Hydrodynamics Simulation Study on Dian Lake Ecosystem

2011 ◽  
Vol 255-260 ◽  
pp. 2673-2680
Author(s):  
Hao Liang Cheng ◽  
Ju Rui Yang ◽  
Ji Min Hu ◽  
Zhen Ai Lu
Keyword(s):  
Water Quality ◽  
Flow Field ◽  
Concentration Field ◽  
Wetland Plants ◽  
Ecological Environment ◽  
Lake Ecosystem ◽  
Influence Of Water ◽  
Available Information ◽  
Lake Waters

Aiming at the eutrophication state of Dian Lake, based on hydrodynamics principle, and some available information about Dian Lake, such as eco-environmental construction planning, the previous work, and so on, a vertical-averaged 2-D hydrodynamic model of ecosystem is established under combination of wetland plants, bed mud, and water change. The model is applied to simulate flow and concentration fields of present lake water, and lake waters after breakwater removal and wetland build. It is also used to simulate concentration field of wastewater discharged into Dian Lake which meets the discharge standard. The influences of wetland plants and water expanding on flow field and water quality are analyzed, and the effect of wastewater discharged into Dian Lake which meets the discharge standard on water quality is analyzed, too. The results show that: The influence of water expanding on flow field is local; and the influence of wetland plants on flow field occurs primarily at wetland areas; and the influence of water expanding on water quality is not great because the total phosphorus(TP) and the total nitrogen(TN) reduce to 1.69mg/L and 0.16mg/L from 2.08mg/L and 0.19mg/L respectively; and the influence of ecological wetland on water quality is great, because the TP and the TN reduce to 0.76mg/L and 0.05mg/L respectively, which could make the water quality of Dian Lake reach Ⅲ class of The National Surface Water Standards; and the influence of wastewater discharged into Dian Lake which meets the discharge standard on water quality is big, because the TP and the TN reduce to 0.17mg/L and 0.01mg/L respectively, which could obviously improve the water quality. Therefore, wastewater discharged into Dian Lake which meets the discharge standard and artificial wetland play an important role in the improvement of the ecological environment of Dian Lake.

scholarly journals Kualitas Air Situ Lebak Wangi Bogor Berdasarkan Analisa Fisika, Kimia dan Biologi

2017 ◽  
Vol 3 (2) ◽  
pp. 104
Author(s):  
Dewi Elfidasari ◽  
Nita Noriko ◽  
Yunus Effendi ◽  
Riris Lindiawati Puspitasari
Keyword(s):  
Water Quality ◽  
Water Reservoir ◽  
Quality Standard ◽  
Quality Analysis ◽  
Disposal Site ◽  
Physical Chemical ◽  
Groundwater Supply ◽  
Lake Waters

<div class="WordSection1"><p><em>Abstrak</em> - <strong>Situ Lebak Wangi merupakan situ yang berada di daerah Bogor, dan awalnya dimanfaatkan sebagai tempat penampungan air saat musim hujan untuk peningkatkan persediaan  air tanah.  Saat ini, Situ Lebak Wangi dimanfaatkan sebagai tempat pembuangan limbah oleh masyarakat. Hal ini dapat menyebabkan perubahan kualitas baik fisik, kimia dan biologi  perairan situ. Untuk itu perlu dilakukan penelitian terhadap kualitas fisik, kimia dan biologi perairan Situ Lebak Wangi agar diperoleh informasi mengenai kualitas perairannya sehingga dapat disosialisasikan kepada masyarakat di sekitarnya nilai penting konservasi, pengelolaan dan pemanfaatan situ tersebut. Hasil pengukuran sifat fisik dan kimia air menunjukkan bahwa suhu di perairan Situ Lebak Wangi masih memenuhi baku mutu air kelas 1, nilai total padatan terlarut perairan Situ masih di bawah ambang batas baku mutu yang dipersyaratkan, nilai kecerahan di perairan Situ Lebak Wangi berkisar antara 67,17 – 80,83 cm dengan nilai rata-rata 74,46 cm, nilai pH perairan danau lebih rendah dari perairan sungai, yaitu berkisar antara 6,60–8-80. Pengukuran DO menunjukkan bahwa di perairan danau konsumsi oksigennya lebih tinggi, sedangkan hasil BOD5 menunjukkan bahwa perairan Situ Lebak Wangi sudah tercemar oleh bahan organik mudah urai (BOD5). Nilai daya hantar listrik berkisar antara 112,0 – 118,0 µhos/cm. Hasil analisa kualitas air Situ Lebak Wangi secara keseluruhan menunjukkan bahwa perairan tersebut tidak layak untuk dijadikan sebagai air baku, karena mengandung bakteri patogen Salmonella-Shigella yang merupakan penyebab thypus dan kolera. </strong></p><p>                                                          </p><p><strong><em>Keata Kunci </em></strong> - kualitas fisik, kimia dan biologi; Situ Lebak Wangi; Perairan; Baku mutu air</p></div><br clear="all" /><p> </p><p><em>Abstract</em> - <strong>Situ Lebak Wangi is a place located in the Bogor area, and was originally used as a water reservoir during the rainy season to increase groundwater supply. Currently, Situ Lebak Wangi is used as a waste disposal site by the community. This can lead to changes in the quality of both physical, chemical and biological waters there. Therefore, research on the physical, chemical and biological qualities of waters of Situ Lebak Wangi to obtain information about the quality of the waters so that it can be socialized to the community around the importance of conservation, management and utilization of the site. The result of measurement of physical and chemical properties of water shows that the temperature in Situ Lebak Wangi waters still meet the water quality standard class 1, the total dissolved solids of waters Situ is still below the required quality standard threshold, the brightness value in Situ Lebak Wangi waters ranges between 67, 17 - 80.83 cm with an average rating of 74.46 cm, the pH value of the lake waters lower than river waters, which ranged from 6.60-8-80. Measurements of DO indicate that in lake waters oxygen consumption is higher, whereas BOD5 results show that waters Situ Lebak Wangi already contaminated by organic material easily explained (BOD5). The electrical conductivity values range from 112.0 - 118.0 μhos / cm. The result of Situ Lebak Wangi water quality analysis as a whole shows that the water is not feasible to serve as raw water, because it contains Salmonella-Shigella pathogen bacteria which is the cause of thypus and cholera.</strong></p><p><strong> </strong></p><p><strong><em>Keywords</em></strong><strong> - </strong><em>physical quality, chemistry and biology, </em><em>Situ Lebak Wangi, </em><em>Waters, Water quality standards</em><strong><em></em></strong></p>

scholarly journals WATER CLARITY MAPPING IN KERINCI AND TONDANO LAKE WATERS USING LANDSAT 8 DATA

2017 ◽  
Vol 12 (2) ◽  
pp. 117 ◽  
Author(s):  
Bambang Trisakti ◽  
Nana Suwargana ◽  
I Made Parsa
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Atmospheric Correction ◽  
Total Suspended Solid ◽  
Water Clarity ◽  
Suspended Solid ◽  
Lake Ecosystem ◽  
Landsat 8 ◽  
Wide Range ◽  
Lake Waters

Land conversion occurred in the lake catchment area caused the decreasing of water quality in many lakes of Indonesia. According to Lake Ecosystem Management Guidelines from Ministry of Environment, tropic state of lake water is one of parameters for assessing the lake ecosystem status. Tropic state can be indicated by the quantity of nitrogen, phosphorus, chlorophyll, and water clarity. The objective of this research is to develop the water quality algorithm and map the water clarity of lake water using Landsat 8 data. The data were standardized for sun geometry correction and atmospheric correction using Dark Object Subtraction method. In the first step, Total Suspended Solid (TSS) distributions in the lake were calculated using a semi empirical algorithm (Doxaran et al., 2002), which can be applied to a wide range of TSS values. Secchi Disk Transparency (SDT) distributions were calculated using our water clarity algorithm that was obtained from the relationship between TSS and SDT measured directly in the lake waters. The result shows that the water clarity algorithm developed in this research has the determination coefficient that reaches to 0,834. Implementation of the algorithm for Landsat 8 data in 2013 and 2014 showed that the water clarity in Kerinci Lake waters was around 2 m or less, but the water clarity in Tondano Lake waters was around 2 – 3 m. It means that Kerinci Lake waters had lower water clarity than Tondano Lake waters which is consistent with the field measurement results.

Evaluation of Water Quality of Hemren Lake

2013 ◽  
Vol 6 (2) ◽  
pp. 57-76
Author(s):  
SAAD SH. SAMMEN
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Quality Parameters ◽  
Lake Ecosystem ◽  
Index Method ◽  
Weighted Arithmetic ◽  
Canadian Council ◽  
Calcium Magnesium

In this study Water Quality Index (WQI) was applied in Hemren Lake, Diyala province, Iraq using ten water quality parameters (pH, Electrical Conductivity, Hardness, Total Dissolve Soluble, Sodium, Calcium, Magnesium, Potassium, Chloride, Phosphate) from 2008 to 2010 to evaluate the suitability of Hemren Lake ecosystem for drinking and irrigation uses. The Weighted Arithmetic Index method (WAM) and the Canadian Council of Ministers of the Environment Water Quality Index methodology (The CWQI 1.0 model) were used to calculate the water quality index (W.Q.I). The results indicated that drinking water quality of Hemren Lake is good and marginal for the study period according to (WAM) and (CCME) respectively, while the irrigation water quality is good and according to (WAM) and (CCME). It is suggested that monitoring of the lake is necessary for proper management. Application of the WQI is also suggested as a very helpful tool that enables the public and decision makers to evaluate water quality of lakes in Iraq.

scholarly journals Influence of water diversion on spatial and temporal distribution of flow field and total phosphorus (TP) concentration field in Taihu Lake

2020 ◽  
Vol 20 (3) ◽  
pp. 1059-1071 ◽  
Author(s):  
Ruichen Xu ◽  
Yong Pang ◽  
Zhibing Hu ◽  
Tianyi Zhu ◽  
John Paul Kaisam
Keyword(s):  
Flow Field ◽  
Taihu Lake ◽  
Concentration Field ◽  
Temporal Distribution ◽  
Water Diversion ◽  
Lake Area ◽  
Temporal And Spatial Distribution ◽  
Pearson Coefficient ◽  
East Lake ◽  
Influence Of Water

Abstract In order to evaluate the overall impact of water diversion on Taihu Lake, this paper carries out numerical simulation of the temporal and spatial distribution of the flow field and the TP concentration field in Taihu Lake based on measured data during the water diversion period by using the Euler–Lagrange method. The results show that: (1) the Pearson coefficient of monitoring points in the East Lake area increases significantly during the water diversion period, indicating that the diversion of water may indirectly influence water quality; (2) the diversion of water has a significant influence on the flow rate of the simulated stations in Taihu Lake, and the influence is Taipu (103%) &gt; Gongwan (60%) &gt;East Lake (31%); (3) when the amount of water flow transfer from the Wangyu River to the lake is greater than 100 m3/s, the mean concentration of TP in the Center and East lakes increases significantly (more than 50%). The recommended water diversion discharge is to be controlled in the range 100–200 m3/s and the total water diversion yield between 1.56 and 2.59 billion m3/a.

scholarly journals The hydrodynamic and environmental characteristics of tributary bay influenced by backwater jacking and intrusion of main reservoir

2020 ◽  
Author(s):  
Xintong Li ◽  
Bing Liu ◽  
Yuanming Wang ◽  
Yongan Yang ◽  
Ruifeng Liang ◽  
...  
Keyword(s):  
Water Quality ◽  
Flow Field ◽  
Water Level ◽  
Water Environment ◽  
Quality Model ◽  
Environmental Characteristics ◽  
Concentration Boundary ◽  
The Three Gorges ◽  
Regional Boundary

Abstract. The construction of large reservoirs results in the formation of tributary bays, and tributary bays are inevitably influenced by the backwater jacking and intrusion of the main reservoir. The hydrodynamic conditions and the environmental factors of tributary bays exhibit complex distribution characteristics and eutrophication occur frequently. Thus, exploring the distribution and evolution of the hydrodynamic and water environment characteristics of tributary bays in response to backwater jacking and intrusion is the key to solving eutrophication and other problems relevant to water environment. In this paper, a typical tributary bay (Tangxi River) of the Three Gorges Reservoir (TGR) was selected to study the hydrodynamic and environmental characteristics of the tributary bay influenced by the jacking and intrusion of the main reservoir. The flow field, water temperature and water quality of the Tangxi River were simulated using the hydrodynamic and quality model CE-QUAL-W2, and the eutrophication status of the tributary bay was also evaluated. The results showed that the main reservoir had different effects on its tributary bay in each month. The tributary bay was mainly affected by backwater jacking of the main reservoir when the water level dropped and by intrusion of the main reservoir when the water level rose. An obvious quality concentration boundary existed in the tributary bay, which was basically consistent with the regional boundary in the flow field. The flow field and water quality on both sides of the boundary were quite different. The results of this study can help us figure out how the backwater jacking and intrusion of the main reservoir influence the hydrodynamic and water environment characteristics of the tributary bay and provide guidance for water environment protection in the tributary bays.

scholarly journals Pembuatan Sistem Monitoring Temperatur, pH dan Salinitas Tambak Ikan Secara Nirkabel

2019 ◽  
Vol 1 (1) ◽  
pp. 128
Author(s):  
Arfan Eko Fahrudin ◽  
Said Ja'far Shadiq ◽  
Ade Agung Harnawan
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Measurement Instrument ◽  
Quality Parameters ◽  
Microsoft Excel ◽  
Data Measurement ◽  
Conductivity Sensor ◽  
Quality Of Water ◽  
Influence Of Water

− The quality of water hold on important rule in the field of fisheries, especially in cultivation activities. Parameters of water quality are often observed such as temperature, pH, salinity, and others. The influence of water quality on cultivation activity is very important therefore supervision of water quality parameters is absolute done by cultivators. This research  had created the quality of water monitoring system in fishponds wirelessly. The system consist of the transmitter that integrated with LM35 sensor, pH meter kit sensor and conductivity sensor as measurer of water quality, and the receiver receive datum transmitted wirelessly with nRF24L01 module a long 5 meters distance from transmitter. The receiver equipped with an interface with PC which can save data measurement automatically to Microsoft Excel. The results of the validation of the measurement instrument obtained  average of error relative to measurement were 0.01 0C for temperature, 0.005 for pH and 0.008 ppt for salinity. In summary, the measurement of water quality in surface water fishponds of temperature is 29oC until 38oC, pH is 8,6 until 11,9 and salinity is 12 until 21 ppt.

scholarly journals Effects of Water Replenishment from Yellow River on Water Quality of Hengshui Lake Wetland

2018 ◽  
Vol 1 (1) ◽  
pp. 58-62
Author(s):  
Xu Weigang ◽  
Yu Yilei ◽  
Yu Yilei ◽  
Ma Muyuan ◽  
Ma Muyuan ◽  
...  
Keyword(s):  
Water Quality ◽  
Yellow River ◽  
Pollution Index ◽  
Water Diversion ◽  
Ecological Environment ◽  
River Diversion ◽  
Natural Lakes ◽  
Artificial Water ◽  
Lake Wetlands

Hengshui Lake Wetland is the only national wetland and bird nature reserve in the North China Plain. It plays an important role in maintaining the species diversity and ecological balance. In recent years, due to industrial and agricultural production, infrastructure and ecological environment construction and other reasons, the infiltration, runoff, evapotranspiration and other water balance elements was changed, which reduced runoff into the lake. In order to ease the tense water resources situation in the region, Hengshui Lake is replenished each year by Yellow River water. Although Diversion Yellow River Wetland has made direct water supply protection, but also affected the ecology and environment of Hengshui Lake wetlands. In order to understand how artificial water diversion can affect the ecological environment of natural lakes, this paper analyzes the effects of artificial water storage on the water quality of the lake by using the measured data of water samples in the lake. The results showed that the water level of Hengshui Lake showed an upward trend after the diversion from the Yellow River. Comprehensive pollution index showed a downward trend, but Hengshui Lake wetlands are still slightly polluted. Diversion of Yellow River diversion into the lake of the ecological health of Hengshui also caused some impact.

scholarly journals The effect of water transposition on the quality of water in a tropical reservoir, São Paulo – Brazil

2020 ◽  
Vol 1 (50) ◽  
pp. 146
Author(s):  
Regiane Oliveira Conserva ◽  
Regina De Oliveira Moraes Arruda ◽  
Fernanda Dall'Ara Azevedo ◽  
Antonio Roberto Saad ◽  
Edna Ferreira Rosini
Keyword(s):  
Water Quality ◽  
Rio Grande ◽  
Sampling Period ◽  
Tropical Reservoir ◽  
Biological Water ◽  
Quality Of Water ◽  
Influence Of Water ◽  
Water Analyses ◽  
One Year

<p>The aim of the present study is to analyze the influence of water transposition from Rio Grande System on the quality of water in Taiçupeba Reservoir, Suzano city, SP. Water samples were collected every two months for one year (from June 2016 to April 2017) in four sampling spots. Physical, chemical and biological water analyses were carried out; Water Quality and Trophic State indices were also applied. There was influence of water transposition from Rio Grande System on the quality of the water in Taiaçupeba Reservoir throughout the assessed period. The quality of the water was similar in all sampling spots, except for P3, which recorded the worst results. Point 3 was located in an urbanized zone of Taiaçupeba sub-basin; therefore, it is likely that the worse water quality in this spot has resulted from contamination by domestic sewage. It is recommended to carry out further studies based on longer sampling period in the same environment.</p>

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