Trend Analysis of Monthly Water Quality Data in Nakdong River Based on Seasonal Mann-Kendall Test (original) (raw)

Seasonal Variation of Phytoplankton Community in the Naktong River

ALGAE, 2002

A seasonal variation of phytoplankton community in the Naktong River was studied in seven sampling stations at monthly intervals from April 2000 to March 2001. Environmental factors such as conductivity, total phosphorus, total nitrogen and BOD were much higher at a lower reaches than the upper reaches. Especially, they rapidly increased at the st. 4 located near the discharge of the Kumho River. Total 239 taxa observed in the study were classified into 201 species, 22 varieties, 2 forma, 1 morphotype and 13 unidentified species belonging to 102 genera, 39 families, 17 orders and 8 classes. The phytoplankton standing crops were recorded a maximum of 33,389 cells • ml-1 at the st. 7 in June and a minimum of 139 cells • ml-1 at the st. 1 in September. The correlations between averages of the phytoplankton standing crops and some of environmental factors were investigated at each sampling station. The coefficients of correlation between average of the phytoplankton standing crops and BOD, T-N and T-P were 0.61, 0.45 and 0.47, respectively. In general the dominant species were Achnanthes minutissima Kütz, Nitzschia fonticola Grun., Navicula cryptotenella Lange-B in the upper reaches, Microcystis aeruginosa (Kütz.) Kütz. and Stephanodiscus hantzschii Grun. in the lower reaches.

Analysis of climate change impact on flow duration characteristics in the Mekong River

Journal of Korea Water Resources Association, 2019

The purpose of this study is to analyze the Mekong River streamflow alteration due to climate change. The future climate change scenarios were produced by bias corrections of the data from East Asia RCP 4.5 and 8.5 scenarios, given by HadGEM3-RA. Then, SWAT model was used for discharge simulation of the Kratie, the main point of the Mekong River (watershed area: 646,000 km2 , 88% of the annual average flow rate of the Mekong River). As a result of the climate change analysis, the annual precipitation of the Kratie upper-watershed increase in both scenarios compared to the baseline yearly average precipitation. The monthly precipitation increase is relatively large from June to November. In particular, precipitation fluctuated greatly in the RCP 8.5 rather than RCP 4.5. Monthly average maximum and minimum temperature are predicted to be increased in both scenarios. As well as precipitation, the temperature increase in RCP 8.5 scenarios was found to be more significant than RCP 4.5. I...

강화도 남단 조간대에 도래하는 마도요류의 환경수용능력 예측

Journal of Wetlands Research, 2013

In this study we estimated the carrying capacity of the southern intertidal zone of Kanghwa Island to evaluate the habitat quality for Curlews(Far Eastern Curlew Numenius madagascariensis and Eurasian Curlew Numenius arquata). Biomass of the macroinvertebrate(Macrophthalmus japonicus) was estimated by based on the spatial distribution of the sediment grain size using GIS tools. According to our analysis the southern intertidal zone of Kanghwa Island was able to support 11,767 individuals for 153 days in the Spring 2012 and 16,275 individuals for 122 days in the Autumn 2012. The proportion of mean population to the carrying capacity in the Spring and Autumn was 9.4% and 5.9%, respectively. These values are 2.8-6.3% smaller than those of the previous study held in 1993-94. For the conservation of the study area, more research and management is needed. And in further studies, diverse characteristics of the intertidal habitat should be considered in spatial analysis to have a precise estimate of the carrying capacity.

Assessment of Water Resources Vulnerability Index by Nation

Journal of Korea Water Resources Association, 2014

Discussions for water resources vulnerability and index development with sustainable concept are actively being made in recent years. Based on such index, water resources vulnerability of present and future is determined and diagnosed. This study calculated the water resources vulnerability rankings by 152 nations, using indicator related to water resources assessment that can be obtained from World Bank, VRI (Vulnerability Resilience Indicator), ESI (Environmental Sustainability Index). In order to quantitatively assess of water resources vulnerability based on this indicator, TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) technique was applied to index water vulnerability and to determine the rankings by nations. As a results, South Korea was ranked as the 88th among the 152 nations including Korea. Among the continents, Oceania was the least vulnerable and Afirica was the most vulnerable in continents. WUnited State, Japan, Korea and China were vulnerable in order among the major countries. Therefore, water resources vulnerability rankings by nations in this study helps us to better understand the situation of South Korea and provide the data for water resources planning and measure.

Estimation of Groundwater Level Fluctuation of the Crystalline site Using Time Series Analyses in South Korea

2013

This study is characterized the groundwater flow pattern near crystalline site of Yangbook-Myeon, Gyeongju City, South Korea. From the time series analyses, groundwater level could be classified into 4 types reflecting the hydrogeological characteristics and rainfall pattern. The type Ⅰ (DB1-1, DB1-2) may be directly influenced by rainfall pattern. The type Ⅱ (DB1-3, DB1-7, KB-1, KB-2, KB-3, KB-7, KB-14, KB-15) may be influenced by rainfall event as well as groundwater flow through water-conducting features. The type Ⅲ (DB-5, DB1-6, DB2-2, KB-10, KB-11, KB-13) may be predominantly happens in the crystaline rock mass, groundwater in this type flows through the minor fracture networks rather than direct effect of rainfall event. The type Ⅳ (DB1-8, KB-9) may be influenced by irregular variation of the groundwater level due to anisotropy and heterogeneity of crystalline rock.

Regional Cooperation by the 1st Asia-Pacific Water Summit and Water Network

2008

요 지 지난 수십 년 동안 아시아태평양 지역 각국은 수자원 접근성 및 인프라의 확충을 포함한 물관리의 다 , 양한 측면에서 현저히 발전하였다고 평가되고 있다 그러나 급속한 인구 증가 및 경제 성장 도시화 기존 수 . , , 자원의 고갈 등은 아태 지역의 물 수요가 여전히 충족시키지 못하는 원인이다 또한 기후변화로 인한 환경적 . 변화를 고려하여 모든 수자원정책의 입안 및 계획이 이루어져야 한다 경제적 성장률은 전반적으로 높았지만 . 빈곤 문제는 역시 도시나 농촌을 구분할 것 없이 만성적인 문제로 남아 있으며 아태 지역 개도국 인구의 , 가 영양실조 상태이며 년까지 그 수를 반감하자는 밀레니엄 개발목표 16% , 2015 (Millenium Development 달성은 아직 갈 길이 멀다 또한 아태 지역은 물 관련 재해에 대해 전 세계에서 가장 취약한 Goals, MDGs) . 지역이며 그로 인한 지속가능한 발전이 지체되고 있다 년부터 년까지 물 관련 재해로 인한 전 세계 . 196

Performance Evaluation Method by Type of Domestic Water Pipeline

The Society of Convergence Knowledge Transactions, 2019

In order to effectively control the leakage occurring in the water supply pipeline, it is necessary to accurately grasp the pipeline performance and set a management goal appropriate to the situation. In this study, the types of pipelines were classified in consideration of local government financial status, and the pipeline performance of each type were evaluated using domestic and overseas performance indicators. As an indicator for classifying pipeline types, billed metered consumption that was most correlated with the population density (water population per length of distribution and service pip) was selected as the types of pipeline classification criterion. The billed metered consumption standards for dividing pipelines into three phases were set at 10 ML/km/year and 30 ML/km/year. The 161 local governments in Korea were classified as Type-I (33 local governments), Type-II (54 local governments), and Type-III (74 local governments). The water pipelines in the surveyed area (161 local governments) were divided by type and evaluated by ILI and revenue water rate indicators. The average ILI and revenue water rate of Type-I, which represent large cities and planned cities, are 4.0% and 88.9%, respectively, which shows that the pipline performance of Type-I is better than Type-II and III. The ILI value of Type-II is the highest (10.4), and it is urgent to prepare countermeasures by supporting pipeline improvement projects that are the same as Type-III.