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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Earth and Space Sciences · 术语表

什么是 Flow net？

Definition 23.9 University Earth and Space Sciences — Year 3 · 第 23 章 — Hydrogeology

A flow net is a drawing of steady groundwater flow in a homogeneous, isotropic section by two families of curves: equipotentials, lines of equal head, and streamlines, which the water follows. The streamlines cross the equipotentials at right angles, and in a flow net they are spaced so that the cells are curvilinear squares.

Seepage under a dam 20\, m wide on a layer of sand 20\, m thick, the reservoir 10\, m above the water downstream, computed by solving Laplace’s equation for the head and for the stream function. Thin lines: equipotentials, one every metre of head. Thick lines: four streamlines which, with the dam base and the floor, bound five flow channels. The computed seepage is 0.51\,KH per metre of dam; the flow net gives KH × 5/10 = 0.50\,KH. — Seepage under a dam $20\,\mathrm{m}$ wide on a layer of sand $20\,\mathrm{m}$ thick, the reservoir $10\,\mathrm{m}$ above the water downstream, computed by solving Laplace’s equation for the head and for the stream function. Thin lines: equipotentials, one every metre of head. Thick lines: four streamlines which, with the dam base and the floor, bound five flow channels. The computed seepage is $0.51\,KH$ per metre of dam; the flow net gives $KH \times 5/10 = 0.50\,KH$ .

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