美工圖片   Investigation of stream status of Bei-gang River (The 5th River Management Office, WRA, MOEA. June, 2007)

 

Hydraulic facility for water control and priority has been more concentrated on the stream development and management work in the early Taiwan but the integral environmental ecology is taken less consideration. For the sake of promotion of the stream enterprise、management、habitat environmental protection and restoration and providing the hydraulic engineering units (HEU) with the reference and basis on eco-engineering planning and design, the 5th River Management Office (RMO), Water Resources Agency (WRA), Ministry of Economic Affairs (MOEA) has studied the investigation project on the relevant basic data, including the stream situation investigation on human and culture、geology、hydrology data、biology and space use, etc. , in the tributaries of the Pei Kang Chi basin. The main (i.e. Pei Kang Chi) and tributaries (i.e. Hu Wei Chi、San Tieh Chi and Shih Liou Ban Chi) are to be investigated in this project and the Geography Information System (GIS) ecological data base system via unit of the stream in the Pei Kang Chi basin is to be accomplished according to the collect and survey data.

The items and contents of the river situation investigation include:I. The stream physical survey (including the stream outline、 watershed overview、 discharge and water quality、 stream pattern and so on);II. the ecological survey (including fish、 shrimp & crab、 plant 、birds、 amphibian、reptile 、mammal and terrestrial insects, etc.);III. the stream space use situation (including high land and stream use situation, etc.);IV. the ecological resources data base establishment, in order to provide the HEU with the referral and fundamental of ecological engineering planning and design.

Pei Kang Chi comes from the Ci Sing Ling (elevation 516 m), Lin Nei Township in the west foot of the A Li Shan Mountain, Hu Wei Chi is so called in its upstream of Hai Fong Lun, Ba De Village, Dou Liou City, Yun Lin County, the stream is called as Pei Kang Chi under the Ping He Bridge of Hu Wei Township, it flows into the sea in the Hu Kou Village, Kou Hu Township, Yun Lin County, finally. This basin is across Yun Lin and Chia Yi both counties, adjacent to the Hu Wei Chi and Hsin Hu Wei Chi Basins in the north、Sin Gang seashore and Po Tzu Chi basins in the south and the Cing Shuei Chi (i.e. the branch of Cho Shui Chi) in the east, respectively.

北港溪流域(美工用)

Palm-like Branch and valley mostly exist in the upstream of this basin, merged with the Pei Kang Chi along it, meandering in the southwest. At the estuary section, Niao Song and Jian Shan, etc. drainages flow into it from the north and at the Tai Zih Village, Kou Hu Township, Yun Lin County or so, it flows into the Taiwan Strait. Total length of the Pei Kang Chi is about 82 kilometers and its basin area is 645.2 km2 or so. Its 20% area about 129 km2 belongs to mountain part mainly with elevation between 100 and 270 meters and the rest 80% is plain with its area 516 km2 or so.

It’s indicated via the result of stream habitat survey that the channel from the estuary to the Hu Wei Chi Bridge belongs to the main part in the Pei Kang Chi, located on the border between Chia Yi and Yun Lin counties across the seashore townships in both counties; the channel in its downstream belongs to the meandering-type stream with milder slope and sandy and gravel bed. The channel in the tributary-Hu Wei Chi from Pin He Bridge to Taiwan Railway Administration (TRA) Railroad Bridge, passing through Dou Nan and Dou Liou Cities, belongs to urban-type stream、milder slope and the gravel bed.The tributary-Shih Liou Ban Chi exists in the upstream of the Hu Wei Chi and its degree of natural vegetation is higher, there is industry sewage flowing into the Dou Liou Industry Park nearby, its bed components are mainly composed of sand、small and large gravels; The flowing type chiefly consists of shallow flow、deep flow and pool. The channel of the tributary-San Tieh Chi is from the convergence of San Tieh Chi and Pei Kang Chi to the Tian Liao Bridge, passing through Si Kou、Min Syong、Da Lin、Jhu Ci and Mei Shan 5 Townships in Chia Yi County and belongs to the mountain-type stream、steeper slope and gravel bed.

 

Stream space use situation survey via channel section can be classified as:I. The area in the downstream of Pei Kang Chi (Estuary to Pei Kang Bridge)-high land use around the estuary mainly belongs to the area of cultivation fishery, it above Song Shan Bridge consists majorly of agriculture and its crops are composed of rice、sugar cane、sweet potato and peanut, etc.. The area in the middle and upstream of Pei Kang Chi (Pei Kang Bridge to Ping He Bridge)-high land use around the estuary consists mainly of agriculture and its crops belongs to rice、sugar cane、sweet potato and peanut, etc.. The channel section in Hu Wei Chi and Shih Liou Ban Chi (Ping He Bridge to Shih Liou Ban Bridge)-is mostly composed of urban area along it, part area of high land chiefly belongs to rice、sugar cane and orchard agriculture and there are duck farms around Hu Wei Chi Bridge. The channel for San Tieh Chi tributary (San Tieh Chi Convergence to Tien Liao Bridge)-high land use belongs to rice crop near San Tieh Chi Convergence to San Tieh Chi Bridge and consists of planting areca (betel palm) and bamboo above San Tieh Chi Bridge.

Survey on the part of man-made use for the main of Pei Kang Chi in this project results in almost nil activity in its middle and downstream, i.e. no people’s utilization for all amenity/ hydrophilic facilities but mainly farmer’s crop cultivation except few people’s activities for going fishing; people show up in the embankment for bird observation activity in its estuary. In addition to Chao Tian Gong Temple near the Pei Kang Bridge famous for worship, lots of tourists visit here on vacation and religion festival in its mid-stream; Pei Kang Touring Bridge, one of important points of sight-seeing, also exists nearby .

According to long-term monitoring data on the part of steam quality from the Environmental Protection Administration (EPA), its main and tributary-Hu Wei Chi in Pei Kang Chi belong to serious and medium pollution except medium and light pollution existing above Shih Liou Ban Bridge. The tributary-San Tieh Chi and channel between Pei Kang Chi Convergence and San Tieh Chi Bridge belong to medium pollution but light pollution exists above San Tieh Chi Bridge.

SUNSET, HUKOU WETLAND
SUNSET, HUKOU WETLAND

CHAOTIEN TEMPLE AT PEIKANG
CHAOTIEN TEMPLE AT PEIKANG

The aquatic fauna (including fish、shrimp and crab、spiral shell and shell、aquatic insect and algae)、 terrestrial fauna (including bird、 mammal、reptile、amphibian、 butterfly and dragonfly) and plant community have been investigated on ecological survey in the main- Pei Kang Chi and its tributary-San Tieh Chi for 1 year in this project. For bird, it’s been surveyed during breeding and non breeding seasons; terrestrial plant survey has been carried out for one time. Survey and data collection on 5 fixed and 14 random sample sites in the main and 2 fixed and 2 random sample sites in its tributary have been finished, respectively.

The aquatic ecological survey in the main-Pei Kang Chi results in 6 orders、15 families and 20 species of fish; 5 families and 10 species of shrimps and crabs; 9 classes、14 families and 15 species of spiral shells and shells for the benthic organism and 4 orders、49 families and 79 species of adhesive algae, respectively. Total records include 5 orders、10 families and 15 species of fish; 3 families and 4 species of shrimps and crabs; 8 classes、13 families and 14 species of spiral shells and shells for the benthic organism and 4 orders、40 families and 63 species of algae, respectively in the tributary-San Tieh Chi.

The terrestrial ecological survey in the main Pei Kang Chi results in 10 orders、 28 families, and 51 species of birds; 4 orders、 6 families and 10 species of mammals; 2 orders、 7 families and 14 species of reptiles; 4 families and 5 species of amphibians; 6 families and 21 species of butterflies; 3 families and 7 species of dragonflies, respectively. Total records include 12 orders、 30 families, and 46 species of birds; 4 orders、 6 families and 8 species of mammals; 2 orders、 7 families and 15 species of reptiles;2 orders、 7 families and 15 species of amphibians; 6 families and 21 species of butterflies; 1 orders、 6 families and 19 species of butterflies and 1 orders、 4 families and 11 species of dragonflies, respectively in the tributary-San Tieh Chi.

As a whole, biological resources in the environment are not abundant and appearing cases of species in the middle and upstream are all sparer, except more species records in the upstream sample sites. Among the found species, It is worth studying and paying attention to the serious invasion of the exotic fish (e.g., Pterygoplichthys) in most of survey sample sites and this will impact native species directly or indirectly.
 

Spilornis cheela

Bungarus multicinctus multicinctus

Anguilla marmorata

Spilornis cheela

Bungarus multicinctus multicinctus

Anguilla marmorata