Hydrological characteristics assessment of Jalaur River system and its bottom sediments, Province of Iloilo, Panay Island
摘要
Rivers are important to civilization because river water can be diverted for agricultural irrigation, industry, hygiene, and related uses. Most rivers have varied hydrological characteristics like water depth, flow rate and volume discharges when measured during the wet and dry season. In addition, rivers do carry dissolved minerals and organic compounds. A hydrologic monitoring was done in strategic sampling points along the river to cover the upstream (Banban, Pequeño, Calinog), midstream (Moroboro, Dingle) with sub-points before and after the dam (Imbang Pequeho—near Passi Sugar Central and Licuan, Dingle next to the National Power Corporation) and downstream (Nabitasan, Leganes) sections of the Jalaur River. Sampling was done three times per season (dry and wet seasons) at each of the five sampling sites.
Water level and flow rate variations were observed during the occurrence of a tropical storm and torrential rains brought by a typhoon. Depth ranges from 0.45 meters (dry season) to 6.0 meters (wet season). The river current in the upstream station was greater than the mid and downstream stations at a rate of 2.5, 0.22 and 0.33 m/sec in the wet season and 0.37, 0.2 and 0.08m/sec in the dry season, respectively. River discharges were also higher (108.5, 41.04, and 19.99 m3/sec) during the wet season than in the dry season (3.89, 29.40, and 28.08 m3/sec) for the upper, middle, and downstream stations. Water transparency during the wet season ranged from 5-15 cm whereas 31-55 cm was recorded during the dry season. Color of the water changed from murky brown to brown during the wet season and from clear to light green during the dry months from Calinog down to Leganes except in Imbang, Pequeño-San Enrique site with very undesirable color (black) and odor (ammoniacal) during dry months (milling season). Highest precipitation of 317.24 mm in the wet season and barely 5.2 mm during the dry season was recorded. Bottom sediments were found to be sand to sandy loam, to silty loam from upstream to downstream, respectively. Soil pH was neutral to slightly basic (7.10-8.17). Available phosphorus measurements were higher (11.22-30.50 ppm P) in soils from Calinog to Leganes while the amount of available iron (Fe) increased as the concentration of acetate soluble sulfate decreased, except in Moroboro, Dingle and Nabitasan, Leganes that showed an abnormal increase twice the initial value. The organic matter content of the sediments taken from all sampling sites yielded a wide range of 1.31—4.53 % that decreased to 0.04 from 2.46 % in all sampling sites from wet to dry season. Highest value was in the midstream with values ranging from 4.53—2.46 %.
The results of this study show that sediment agitation by recreational activity and storm surges associated with the drycold season are responsible for the impact on water quality and not recreational users directly. This implies that a follow up study and continuous monitoring is needed to ensure the safety of all end users of the river system, otherwise its use in the future will be limited to quarrying of concreting and embankment materials for civil work projects.
描述
Journal article
Associated Content
Full text of Silliman Journal Volume 51(1), January to June 2010建议引文
Golez, N. V., Borlongan, I. G., & Lorque, F. (2010). Hydrological characteristics assessment of Jalaur River system and its bottom sediments, Province of Iloilo, Panay Island.文件类型
Article國際標準期刊編號
00375284主题
集合
- Journal articles [12]
相關項目
顯示由標題,作者,創造者和主題相關的項目。
-
A study on the invertebrate and vertebrate biodiversity of the Jalaur River system of Iloilo, Panay, Philippines
Alcala, Ely L.; Bucol, Abner; Averia, Leonardo T.; Dusaran, Reynaldo N. (Silliman University, 2010-01)This study, conducted from July to November 2009, aimed to explore the diversity of large aquatic and terrestrial organisms found in microhabitats along the Jalaur River System on Panay Island, Philippines. We adopted a ... -
Socio-economic assessment of the households along the Jalaur River system, Province of Iloilo, Panay Island
Dusaran, Reynaldo N.; Pabulayan, Randy Anthony V. (Silliman University, 2010-01)The socio-economic aspect of the study was conducted to organizational and socio-political involvement, economic activities and use of the river system resources by the dependent population; perceived importance of the ... -
Physico-chemical assessment of the Jalaur River system, Iloilo, Philippines
Borlongan, Ilda G.; Golez, Nelson V.; Lorque, Felizardo (Silliman University, 2010-01)The Jalaur River System was studied for the quality of its water because water quality is a significant and powerful determinant of the health of aquatic ecosystems. This study aimed at investigating the physico-chemical ...