This is the Editorial of the second virtual issue of Irrigation and Drainage. In virtual issues, papers on a specific topic are published together that have already been published in several regular or special issues of our journal since 2000. It is expected that this will enable readers, researchers and practitioners to have an effective overview of the issues at stake with respect to the selected topic.

This second virtual issue is published on the occasion of the stepping down of Professor Emeritus Bart Schultz as Chairman of the Editorial Board, a position he has held since 2002. As incoming Chairman, and on behalf of the Editorial Board, I wish to express our deep gratitude to Professor Bart Schultz for providing unparalleled leadership of the journal for the past 18 years. As Honorary President of the International Commission of Irrigation and Drainage (ICID), Bart has contributed greatly to the community's administration. His research during this period has also been impressive and productive. In this issue you will find papers of which he was the sole author or one of the lead authors. The papers basically focus on two topics: (i) water management for food production; (ii) the role of water management and flood protection for those living and working in flood‐prone deltaic and coastal areas. This virtual issue is composed of 14 papers and a list with other papers for Irrigation and Drainage or ICID events of which he was the author or co‐author. The papers are presented in chronological order.

As far as the first topic is concerned, the development and management of irrigation, drainage and flood protection schemes are confronted with rapidly changing conditions, especially in least developed and emerging countries. Issues at stake are the need to significantly increase food production, the greater occurrence of water shortages, pollution of water resources, the increased requirement for flood management and flood protection schemes, the need for sustainable development and possible impacts of climate change.

In respect of the second topic, Bart has described how the reclamation, development and management of flood‐prone areas require an integrated approach in which various relevant aspects need to be taken into account. Two of the most important aspects of this approach are the design standards for drainage and flood protection provisions, and land subsidence. With respect to flood protection provisions, it is important that in quite some of the reclaimed coastal and deltaic areas there is rapid urbanization taking place. There may be different reasons for the land subsidence, such as compaction of soft layers, oxidation of peat soils, or tectonic movement. In extreme cases the land subsidence may be even more than 200 mm yr‾¹. The combination of these two aspects requires due attention in order to prevent, or at least reduce as much as possible, calamities in these sensitive flood‐ prone areas.

I hope that in this virtual issue you will find interesting information that can be of benefit to you in your research and practice.

这是《灌溉与排水》第二期虚拟社论的社论。在虚拟期刊中，有关特定主题的论文被一起发表，自2000年以来，这些期刊已在我们期刊的若干常规或特殊期刊上发表。希望这将使读者，研究人员和从业人员能够有效地了解这些问题。与所选主题相关的股份。

第二期虚拟刊物是在名誉退休的巴特·舒尔茨教授卸任编辑委员会主席之际发表的，他自2002年以来一直担任该职位。作为新任主席，我谨代表编辑委员会表达我们的观点。感谢巴特·舒尔茨（Bart Schultz）教授在过去18年中提供了无与伦比的领导力。作为国际灌溉与排水委员会（ICID）的名誉会长，巴特为社区的行政管理做出了巨大贡献。在此期间，他的研究令人印象深刻且富有成果。在本期中，您将找到他是唯一作者或主要作者之一的论文。这些文件基本上集中在两个主题上：（i）粮食生产用水管理；（ii）水管理和防洪对在容易发生洪灾的三角洲和沿海地区生活和工作的人们的作用。这个虚拟问题由14篇论文和一份其他论文组成他是作者或合著者的灌溉和排水或ICID事件。论文按时间顺序排列。

就第一个主题而言，灌溉，排水和防洪计划的发展和管理面临着迅速变化的条件，特别是在最不发达国家和新兴国家。面临的问题是需要大幅度增加粮食产量，出现更多的水短缺，水资源污染，对洪水管理和防洪计划的需求增加，对可持续发展的需求以及气候变化的可能影响。

关于第二个主题，巴特描述了洪水多发地区的填海，开发和管理如何需要一种综合方法，其中需要考虑各个相关方面。该方法最重要的两个方面是排水和防洪规定的设计标准以及地面沉降。关于防洪规定，重要的是在相当一部分开垦的沿海和三角洲地区，城市化正在迅速发生。地面沉降可能有不同的原因，例如软层的压实，泥炭土的氧化或构造运动。在极端情况下，地面沉降可能甚至超过200毫米yr -1。这两个方面的结合需要引起注意，以防止或至少尽可能减少

我希望在这个虚拟问题中，您会发现有趣的信息，这些信息可以对您的研究和实践有所帮助。