJMH.2018.84008

J. E. Matos

{"title":"Generic Method for Merging Satellite and Historical Ground Station Data to Design Rainfall Intensity Duration Frequency (IDF) Curves in Recordless Sub-Saharian Countries","authors":"J. E. Matos","doi":"10.4236/OJMH.2018.84008","DOIUrl":"https://doi.org/10.4236/OJMH.2018.84008","url":null,"abstract":"The availability of long-term rainfall records is essential to conduct a serious frequency analysis in order to estimate the effective precipitation depth. The development of the process of elaboration of IDF (Intensity-Duration-Frequency) curves for a given location requires very precise data, at least with daily frequency, obtained through the use of rainfall records. The present study presents a method used to merge historical precipitation data with the latest data collected by satellite in order to perform graphs with IDF curves in places where rainfall records are scarce. The homogeneity of the data used is analyzed in order to guarantee its statistical utility and the frequency analysis was performed with the statistical distributions of Extreme Values Type I (Gumbel), Gamma, Pearson Type III and finally with Log-Pearson Type III, in order to verify which one of them applies better to the sites chosen for this analysis: the cities of Benguela and Lobito in the south of Angola. Daily rainfall data from the TRMM mission and historical daily data were used to derive the relationships between the maximum daily precipitation and the sub-daily precipitation values. From the observed daily data, techniques of disaggregation of the collected data were used, in order to generate a synthetic precipitation sequence with the extreme values in periods of time inferior to the daily one, with statistical properties similar to the registered data. Then IDF equations are established, with which the occasional storm depth is calculated for various return periods and various durations and, after them, the IDF curves are drawn for these two geographic stations.","PeriodicalId":70695,"journal":{"name":"现代水文学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41305650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Detection of Spatial, Temporal and Trend of Meteorological Drought Using Standardized Precipitation Index (SPI) and Effective Drought Index (EDI) in the Upper Tana River Basin, Kenya 基于标准化降水指数(SPI)和有效干旱指数(EDI)的肯尼亚上塔纳河流域气象干旱时空及趋势探测

现代水文学期刊(英文) Pub Date : 2018-07-17 DOI: 10.4236/OJMH.2018.83007

R. Wambua, B. Mutua, J. Raude

{"title":"Detection of Spatial, Temporal and Trend of Meteorological Drought Using Standardized Precipitation Index (SPI) and Effective Drought Index (EDI) in the Upper Tana River Basin, Kenya","authors":"R. Wambua, B. Mutua, J. Raude","doi":"10.4236/OJMH.2018.83007","DOIUrl":"https://doi.org/10.4236/OJMH.2018.83007","url":null,"abstract":"Drought events across the world are increasingly becoming a critical problem owing to its negative effects on water resources. There is need to understand on-site drought characteristics for the purpose of planning mitigation measures. In this paper, meteorological drought episodes on spatial, temporal and trend domains were detected using Standardized Precipitation Index (SPI) and Effective Drought Index (EDI) in the upper Tana River basin. 41 years (1980-2016) monthly precipitation data from eight meteorological stations were used in the study. The SPI and EDI were used for reconstruction of the drought events and used to characterize the spatial, temporal and trend distribution of drought occurrence. Drought frequency was estimated as the ratio of a defined severity to its total number of events. The change in drought events was detected using a non-parametric man-Kendall trend test. The main drought conditions detected by SPI and EDI are severe drought, moderate drought, near normal, moderate wet, very wet and extremely wet conditions. From the results the average drought frequency between 1970 and 2010 for the south-eastern and north-western areas ranged from 12.16 to 14.93 and 3.82 to 6.63 percent respectively. The Mann-Kendall trend test show that drought trend increased in the south-eastern parts of the basin at 90% and 95% significant levels. However, there was no significant trend that was detected in the North-western areas. This is an indication that the south-eastern parts are more drought-prone areas compared to the North-western areas of the upper Tana River basin. Both the SPI and the EDI were effective in detecting the on-set of drought, description of the temporal variability, severity and spatial extent across the basin. It is recommended that the findings be adopted for decision making for drought-early warning systems in the river basin.","PeriodicalId":70695,"journal":{"name":"现代水文学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46738669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Seasonal Partitioning of Primary Production and Biomass between Phytoplankton and Metaphyton in a Shallow Lake Agmon, Hula Valley (Israel) Hula Valley（以色列）Agmon浅水湖浮游植物和Metaphyton初级生产力和生物量的季节分配

现代水文学期刊(英文) Pub Date : 2018-04-04 DOI: 10.4236/OJMH.2018.82006

Y. Yehoshua, M. Gophen

{"title":"Seasonal Partitioning of Primary Production and Biomass between Phytoplankton and Metaphyton in a Shallow Lake Agmon, Hula Valley (Israel)","authors":"Y. Yehoshua, M. Gophen","doi":"10.4236/OJMH.2018.82006","DOIUrl":"https://doi.org/10.4236/OJMH.2018.82006","url":null,"abstract":"Agmon is a small, shallow man-made lake (area: 1.1 km2; mean depth 0.45 m), excavated in the peat soils of the Hula Valley in northern Israel, that was filled with water in August 1994. We followed the seasonal variations in phytoplankton and metaphyton biomass, primary production and related environmental conditions between December 1995 and July 1997. Water temperature ranged between 9.5°C - 30.8°C; pH ranged between 7.2 - 8.6. The algae in Lake Agmon were characterized by seasonal alterations between summer-fall phytoplankton blooms and spring proliferation of benthic algal mats, with a winter clear-water phase. Chlorophyll a content in the water, as a measure of planktonic algal biomass, was low in winter (1.75 - 5 μg·L-1) and high in summer (>100 μg·L-1), when planktonic cyanobacteria (Microcystis spp.) bloomed. Metaphyton biomass varied between 3.5 and 970 g·dry·wt·m-2, with chlorophyll a content ranging from 5 - 701 mg·m-2. The dominant benthic algal genera were Spirogyra and Oedogonium in 1996 and Cladophora in 1997. Phytoplankton primary production was high in summer-fall, with a maximum of 1200 mg·O2·m-2·h-1. Benthic primary production was high from March till May, with a peak of 2173 mg·O2·m-2·h-1 in April 1997. The rate of benthic algal primary production was positively correlated to benthic chlorophyll a (r2 = 0.90). Diel measurements of water column dissolved oxygen (DO) concentration, conducted monthly from January to May 1997, revealed that DO concentration ranged from a nighttime minimum of 5.3 to a noon peak of 15.3 mg·L-1. Only during January to February, no significant changes in DO with depth were found, suggesting that at that time the water column was well mixed. The most salient feature of primary production in the lake was the seasonal partitioning between its benthic and planktonic components. This was most evident in the significant inverse relationship between benthic and planktonic primary productivity rates (r2 = 0.78).","PeriodicalId":70695,"journal":{"name":"现代水文学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42363497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Temperature Impact on the Shannon-Wiener Biodiversity Index (BDI) of Zooplankton in Lake Kinneret (Israel) 温度对以色列Kinneret湖浮游动物Shannon-Wiener生物多样性指数的影响

现代水文学期刊(英文) Pub Date : 2018-04-04 DOI: 10.4236/OJMH.2018.82004

M. Gophen

引用次数: 2

Atmospheric CO 2 Increase: A Potential for Primary Production Enhancement in Lake Kinneret 大气中二氧化碳的增加：Kinneret湖初级生产力提高的潜力

现代水文学期刊(英文) Pub Date : 2018-04-04 DOI: 10.4236/ojmh.2018.82005

M. Gophen

引用次数: 0

Egg Development Time (EDT) in Mesocyclops ogunnus 中圆蝽的卵发育时间(EDT)

现代水文学期刊(英文) Pub Date : 2018-01-19 DOI: 10.4236/ojmh.2018.81003

M. Gophen

引用次数: 0

Reforming Provisional (2007-2008) Sarotherodon galilaeus Landing Decline in Lake Kinneret (Israel) 改革临时(2007-2008)基内雷特湖(以色列)加利利沙罗东登陆数量下降

现代水文学期刊(英文) Pub Date : 2018-01-08 DOI: 10.4236/OJMH.2018.81002

M. Gophen

{"title":"Reforming Provisional (2007-2008) Sarotherodon galilaeus Landing Decline in Lake Kinneret (Israel)","authors":"M. Gophen","doi":"10.4236/OJMH.2018.81002","DOIUrl":"https://doi.org/10.4236/OJMH.2018.81002","url":null,"abstract":"The background for the case analysis of the present paper is the landing decline of Sarotherodon galilaeus during 2007-2008 to the annual level of <10 ton whilst normal harvests varied between 170 and 350 t/y. The objectives of the study are aimed at exploring limnological conditions and fishery management which might be the cause for this case. The research methods are focusing at long-term analysis of entire environmental conditions. The results indicatively highlight that, as other fluctuations of limnological parameters (Plankton, Nutrients) in Lake Kinneret, the fishery decline of S. galilaeus is attributed to normal periodical cyclic trends. Therefore, a recommendation that was submitted as a total fishing ban for three years was strongly opposed. The total fishing ban recommendation was rejected because further demolishing processes within the ecosystem were predicted. This conclusion was justified later (2011-2016) when annual landings came to the normal level. Conclusive recommendations considered that the fishing ban was indicated as “Ecological Disorder” and its replacement by controlled fishing policy as “Order Policy” was successfully implemented.","PeriodicalId":70695,"journal":{"name":"现代水文学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46486173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3