Can the combining of wetlands with reservoir operation largely reduce the risk of future flood and droughts?
Abstract. Wetlands and reservoirs are important water flow and storage regulators in a river basin; therefore, they can play a crucial role in mitigating flood and hydrological drought risks. Despite the advancement of river basin theory and modeling, our knowledge is still limited about the extent that these two regulators could have in performing such a role, especially under future climate extremes. To improve our understanding, we first developed a framework coupling wetlands and reservoir operations with a semi-spatially explicit hydrological model and then applied it in a case study involving a large river basin in Northeast China. The projection of future floods and hydrological droughts was performed using this framework during different periods (near-future: 2026–2050, mid-century: 2051–2075, and end-century: 2076–2100) under five future climate change scenarios. We found that the risk of future floods and hydrological droughts can vary across different periods, in particular, will experience relatively large increases and slight decreases. This large river basin will experience longer duration, larger peak flows and volume, and enhanced flashiness flood events than the historical period. Simultaneously, the hydrological droughts will be much more frequent with longer duration and more serious deficit. Therefore, the risk of floods and droughts will overall increase further under future climate change even under the combined influence of reservoirs and wetlands. These findings highlight the hydrological regulation function of wetlands and reservoirs and attest that the combining of wetlands with reservoir operation cannot fully eliminate the increasing future flood and drought risks. To improve a river basin’s resilience to the risks under future climate change, we argue that implementation of wetland restoration and development of accurate forecasting systems for effective reservoir operation are of great importance. Furthermore, this study demonstrated a wetland-reservoir integrated modeling and assessment framework that is conducive to risk assessment of floods and hydrological droughts, which can be used for other river basins in the world.
Yanfeng Wu et al.
Status: final response (author comments only)
RC1: 'Comment on egusphere-2022-1103', Anonymous Referee #1, 03 Dec 2022
- AC1: 'Reply on RC1', Guangxin Zhang, 05 Jan 2023
- AC4: 'Reply on RC1', Guangxin Zhang, 19 Feb 2023
RC2: 'Comment on egusphere-2022-1103', Anonymous Referee #2, 27 Dec 2022
- AC2: 'Reply on RC2', Guangxin Zhang, 05 Jan 2023
- AC5: 'Reply on RC2', Guangxin Zhang, 19 Feb 2023
RC3: 'Comment on egusphere-2022-1103', Anonymous Referee #3, 09 Jan 2023
- AC3: 'Reply on RC3', Guangxin Zhang, 15 Feb 2023
Yanfeng Wu et al.
Yanfeng Wu et al.
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“Can the combining of wetlands with reservoir operation largely reduce the risk of future flood and droughts?” presents an original study aiming at discussing whether the combining of wetlands with reservoir operation can largely reduce the risk of future floods and droughts in the Nenjiang River Basin. The data of this paper is very comprehensive and the method is reasonable. The results are helpful for understanding the role of wetlands and reservoir operation in mitigating basin hydrological risks under climate change, which make this manuscript worth publishing. I recommend to accept this manuscript after minor revisions to address following general and specific comments.
Line 40 and 718. Diffenbaugh et al., 2015a and Diffenbaugh et al., 2015b are the same paper.
Lines 42-43. Please cite the references in the main text correctly. Move “Güneralp et al., 2015” to the end of the sentence.
Lines 45-46. Suggest to say global scale first and then regional scale.
Line 64. Inert “However” before unlike.
Line 132. Delete “and storage”.
Line 137. Insert then after “We”.
Line 146. Insert hydrological after “future”.
Line 158-159. Three wetlands of international importance do not represent much. Please rewrite.
Line 160. What’s the contributing drainage areas of wetlands?
Line 163-164. Songnun Plain or Songnen Plain? Please be consistent with Figure 1.
Line 168. Revise “significantly” to largely.
Line 228-229. What are the two wetland modules. Please specify here.
Line 231. The reference format is incorrect.
Line 242. I still haven't seen a definition of contributing areas here.
Line 257. Kinematic wave equation, loss reference here.
Line 274. What is the time-step length in this study?
Lines 272-274, 277-279. Loss of units for formular parameters.