Abstract

Carmignani JR, Roy AH, Stolarski JT, Richards T. 2021. Hydrology of annual winter water level drawdown regimes in recreational lakes of Massachusetts, United States. Lake Reserv Manage. 37:339–359.

Annual winter water level drawdown (WD) is a common lake management strategy to maintain recreational value by controlling nuisance macrophytes and preventing ice damage to shoreline infrastructure in lakes of the northeastern United States. The state of Massachusetts provides general guidelines for lake managers to implement and practice WDs. However, WD management reporting is not required and as such empirical water level records are scarce, making it difficult to assess guideline adherence and link these management actions to littoral habitat conditions. We monitored water levels bihourly in 18 lakes with ongoing WD regimes and 3 non-drawdown lakes over 3–4 yr. Our results show an interlake drawdown magnitude gradient of 0.07–2.66 m with intralake consistency across years. Corresponding WD magnitudes generated exposure of 1.3–37.6% for entire lakebeds and 9.2–71.1% for littoral zones. WD durations averaged 171 d and ranged widely from 5 to 246 d. Longer recession and refill phase durations and faster recession rates were moderately to strongly correlated with drawdown magnitudes. WDs were predominantly initiated prior to the state of Massachusetts 1 November starting guideline (83.1%) and refilled to summer reference levels after the recommended date of 1 April (70.6%). To minimize ecological impacts while still meeting recreational goals, WD performance guidelines may require a more fine-scale approach that integrates local hydrogeomorphic features and the presence of WD-sensitive littoral biotic assemblages. However, climate change model projections of warmer and wetter winters in the Northeast indicate increasing uncertainty for WD as an effective and worthwhile macrophyte control tool.

摘要

Carmignani JR、Roy AH、Stolarski JT、Richards T. 2021。美国马萨诸塞州休闲湖泊年度冬季水位下降情况的水文学。湖泊保护区管理。37:339-359。

每年冬季水位下降 (WD) 是一种常见的湖泊管理策略，通过控制有害的大型植物和防止冰对美国东北部湖泊的海岸线基础设施造成破坏来维持娱乐价值。马萨诸塞州为湖泊管理者实施和实践 WD 提供了一般指南。然而，WD 管理报告不是必需的，因此经验水位记录很少，因此很难评估指南的遵守情况并将这些管理行动与沿海栖息地条件联系起来。我们在 3-4 年内每半小时监测 18 个正在进行 WD 制度的湖泊和 3 个非水位下降的湖泊的水位。我们的结果表明，湖间水位下降幅度梯度为 0.07-2.66 m，多年间具有湖内一致性。相应的 WD 震级产生 1.3-37 的暴露。整个湖床为 6%，沿海地区为 9.2-71.1%。WD 持续时间平均为 171 天，范围从 5 到 246 天不等。更长的衰退和补充阶段持续时间以及更快的衰退速率与回撤幅度中度至强相关。WDs 主要在马萨诸塞州 11 月 1 日开始指导方针 (83.1%) 之前启动，并在 4 月 1 日推荐日期 (70.6%) 之后重新填充到夏季参考水平。为了在满足娱乐目标的同时最大限度地减少生态影响，WD 性能指南可能需要一种更精细的方法，该方法整合了当地的水文地貌特征和 WD 敏感的沿海生物组合的存在。然而，