Page 228 - 《水产学报》2025年第7期

石小涛，等 水产学报, 2025, 49(7): 079517

Design and effect evaluation of tube fishway for
low head dams

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SHI Xiaotao , WANG Nannan , XU Jiawei , LUO Jinmei , LI Dongqing ,
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JI Huaiyao , ZHU Mengna , CHEN Wei , LU Jianyu , KE Senfan 1,2*
1. College of Hydraulic and Environment Engineering, China Three Gorges University, Yichang 443002, China;
2. Hubei International Science and Technology Cooperation Base of Fish Passage,
China Three Gorges University, Yichang 443002, China;
3. Pearl River Water Resources Research Institute, Guangzhou 510635, China;
4. Quality Supervision of Water Conservancy Projects in Santai County, Mianyang 621100, China;
5. Guizhou Wujiang Hydropower Development Co., Ltd., Guiyang 550002, China
Abstract: There is a huge demand for fish passing through low head dams in China, and there is an urgent need to build low-
cost portable fishways without construction. In view of this, this study independently designed a tube fishway to assist fish
migration, analyzed the fish passing effect of Hypophthalmichthys molitrix through portable tube fishways at three tube angles
and two charge conditions, obtained evaluation indicators for the fish passing effect of new tube fishways, and constructed a
risk proportional regression model based on attempt rate, passage rate, and maximum ascent distance to identify the key factors
affecting the fish passing effect of tube fishways. The results showed that: ① The optimal attempt rate model found that charge
is a key factor affecting the attempt of hypophthalmichthys molitrix to enter the fishway; There is a significant negative correla-
tion between charge and ascent migration attempt rate of hypophthalmichthys molitrix in tube fishways. ② The highest pas-
sage rate of the tube fishways can reach 90.5%. Through the optimal passage rate model, it was found that the angle of the tube,
water temperature, and number of attempts are key factors affecting the passage of hypophthalmichthys molitrix through the
fishway; The lowest passage rate occurs when the tube angle is 90°. There is a significant negative correlation between the
number of attempts and the ascent passage rate of hypophthalmichthys molitrix; There is no significant difference in the ascent
passage rate under the conditions of tube angle of 30° and 45°, but both are significantly higher than 90°. ③ The optimal max-
imum ascent distance model found that water temperature and tube angle are key factors affecting the probability of hypoph-
thalmichthys molitrix passing through the maximum ascent distance; there is a significant positive correlation between water
temperature and the probability of the maximum ascent distance that hypophthalmichthys molitrix can pass through; the prob-
ability of the maximum ascent distance that hypophthalmichthys molitrix can pass through is not significantly different under
tube angles of 30° and 45°, but both are significantly higher than 90°.
Key words: Hypophthalmichthys molitrix; portable tube fishway; swimming behavior; low head dam; fish passage effect
Corresponding author: KE Senfan. E-mail: 15926989126@163.com
Funding projects: National Natural Science Foundation of China (52279069); Natural Science Foundation of Hubei Province
(Innovation Group Project) (2023AFA005); Three Gorges The Open Fund Project of the Engineering Research Center of the
Ministry of Education for the Ecological Environment of the Reservoir Area (KF2022-10)

中国水产学会主办 sponsored by China Society of Fisheries https://www.china-fishery.cn
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