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1.
B. Czeczuga 《洁净——土壤、空气、水》1991,19(5):517-528
The work was undertaken to investigate the mycoflora of the river W?gorapa and its tributary, the river Goldapa-Jarka. Samples of water were collected in two years (1987-1988) for hydrochemical analysis and studies of the content. Thirty-seven species of fungi were found in these rivers. The following fungi, which had been unknown in Poland, were found in these rivers: Hapalopera fragilariae, Rhizophlyctis petersenii, Olpidiopsis vexans, Aphanomyces ovidestruens and Pythium inflatum. 相似文献
2.
Zoosporic aquatic fungi growing on dead specimens of 29 freshwater crustacean species 总被引：1，自引：0，他引：1
The authors investigated aquatic fungi growing on the carapaces of 29 species of dead crustaceans (13 species of Copepoda, 13 species of Cladocera and 3 species of Ostracoda) in the water from six limnological and trophical different water bodies (two springs, one river, one lake and two ponds). All of these waterbodies are strongly loaded. 146 species of aquatic fungi were found on the carapaces: 40 Chytridiomycetes, 1 Hyphochytriomycete and 105 Oomycetes. The most common fungus species were Karlingia chitinophila, Myzocytium microsporum, Myzocytium zoophthorum, Pythium acanthicum, Pythium butleri and Pythium myriotylum. Most zoosporic fungus species were observed on the specimens of Daphnia pulex (50 fungus species), Daphnia magna (48) and Cyclocypris laevis (44), fewest on Cyclops fuscus and Cyclops vicinus (each 10).The most fungi were growing in the water from River Supraśl (86), the fewest in the water from Pond Fosa (53). Cluster analysis of the investigated parameters carried out in water bodies during the experiment on zoosporic fungus species has revealed that in the water from springs and Pond Fosa the number of fungus species is closely associated with the concentration of sulphates, in water from River Supraśl and Lake Komosa with calcium and in the water from Pond Dojlidy with chlorides. Out of these 146 species, 21 are known as parasites or necrotrophs of fish. Some dead specimens of crustacean species are a new substrate for some fungus species. 相似文献
3.
Temporal variation of river flow renewability in the middle Yellow River and the influencing factors
Jiongxin Xu 《水文研究》2005,19(9):1871-1882
In the past 30 years, the measured annual river flow of the Yellow River has declined significantly. After adding the diverted water back to get the ‘natural’ annual river flow, the tendency of decrease can still be seen. This indicates that the river flow renewability of the Yellow River has changed. The river flow renewability is indexed as the ratio of annual ‘natural’ river flow to annual precipitation over a river drainage basin, where the ‘natural’ river flow is the measured annual river flow plus the annual ‘net’ water diversion from the river. By using this index, based on the data from the drainage area between Hekouzhen and Longmen stations on the middle Yellow River, a study has been made of the river flow renewability of the Yellow River in the changing environment of the past 50 years. The river flow renewability index (Irr) in the drainage area between Hekouzhen and Longmen in the middle Yellow River basin has been found to decline significantly with time. In the meantime, annual precipitation decreased, annual air temperature increased, but the area of water and soil conservation measures has been increased. It has been found that Irr is positively correlated with the areal averaged annual precipitation, but negatively correlated with annual air temperature. There is close, negative correlation between Irr and the area of water and soil conservation measures including land terracing, tree and grass planting and checkdam building, implying that water and soil conservation measures have reduced the river flow renewability. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
4.
The Vistula (Wisla) river, the biggest river in Poland, is 1038 km long and has a drainage area of 168 689 km2. The river is strongly polluted by wastewaters. Big industrial plants are situated mainly in the upper part of the river, where it is slow‐flowing. This paper presents the results of the analysis of bottom sediment samples gathered from different locations along the Vistula river, from Kraków to Gdansk. The study was conducted in 2005. The following parameters were determined: chloroorganic pesticides, polychlorinated biphenyls (PCBs), chlorophenols, polycyclic aromatic hydrocarbons (PAHs), total organic carbon (TOC). The sum of chloroorganic pesticides was in the range of 2.0 to 77.5 ng/g d.w. (dry wet) with the highest values in the upper part of the river. p,p′‐DDT was found in the highest concentration. The sum of PCBs was in the range of 0.9 to 64.2 ng/g d.w. The sum of chlorophenols varied from 0.48 to 14.3 ng/g d.w. 2,4‐Dichlorophenol and pentachlorophenol occurred in the highest concentration. The sum of PAHs was in the range of 1552 to 7832 ng/g d.w. Phenantren was found in the highest concentration and antracen in the lowest. TOC values varied from 4.3 to 43.9 g/kg d.w. The concentrations of pesticides and PCBs were the highest in the upper part of the river and decreased along the course of the river, but the other determined compounds did not show this trend. However, the highest values occurred always in the upper part of the river. 相似文献
5.
This paper reports changes in dissolved organic carbon concentration β(DOC) and the relation between UV-active and non-UV-active components determined for Elbe river water and river bank infiltrate in the Torgau river basin between 1992 and 1994. Using an ultrafiltration method, the fractionation of the DOC content was obtained for the fractions > 10 000 g/mol, 1 000…10 000 g/mol, and < 1 000 g/mol. The spectral absorption coefficient at 254 nm a254 of the molecular-weight fractions was also measured. The mean total DOC concentration of Elbe river water decreased from 6.0 mg/L to below 3.9 mg/L along two investigated flowpaths. Two thirds of the decrease occurred within the first few metres of the river bed and one third along the 350 m length of the groundwater flowpaths. The a254 values showed a significant decrease from 14.8 1/m in Elbe river water to 7.8 1/m in the aquifer. Along a flowpath, the proportion of low-molecular weight fraction of DOC increased, the proportion of high-molecular weight fraction decreased, and the proportion of the 1 000…10 000 g/mol molecular-weight fraction remained relatively stable. The Elbe river water contained the main portion of UV-active compounds in the fraction 1 000…10 000 g/mol, and this was also the case for samples of river infiltrate. For the high-molecular weight fraction, mainly non-UV-active compounds were attenuated in the river bed sediment. 相似文献
6.
鱼类过坝后的上溯行为对鱼类寻找适宜的产卵、索饵等功能性栖息地至关重要。现阶段我国大多数研究聚焦于鱼类上溯通过鱼道的游泳行为量化,而过坝后的上溯行为分析鲜有报道。本研究在金沙江下游支流黑水河松新坝址处利用PIT(passive integrated transponder)遥测技术对松新电站过鱼对象短须裂腹鱼(Schizothorax wangchiachii)过坝后的上溯行为开展监测,考虑监测过程中水文情势变化对过坝后上溯行为的影响,采用生存分析方法,构建了耦合多因素(流量、水温、河道涨落水率、昼夜节律、肥满度等)的Cox风险比例回归模型,利用AIC模型准则筛选出最优模型参数,识别了影响鱼类过坝后上溯成功率的关键因素。结果表明:(1)短须裂腹鱼在松新鱼道的上溯效果显著优于河道;(2)水温及河道涨落率是影响短须裂腹鱼过坝后上溯效果的关键因素;(3)水温与短须裂腹鱼过坝后河道上溯成功率呈负相关,当水温超过短须裂腹鱼最适温度后,河道上溯成功率随着温度的上升呈递减趋势;河道涨落水率与短须裂腹鱼过坝后河道上溯成功率呈正相关,其中涨水情势下短须裂腹鱼河道成功上溯的概率高于落水,河道上溯成功率随着涨... 相似文献
7.
于2018年68月在长江下游菜子湖流域沿岸带、敞水区、湖口和河道4种典型微生境分别设置样点进行鱼类调查,探讨生境过滤对鱼类物种和功能组成的影响.共采集鱼类5目31属43种,其中沿岸带湖泊定居性、山溪河流性及江湖洄游性鱼类物种数均较低,河道山溪河流性鱼类物种数较高.通过对各微生境间物种组成的差异分析,显示出4种微生境条件下的鱼类群落均有显著差异,且沿岸带、敞水区和河道的代表种分别为、鳙、草鱼、鲢,华鳈、光唇蛇鮈、蛇鮈.通过单因素多元方差分析解析不同生境过滤条件下鱼类物种和功能多样性的差异,发现在物种多样性层面,沿岸带的Richness指数和Shannon-Wiener指数显著低于其他微生境;在功能多样性层面,不仅发现沿岸带显著较低的RaoQ指数,同时发现河道的FDiv指数显著高于其他微生境类型. 相似文献
8.
梯级小水电的开发一定程度上破坏了河流连通性并阻碍了鱼类洄游通道。黑水河流域松新坝址为了满足鱼类上行产卵修建了松新鱼道,然而作为洄游物种生命周期中的关键行为,鱼类下行洄游的需求也同等重要。为了寻求一种可行、高效、低损伤的下行过鱼方式,了解河流中不同环境因素对鱼类下行效率的影响,本研究在金沙江下游支流黑水河松新水电站补水通道开展鱼类下行过坝效果评估研究。针对两种鲤科鱼类(棒花鱼Abbottina rivularis和短须裂腹鱼Schizothorax wangchiachii)幼鱼和两种鳅科鱼类(短体副鳅Paracobitis potanini和红尾副鳅Paracobitis variegatus)幼鱼各放鱼90尾,定量分析鱼种、水体透明度、放鱼位置、流量、水温、水位等因素对鱼类下行效率的影响。结果表明:棒花鱼、短须裂腹鱼、短体副鳅、红尾副鳅的下行率依次为22.22%(20尾)、28.89%(26尾)、8.89%(8尾)、15.56%(14尾);幼鱼下行成功率与上游河道水温呈正相关趋势,且放鱼位置、鱼种、上游河道水温和流量均对鱼类下行成功率有显著影响。通过构建二元Logistic回归模型识... 相似文献
9.
黑河张掖段浮游植物群落结构及其与环境因子的关系 总被引：3，自引：2，他引：1
为探究黑河张掖段浮游植物群落季节动态及其与环境因子的相互关系,于2017年对黑河张掖段10个断面进行4个季度的采样调查,共计检出浮游植物8门80属316种,其中蓝藻门、绿藻门和硅藻门种类分别占总种类数的10.75%、15.22%和68.35%.水环境因子中,温度、电导率、盐度、溶解氧和叶绿素a浓度时空变化显著,总氮、总磷浓度则随着海拔降低而呈现显著升高的趋势.调查期间,黑河张掖段浮游植物密度在0.92×104~116.67×104 cells/L之间,从上游到下游呈现明显的递增趋势.优势种主要集中在硅藻门,包括扇形藻（Meridion sp.）、弧形峨眉藻（Ceratoneis arcus）、极小曲壳藻（Achnanthes minutissimum）、延长等片藻细弱变种（Diatoma elongatum var.tenuis）、尖针杆藻（Synedra acus）、简单舟形藻（Navicula simplex）、谷皮菱形藻（Nitzschia palea）、变异直链藻（Melosira varians）、普通等片藻（Diatoma vulgaris）、肘状针杆藻（Synedra ulna）等,此外,在河段优势种中,中下游出现蓝藻门的微囊藻（Microcystis sp.）（优势度为0.025）、绿藻门的四尾栅藻（Scenedesmus quadricauda）（优势度为0.020）、隐藻门的尖尾蓝隐藻（Chroomonas acuta）和卵形隐藻（Cryptomonas ovata）（优势度为分别为0.045和0.032）种类.4个季度Shannon-Wiener多样性指数（H''）均值分别为2.65、2.76、2.89和2.44,Pielou均匀度指数（E）均值为0.93、0.90、0.91和0.87,Margalef丰富度指数（d）均值为1.73、1.77、2.00和1.31.随着海拔的降低,浮游植物H''和d显著升高,而E变化范围相对平稳.结合水体营养盐指标、浮游植物及多样性指数等指标对水质评价,黑河张掖段水质总体呈无污染或轻度污染到轻中度污染状态,且中游污染程度加剧.RDA与Pearson相关性分析结果表明,水体氮磷营养盐、温度、海拔是影响黑河张掖段浮游植物群落结构及动态的关键因素,而在河段下游,电导率、盐度也是影响浮游植物群落结构的主要环境因子. 相似文献
10.
To compare the impacts of river discharge on the surface water quality of the Xiangjiang River in China, 12 surface water quality parameters recorded at 31 sampling sites from January 1998 to December 2008 along the river and its main tributaries were analyzed. Significantly higher concentrations of total nitrogen, ammoniacal nitrogen, and total phosphorus, and biochemical oxygen demand were observed during low‐flow periods than during high‐flow periods, implying a higher risk to local residents drinking untreated water during low‐flow periods. Pollution indexes, including the inorganic pollution index and integrated pollution index (IPI), were negatively related to impervious surface area (ISA) and cropland area (CLA) when ISA (CLA) was less than 160 (3000) km2. However, the relationship was positive when ISA (CLA) was larger than 160 (3000) km2, which provided a reasonable explanation for the observed spatial patterns of water quality. Distinct increasing temporal trends for two kinds of pollution indexes were also found. The annual ISA was significantly related to the rapid degradation of water quality from 1998 to 2008, with correlation coefficient (r) values of 0.816 (p = 0.002) and 0.711 (p = 0.014) for the organic pollution index (OPI) and IPI, respectively. However, annual rainfall was negatively correlated with the two indexes with r values of 0.785 (p = 0.002) and 0.448 (p = 0.093) for OPI and IPI, respectively. Our study highlights that decision makers should be more aware of recent increases in the pollution of the Xiangjiang River, especially at downriver sites and during low‐flow periods. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
11.
An ultrafiltration methodology and the results of its application on Elbe river water are presented. Compared with other methods, Ultrafiltration allows fractionation of the molecular-weight fractions of DOC for higher volumes of solution in a shorter time. To characterize the molecular-weight fractions, the sum parameter DOC (β(DOC)) and the absorption coefficient at 254 nm a254 were measured, together with determination of a254/ β(DOC) for further characterization of the DOC fractions and to provide information about changes in parts of the UV-active substances of the total dissolved organic material. In the period May 1992 to November 1994, the DOC molecular-weight composition of 65 samples of Elbe river water were determined. At two sampling locations (Torgau-East and Meissen), the DOC content β(DOC) was approximately 6 mg/L. The high-molecular weight fraction (> 10000 g/mol) gave a mean of 13% of the total DOC content β0(DOC). The measurements showed that the molecular composition of DOC in the Elbe does not greatly differ. There was also no clear seasonal influence on the molecular-weight composition of the DOC content. During the period of investigation, the percentage part of β(DOC) and a254/β(DOC) of the high-molecular weight fraction of the total dissolved organic material increased, while the a254/β(DOC) values of the middle molecular-weight fraction remained fairly constant. The dependence of β(DOC) on discharge of the Elbe river is low. Changes in molecularweight composition of DOC were only observed during the steepest increase in river discharge during a flood event, with another spectrum of substances responsible for the increase in β(DOC) when compared with the β(DOC) for low or middle water level. 相似文献
12.
Principles of typification and zoning of river mouth areas are discussed. Definitions of such notions as river mouth area, river mouth, delta, estuary, mouth reach of the river, andnear-shore zone of the river mouth are specified. 相似文献
13.
The rigin and fate of six phthalate esters (dimethyl phthalate (DMP), diethyl phthalate (DEP), di‐n‐butyl phthalate (DnBP), butyl benzyl phthalate (BBP), di (2‐ethylhexyl) phthalate (DEHP) and di‐n‐octyl phthalate (DnOP)), were investigated during 2005 and 2006 in the densely populated Seine river estuary. Four compounds, DMP, DEP, DnBP and DEHP were detected at all the stations with DEHP (160–314 ng L?1), followed by DEP (71–181 ng L?1) and next DnBP (67–319 ng L?1), except at la Bouille, where DnBP was the second most important compound. BBP and DnOP concentrations remained low and were not found at all the stations. Considering all six phthalates, Caudebec‐en‐Caux (beginning of the salinity gradient) was the least polluted station (464 ng L?1), whereas Honfleur (771 ng L?1) and La Bouille (716 ng L?1) displayed the highest contamination levels, probably related to important industrial plants. From Caudebec‐en‐Caux to Honfleur (maximum turbidity), variation of DEHP concentration was related to that of suspended matter. In addition, the salinity rise in that area might have facilitated DEHP sorption upon particles. A significant correlation between flow magnitude and DEHP concentration was found (P < 0·01, n = 12), supporting the influence of the hydrological cycle upon contamination. Runoff contribution (56·9 kg d?1) to river contamination was confirmed by the annual evolution of phthalate concentrations in the Seine river at Poses. Concentrations of DEHP in the tributaries were in the same range as those of the Seine River (100–350 ng L?1), except for two in densely populated and industrialized areas: Robec (800 ng L?1) and Cailly (970 ng L?1). The treatment plant discharge fluxes were in the same range as those of tributaries (30·4–250 g d?1). During high flow periods, the influence of tributaries and of treatment plants seemed to play a minor part in the contamination level of the Seine river estuary. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
14.
Frankie Thielen Uwe Weibel Jürgen Hirt Marcel Münderle Michael Marten Horst Taraschewski Bernd Sures 《Limnologica》2008,38(1):76-85
The fish fauna in the northern part of the upper river Rhine close to the city of Karlsruhe (Germany) was analyzed by collecting fish from the cooling-water intake of a power plant (impingement method) between 1989 and 2001. With this method a total of 36 fish species were recorded. The results were compared between the years as well as with other studies on the fish fauna in this area. Particularly with regard to the physical structure of the river bed and banks, the pre-technical situation of the river Rhine has not been restored. However, the number of fish species has been augmented since the 1970s mainly due to improvements in the water quality and almost all autochthonous fish species are present again. Altogether only three introduced fish species (Sander lucioperca L., Lepomis gibbosus L., and Carassius auratus gibelio were found in this study. Among the long-distance migrating species three freshwater spawners (Lampetra fluviatilis, Petromyzon marinus and Salmo trutta trutta) were detected in addition to the catadromous eel. The eudominant fish species varied between years, i.e. the European eel, Anguilla anguilla, was the eudominant species 1989, whereas this species occurred in much lower numbers during the subsequent sampling campaigns. This clearly indicates that the high dominance of eels is mainly caused by stocking activities in the upper Rhine. In the following years roach, Rutilus rutilus was the eudominant fish species. Overall a positive development of the fish fauna in the upper Rhine over the last 15 years could be observed in terms of fish populations as well as in terms of species richness. 相似文献
15.
16.
Panagiotis Karanis Ioannis Chronis George Zakas Christina Kourenti Isaia Sotiriadou Chrissanthy Papadopoulou 《洁净——土壤、空气、水》2005,33(4):346-354
The objective of the present survey was to assess the microbiological quality of river waters used mainly to irrigate the large plains of Macedonia and Thessaly in Northern Greece. Five rivers (Aliakmonas, Axios, Loudias, Mavroneri and Pineios) were sampled during a 10‐month period (June 2002 – March 2003) for Total Microbial Flora (TMF) at 22 °C and 37 °C, Total Coliforms (TC), Fecal Coliforms (FC), enterococci, staphylococci, Pseudomonas, fungi, Giardia spp. and Cryptosporidium spp. The results indicate moderate to high microbiological pollution, with the highest levels of microbial pollution found in Mavroneri and Pineios Rivers, and moderate pollution levels in Aliakmonas, Axios and Loudias Rivers. The extent of microbiological pollution is accentuated by the fact that Giardia‐ and/or Cryptosporidium cysts were detected in nine out of eleven samples collected in June 2002 with excessive Giardia counts demonstrated for Pineios River. The microbiological pollution of the surveyed rivers is attributed to various degrees of human interference and to lack of ample pollution monitoring systems, which emphasize the need for implementation of the EU Water Framework Directive. 相似文献
17.
Jiongxin Xu 《地球表面变化过程与地形》2019,44(5):1050-1063
Rivers are closely related to climate, and the hydrogeomorphic features and stability of river channels respond sensitively to climatic change. However, the history of instrumental observations of climatic, hydrological and channel changes is short, notably limiting our ability to understand the complex river responses to long-term climate change and human activity. In this study, we show that cave stalagmite records reflected the variations in precipitation and temperature in the Yellow River basin, and the net primary productivity (NPP) of vegetation over the past 1800 years can therefore be reconstructed. We found that the reconstructed annual mean precipitation (Pm) and NPP closely related to the 1800-year variation of the lower Yellow River (LYR) channel instability indexed by the frequency of the LYR levee breaching events (LBEs) (Fb) derived from historical documents. The temporal variations in Pm, NPP and Fb exhibited an anti-phase relationship (negative correlation) and in-phase relationship (positive correlation), referred to as Type I and Type II relationships, respectively. The two types alternately appeared, dividing the studied period into several sub-periods. Type I occurred when the vegetation remained in a quasi-natural condition, and Type II occurred when the vegetation had been altered by humans to some degree. These features reflect complex river behaviours in response to climate change and human activity and may be explained by the interaction between climate, vegetation and human activity on the millennial timescale. © 2018 John Wiley & Sons, Ltd. 相似文献
18.
A total of 331 male and 237 female individuals of the Ganga river prawn, Macrobrachium birmanicum choprai (TIWARI), were examined to establish relationship between its length and weight. The individuals of both the sexes were placed separately in different size groups. When plotted against corresponding values of weight, the average length computed for each size group exhibited an exponential relationship. However, the logarithimic values of observed lengths when plotted against corresponding values of weight exhibited a linear relationship. Correlation coefficient values for both the sexes were found highly significant (r = 0.9846 for males and 0.9762 for females). 相似文献
19.
长江的生物多样性危机——水利工程是祸首,酷渔乱捕是帮凶 总被引：6，自引：3，他引：3
长江是我国第一大河流,全长达6300 km.长江是一条生命之河,它的活力来自于干流、支流、湖泊和湿地的血脉沟通形成的独特生命系统.长江流域是世界生物多样性的热点区域,分布有鱼类400余种,其中纯淡水鱼类350种左右,特有鱼类多达156种.长江中下游是东亚季风气候下形成的洪泛平原区域,湖泊星罗棋布,并与江河相连,生活有珍稀水生哺乳动物——白鱀豚和江豚.1980s初中下游湖泊面积约有23123 km~2.1950—1970年间,沿江大建闸节制,除鄱阳湖(2933 km~2)和洞庭湖(2625 km~2)等外,绝大多数湖泊失去了与长江的自然联系,江湖阻隔使支撑长江鱼类的有效湖泊面积减少了76%.1981年,长江上建成了第一个大坝——葛洲坝;2003年,三峡大坝开始蓄水.长江干流的渔业捕捞量从1954年的43万t下降到1980s的20万t,最后到2011年的8万t(降幅为81%).与此完全不同的是,1950s以来,洞庭湖和鄱阳湖的渔产量分别在2~4万t之间徘徊.长江干流的饵料生物丰度不足两湖的1/7,因此干流对物种的承载力十分有限,以鱼为生的白鱀豚和江豚种群的衰退属于情理之中,加上酷捕误杀,白鱀豚已经灭绝,江豚也危在旦夕.葛洲坝的建设阻挡了鲟鱼和胭脂鱼等的生殖洄游通道,中华鲟和白鲟的灭绝已近在咫尺.长江上游建有1万多座水坝,大部分鱼类的生存受到威胁.根据对长江生物多样性危机成因的粗略估算,节制闸和水电站等水利工程"贡献"了70%,酷渔乱捕等其它因素"贡献"了30%.所谓的生态调度、鱼道或人工放流等也难以拯救膏肓之疾,即使在长江干流十年禁渔也难有根本改观.如果鄱阳湖和洞庭湖相继建闸,将使长江中下游的渔业资源量进一步衰退,江豚的灭绝在所难免,其它物种的灭绝将难以预料.长江在哭泣,众多的物种需要生态文明的呵护! 相似文献
20.
Aysha Akter 《水文科学杂志》2013,58(2):326-343
Abstract Environmental flows have scarcely been considered in river water management in Bangladesh. This study attempts to assess the environmental flow requirements in the Halda River, Bangladesh. Thus, the objectives are to estimate the Halda River flow with different return periods/probabilities, which was done using the log-Pearson Type III distribution (LPIII), and to mitigate the environmental problems in the Halda River using the building block method. The LPIII distribution was used to estimate the expected extreme and satisfactory flows for fish habitat at Panchpukuria station and the expected extreme water levels at Panchpukuria, Narayanhat, Telpari and Enayethat stations. It was found that floods are likely to occur at least once in 2.1, 1.02, 1.75 and 1.25 years at Panchpukuria, Narayanhat, Telpari and Enayethat stations, respectively. The results of flow and water quality analyses suggest that environmental flow requirements cannot be achieved in this river throughout the year. The environmental flow requirements and conservation of fish resources can be achieved by implementing the suggestions provided in conjunction with a comprehensive awareness programme, investigations and trade-off analyses being among the suggestions. Editor Z.W. Kundzewicz; Associate editor B. Sivakumar Citation Akter, A. and Ali, Md. H., 2012. Environmental flow requirements assessment in the Halda River, Bangladesh. Hydrological Sciences Journal, 57 (2), 326–343. 相似文献